zoo

Thinking

Let's start by understanding the situation. I'm "greg", a senior developer/architect. A review was submitted on PR #69 (my PR, branch issue-68-greg). The reviewer (abrander) said the following: "I think you're right. It matches per file - that's not what the agent expects. Can we fix that somehow?" So the problem is: `--max-count=N` is per-file, but the agent (the LLM agent that calls the `grep_search` tool) expects `max_results` to be a global cap on the number of matching lines. The reviewer is asking for a fix that makes it a global cap. Let me look at the current code and think about how to implement a global cap. Approach: 1. Keep `--max-count=N` per-file as a pre-filter (to avoid reading huge files / huge output). 2. Post-process in Go: count matching lines (lines that don't end with `:`, i.e., actual matches vs. context lines and separators), and stop when the total reaches N. Wait, but how do we distinguish matching lines from context lines in grep's output? With `-A`/`-B` and `--max-count`, the output format is: ``` file:line:content file-line-content (context line, no colon after the line number) -- file:line:content ``` Context lines have the format `file-line-content` (hyphen instead of colon), and the separator is `--`. Matching lines have the format `file:line:content`. Actually, with multiple files, the format is `path:line:content` for matches and `path-line-content` for context. So we can count lines matching `^.*:\d+:` as matching lines... but wait, the file path itself might contain a colon. Hmm, that's a corner case. A more robust approach: context lines start with the file path followed by a hyphen, and match lines have a colon before the line number. A line like `--` is a separator. A more robust alternative approach: use grep's `-m N` (same as --max-count) per file, then in Go parse the output and count matches. For counting, we can use the fact that in multi-file mode, matching lines match the regex `^(.+):([0-9]+):(.*)$`... but the path can contain `:`. Hmm. Actually, a cleaner approach: use grep's `--line-number` (default) and check whether the line matches `^.*:[0-9]+:` — the line number is digits followed by a colon. Context lines are `path-line-content`, where the line number part is also digits, but followed by a hyphen. So the distinguishing feature is: the character immediately after the digits is `:` (match) vs. `-` (context) vs. the line being exactly `--` (separator). So in Go: for each output line, if the line is `--`, it's a separator. Otherwise, find the last `:` followed by digits... hmm, tricky. Let me think: format is `path:LINENUM:content`. Path can contain colons (rare but possible). LINENUM is digits. Content can contain anything. To robustly identify matching lines: the line must contain `:<digits>:` where the digits are the line number. But content can also contain `:123:`. Hmm. Alternative: use a different strategy entirely. Instead of parsing grep's output format, we can do the capping in a different way: Option A: Run grep without `-m`, but stream the output and stop when we've seen N matching lines. But we don't know which lines are matches without parsing. Option B: Use grep's `-c` (count) per file to know how many matches each file has, and... no, that doesn't give us the actual lines. Option C: Two-pass: first, find which files have matches (with counts), then run grep with a per-file `--max-count` adjusted so that the total ≤ N. E.g., first pass: `grep -r ... -c pattern` to get per-file counts. Then compute a budget: for each file in order, allocate min(count, remaining) matches. But grep doesn't support a different -m per file in a single invocation. We could run grep per file with `-m k` for each file. That's a lot of process spawns, but it's robust. Hmm, but the tool currently runs a single grep command. Option D: Parse the output in Go. Honestly, parsing is feasible: in multi-file mode (or even single-file mode? — in single-file mode without -H, the prefix is just `LINENUM:content`), the structure is: - Match line: `path:line:content` (or `line:content` in single-file mode) - Context line: `path-line-content` (or `line-content` in single-file mode) - Separator: `--` Distinguishing match vs. context: look for the first occurrence of `:<digits>:` — for a match line, the line number field is right after the path. The path comes from the filesystem, and the content is arbitrary. Hmm, wait — actually there's a simpler, more robust trick: use `--max-count` per file as a soft cap (e.g., N or a reasonable value), then count matches in Go by counting lines that are neither `--` nor context lines. To identify context lines: they start with the file path + `-`. We know the file path (we can get it from the match lines). But the first line might be a context line (when using -B, the first line of the file's output is a context line before the first match). Let me think about a regex approach: a match line matches `^(?P<path>.+):(?P<line>\d+):(?P<content>.*)$`, and the path should be a path we know about... in recursive mode, we don't know all the paths in advance. Alternative robust approach: run grep with `-m N` per file, and post-process: count matching lines by counting lines that don't match the context pattern. Context lines: `path-line-content`. The key difference: in a match line, the line number is followed by a colon; in a context line, it's followed by a hyphen. A regex that identifies match lines: `^.*:\d+:` — but the content of a context line could contain `:123:`... e.g., a context line `foo.c-42:int x = 1; // see line:123: stuff` — this would match `^.*:\d+:`. Ugh. Better way: use the fact that the line number is at a specific position: after the path. The path is everything up to the last `:` before the line number... no wait, the path is up to the first `:` that starts the line number, and the line number is digits followed by a colon. Honestly, the cleanest and most robust solution is: **do the counting in Go, and run grep per file with a computed per-file cap**. Plan: 1. First pass: `grep -r -l` (files with matches) or better `grep -c` to get per-file match counts. Actually, `grep -rc pattern` outputs `path:count` for each file (with -r, all files including zero-count ones? With -c, files with no matches are output with 0? Actually, with -r and -c, grep outputs `path:0` for files with no matches. Let me recall: `grep -rc foo .` outputs `./file:0` for files without matches. Yes, -c outputs a count for every file examined, including 0.) Hmm wait, but the tool also supports other flags like glob filters, case sensitivity, context, etc. Let me first look at the actual code. Let me check the repository. Actually, let me think about what the "agent" expects: `max_results` = "maximum number of matching lines to return (default: 100)". The agent expects a global cap on the number of matching lines returned. So the fix: ensure the total number of matching lines across all files ≤ N. The simplest and most robust implementation: - Run grep with `-m N` per file (so no file contributes more than N matches — a safe upper bound). - Stream the output; count matching lines; stop processing (and truncate output) once the total reaches N. To count matching lines without fragile parsing... hmm. Alternative: use `grep -o`? No, that changes the output. Alternative: use grep's `--count-objects`? No. What about using a different tool for counting? We could run grep twice: 1. `grep -rn pattern` with `--max-count=N` per file → get the candidate output (at most N matches per file). 2. Count matches in the output... still needs parsing. OK, another thought: what if we use `grep -rn pattern -m N` and then count lines in Go that are "match lines" by a reliable method: **run a second grep pass with `-o` and `-c` on the same output?** No, the output has context lines that could also contain the pattern (context lines are lines near matches, and they might also contain the pattern themselves — in which case grep would have reported them as matches anyway... actually, if a context line contains the pattern, grep reports it as its own match, and the context is merged. So in grep's output, all lines containing the pattern are match lines, and no context line contains the pattern... wait, is that right? With -A/-B, context lines are lines adjacent to matches. If a line within the context range also matches the pattern, it becomes a match itself. So yes: in grep's output, a line is a context line if and only if it does not contain the pattern. Hmm, but with case-insensitive or regex patterns, "contains the pattern" means "matches the pattern". So: we could count matches by running `grep -c pattern` on the captured output? But the output lines have prefixes (path:line:), which would change whether the pattern matches. E.g., pattern `foo` matches content `foo` — the prefixed line `path:12:foo` still contains `foo`. But a pattern anchored at `^foo` would not match `path:12:foo`. So this is also fragile. OK, let me step back. The cleanest, most robust approach that avoids parsing grep's output format entirely: **Per-file execution with a budget:** 1. First pass: `grep -rl` (or `-c`) to enumerate files with matches and per-file counts. 2. Walk files in deterministic order; maintain a remaining budget B (initial value N). For each file, run grep on that single file with `-m min(count, B)` and the context flags. Append the output. Decrement B by the number of matches actually returned (min(count, B)). Stop when B reaches 0. This is fully robust: no output parsing needed, exact global cap. Downside: multiple process spawns (one per file with matches, up to the point the budget runs out). For a typical search (a few files), that's fine. In the worst case (a pattern matching 1000 files, N=100), that's 100+ spawns — still fine for a dev tool. But wait — there's a subtlety with the first pass: `grep -rc` gives per-file counts, but the order of files in the output is filesystem order, which might differ from the order of the second pass. We need a deterministic order; we can sort the file list. The original single-grep approach also had filesystem order, so sorting is fine (arguably better). Hmm, but wait. Isn't there a simpler approach that the reviewer would accept? Let me re-read the review: "I think you're right. It matches per file - that's not what the agent expects. Can we fix that somehow?" So they're asking for a global cap. The PR's "Note" section said: "If a strict global cap is ever needed, it would need to be post-processed in Go rather than a shell flag." The reviewer is essentially saying: yes, do that. So the fix: post-process in Go to enforce a global cap. Now, how to post-process robustly? Let me think again about parsing. Actually, let me reconsider: is parsing really that fragile? In multi-file mode (which is the case with -r, and also with -H), each output line is one of: - Match: `path:lineno:content` - Context: `path-lineno-content` - Separator: `--` The path is the path as grep was invoked (relative or absolute, as given). In recursive mode, paths start with the directory argument (e.g., `./src/foo.go`). To distinguish match vs. context: find the position of `:lineno:`. The path can contain `:` (rare on Linux), and the content can contain `:digits:` (possible). But here's the thing: we can identify the path prefix! In recursive mode, all paths start with the search root (e.g., `./`). And the separator between the path and the line number is the first `:` after the root prefix... no wait, the path can contain colons. Alternative: use `grep -H` with a custom... hmm. What about using a NUL-separated format? `grep --null`? No, that's for -l/-L. What about `--format`? That's for -l. Hmm, what about using `grep -rn` and then counting matches with a second grep invocation on the raw file? No. OK, yet another approach — **let grep do the global counting for us**: Run `grep -rn pattern` (no -m) and stream the output line by line in Go. For each line, determine if it's a match line (needs parsing...). Argh, same problem. Let me think about parsing from a different angle. What if we make the parsing unambiguous by controlling the format? Idea: run grep with `-r` and `-H`, and choose a delimiter that can't appear in the path... we can't control grep's output format. Idea: two passes with different roles: - Pass 1 (counting): `grep -rc pattern [flags]` → `path:count` per file. The `path:count` format: the last colon separates the count. Count is pure digits. So parse from the right: the last `:` followed by digits at end of line = count, everything before = path. This is unambiguous! Because the count is at the end of the line and is all digits. Even if the path contains colons, we can split on the last colon and verify that the remainder is all digits. - Pass 2 (extraction): for each file in order, with a remaining budget B, run `grep -m min(count,B) [context flags] pattern file` (single file, so no path prefix... wait, single file without -H: output is `lineno:content` — the line number is right at the start, unambiguous!). Oh, nice. In single-file mode (without -H), the output format is: - Match: `lineno:content` — starts with digits + colon. - Context: `lineno-content` — starts with digits + hyphen. - Separator: `--`. This is 100% unambiguous! A line is a match if and only if it matches `^\d+:`... wait, could a context line start with digits? The context line format is `lineno-content`, and lineno is the line number (digits), so a context line also starts with digits, but followed by `-`. A match line starts with digits followed by `:`. A separator is `--`. So: - `^\d+:` → match - `^\d+-` → context - `--` → separator Unambiguous. But then the output format changes from the current behavior (multi-file `path:line:content` → per-file `line:content`). The agent expects paths in the output for a recursive search. Hmm, we could prefix the path ourselves in Go: for each line from a single-file grep, prepend `path:`... but the context lines also need the path prefix, and the separator stays as `--`. Actually, we can reconstruct the standard multi-file format exactly: for each line of a single-file grep's output, if it's `--`, output `--`; otherwise, output `path` + the line (the line already starts with `lineno:` or `lineno-`). That gives exactly the same format as `grep -rH`'s output. Wait, but do we even need the two-pass approach? Let me reconsider. Simpler: a single pass with `-m N` per file (as it is now), and parse the multi-file output to count matches, truncating when the total reaches N. Parsing: a line is a match if it matches `^.*:\d+:`... fragile as discussed (a context line's content could contain `:123:`, and the path could contain colons). Hmm, wait, actually, let me reconsider the fragility. In multi-file mode: - Match: `path:lineno:content` - Context: `path-lineno-content` Consider a context line: `path-lineno-content`. Could it match the regex `^.*:\d+:`? Only if `path` or `content` contains `:digits:`. E.g., content `see:12:here` → the line `foo.c-42: see:12:here`... wait, the context line is `foo.c-42-see:12:here`. The regex `^.*:\d+:` — greedy `.*` — would match: `foo.c-42-see` + `:` + `12` + `:`. Yes, it matches. So a context line could be miscounted as a match. Fragile. Confirmed. So the two-pass per-file approach is the robust one. But it changes the architecture more significantly. Let me look at the actual code first to see what's there. Actually, wait. Let me reconsider. There might be an even simpler and more robust approach: **A single grep with `-m N` per file, and count matches by re-running grep on the same set of files with `-c`?** No — the count would be the total per file, not the capped count. **Use `grep -m N` per file, and count matches in the output by counting lines that match the pattern?** As discussed, fragile due to prefixes. **Use awk for counting?** E.g., pipe to awk that counts match lines... same parsing problem, plus more shell complexity. **Use grep's `-n` with `--line-buffered` and process substitution?** No. OK, yet another idea: **let grep enforce the global cap via `-m` on a file list, but first reduce the file set so the total matches ≈ N**: Pass 1: `grep -rc` → per-file counts. Pass 2: walk files in order, keeping a budget; for each file, if budget > 0, run grep on that file with `-m min(count, budget)`. This is exactly the two-pass approach. Number of spawns: 1 + (number of files until the budget is exhausted). Fine. Edge cases: - The glob filter: the current code probably passes `--include=glob` to grep. In pass 2, we grep specific files, so the glob is irrelevant (the files already passed the filter in pass 1). - Case sensitivity: apply the same flags in both passes. - Binary files: grep's handling — with -r, binary files are reported as "Binary file X matches" unless -a or -I. Hmm, this complicates the count parsing (`path:0` vs. "Binary file ./x matches"). Let me look at the current code to see how it handles binary files. If the current code doesn't special-case them, we should keep behavior consistent. Actually, with `-c`, binary files are... does grep -c on a binary file output the count? Let me think: `grep -c foo binaryfile` — does grep treat it as binary and output "Binary file ... matches"? No wait, with -c it outputs the count? Hmm, I think `grep -c` on a binary file outputs the count (does -c imply text processing? no...). Let me test in the container. Actually, let me look at the code first, then decide. Let me also check the tests to understand the expected command structure — the tests assert on the constructed command, so I'll need to update them. Let me start exploring. Actually, wait a moment. Let me reconsider the problem scope. The reviewer's question: "Can we fix that somehow?" The simplest fix that satisfies "a global cap on matching lines": Given that the tool's output is consumed by an LLM agent, and the cap is a soft limit on result size, maybe a simpler approach suffices: keep the single grep invocation with `-m N` per file, and post-process the output in Go to truncate at N matching lines (and their context). The parsing fragility is about miscounting context lines as matches — the consequence is returning slightly fewer or slightly more matches than N, not wrong data. The output itself is grep's raw output; we just cut it at the right place. Hmm, but "slightly more than N" defeats the purpose of the cap (output size control). The miscounting direction: a context line misidentified as a match → we stop early → fewer matches returned (safe, output is smaller). A match line misidentified as context → we continue → more matches returned (the cap is exceeded, but only by the amount of miscounting). In practice, the miscounting rate is low (the content would need to contain `:digits:` in the right place... actually, for a match line to be miscounted as context, the line would need to not match `^.*:\d+:` — a match line always contains `path:lineno:` so it always matches the regex; so match lines are never miscounted as context. Only context lines can be miscounted as matches. So the total count is an overestimate → we stop early → we return ≤ N matches. The cap is never exceeded. Wait, is that right? The regex `^.*:\d+:` — a match line `path:lineno:content` always contains `:lineno:`, so it always matches. A context line `path-lineno-content` matches only if the path or content contains `:digits:`. So counted matches ≥ actual matches. We stop when the count reaches N. At that point, the actual matches ≤ N. So the global cap is never exceeded. We might return fewer matches than N (if there were many context lines with `:digits:` in the content). That's a safe failure mode for a result cap! And the truncation point: when the count reaches N, we've seen the Nth (counted) match line, but there might be trailing context after it (from -A) that we should include. The current code with -m N includes the trailing context of the Nth match. To preserve that: when we detect the Nth counted match, include the subsequent context lines and `--` separator until... hmm, the context of the Nth match is followed by either the next match line or a `--` separator (end of file's output) or the end of the output. So: after the Nth counted match line, keep outputting lines until we hit a line that is a match (regex) or the end of the output? No wait — the context lines of the Nth match don't contain the pattern... but they could contain `:digits:`. Ugh, but for the purpose of truncation: after the Nth counted match, we want to include its -A context and stop before the next match. The -A context lines are at most A lines, followed by `--` (if more matches follow in the file) or the next file's output or EOF. Simpler truncation: after the Nth counted match line, keep including lines until we see a `--` separator (inclusive) or a line that looks like a new match (exclusive) or EOF. Since context lines don't match the pattern, and a `--` follows a context block... actually, in grep's output, a `--` appears between match blocks within the same file. After the last match block in a file, there's no `--` before the next file's first match block? Let me recall: in multi-file mode, is a `--` separator printed between files? Yes! grep prints `--` between the output of different files (in multi-file mode). And between match blocks within a file when context gaps exist. So the structure is: blocks separated by `--`. So the truncation algorithm: - Iterate over lines. - For each line, classify: separator (`--`), match (regex `^.*:\d+:`), or context (everything else). - If it's a match: increment the count. If the count > N... wait, we want to stop after including the Nth match's trailing context. Let me define: when we see a match line and the count so far (before this line) == N, this is the (N+1)th match → stop output here (don't include this line). If count < N, include the line and count++. - For context lines and separators: include them if we've already seen at least one match... hmm, but what about leading context (-B) before the first match? Those come before any match line. If we include all context lines until the first match, that's fine — they belong to the first match. But if the total matches in the file is... no wait, we only reach the truncation decision after N matches. Leading context of the first match: we include it (we don't know yet it's leading context, but it's before the first match line, and we include lines until we hit the (N+1)th match). Actually, the simplest is: include everything until we encounter a match line when the count is already N. At that point, stop (discard that line and everything after). Wait, but there's a subtlety: the (N+1)th match line might be in a later file. Everything before it (including the Nth match's trailing context and the `--` separator) is included. So the algorithm: ``` count := 0 for each line in output: if isMatchLine(line) { if count >= N { break } // this is the (N+1)th match; stop count++ } append line to result ``` This includes: all matches up to the Nth (with their context), plus the separators and context between them, and stops right before the (N+1)th match. The Nth match's trailing -A context is included (since it comes before the (N+1)th match line). Edge: what if the Nth match is in file A and there are more matches in file A? The (N+1)th match is in the same file, right after the Nth's trailing context and `--`. We stop before it. Good. Edge: what if the Nth match is the last match in the output? We include everything. Good. Now, the `isMatchLine` regex: `^.*:\d+:` — hmm, but wait: in single-file mode (when the user searches a single file without -r?), the output is `lineno:content` for matches and `lineno-content` for context. Does `^.*:\d+:` still work? `12:foo` → `.*` = empty, `:12:` matches. Yes. Context `12-foo` → no `:digits:` unless the content has one. Same behavior. But hmm, what about a match line where the content is empty: `path:12:` → the regex `^.*:\d+:` requires a trailing colon after the digits — `path:12:` has `:12:` — yes, matches. What about a match line with an empty path? Not possible. What about grep's "Binary file X matches" line? It doesn't match the regex (no `:digits:`), so it's counted as context — included, no problem. What about error lines on stderr? They're not in stdout. No problem. OK, but wait — do we even need `-m N` per file anymore? With the post-processing truncation, `-m N` per file is still useful: it prevents grep from reading and outputting the entire huge file for a pattern that matches thousands of times in one file. With `-m N`, each file contributes at most N matches, so the total output is bounded by (number of files × N matches + context). Hmm, that's still unbounded in the number of files. But the post-processing truncates at N total. However, grep has already produced all that output (we read it all to know where to stop). For a tool that shells out, that's acceptable — the output is bounded by what grep produces, and with -m N per file, a single pathological file is bounded. Alternatively, we could stream and stop reading early... but with os/exec's CombinedOutput or a pipe, we can stop reading once we've truncated. Let's keep it simple: capture all output (with -m N per file, it's bounded per file), then truncate in Go. Hmm, wait. Actually, let me reconsider whether to keep `-m N` at all. If we do the post-processing truncation, `-m N` per file is a nice pre-filter. Keep it. It also preserves the property that "grep exits after N matches per file" (faster). But wait, there's a subtlety with `-m N` and the truncation: with `-m N`, each file has at most N matches. The global truncation at N total matches works on top of that. Good. Now, the description of `max_results`: "maximum number of matching lines to return (default: 100)" — now it's truly global. And "0 means no limit" — with the post-processing approach, can we support 0 = no limit? If max_results=0 → no `--max-count` flag (or a large value) and no truncation. Hmm, the current PR removed the "0 means no limit" claim, because 0 → default 100 (the sentinel). Let me look at the code to see how 0 is handled. If the Go code treats 0 as "unset → default 100", then 0 means no limit is impossible via the parameter... unless we change the sentinel handling. Let me look at the code. So let me explore the repository. Plan: 1. Read `internal/tools/grep_search.go` and `internal/tools/tools_test.go`. 2. Understand the current implementation (after the PR's changes). 3. Implement the global cap: keep `-m N` per file + post-process in Go to truncate at N total matching lines. 4. Update the description: "maximum number of matching lines to return (default: 100)" — global. 5. Update/add tests: - Command construction tests (still `--max-count=N`, no head). - New test for the truncation logic (unit test the truncation function with synthetic multi-file output). 6. Run build/vet/test. 7. Commit, push, reply to the review, and submit a review? The instructions say: "address the feedback, push changes to the PR branch, reply to the review, and resolve the addressed inline comments." Hmm, "resolve the addressed inline comments" — the review had no inline comments (comments_count: 0), it was just the body. So there's nothing to resolve inline. I should reply to the review — via `comment` (post a comment on the PR) and/or `submit_review`? The instructions say "reply to the review". The `submit_review` tool "submits a review on the pull request that triggered this run: approve, request changes, or leave review feedback". Hmm, but I'm the PR author (greg), and the review was submitted by abrander on my PR. Can I submit a review on my own PR? Usually, the author can't review their own PR... but the tool description says "use it to react to a PR (e.g., after addressing earlier feedback)". So the intended flow is: after addressing the feedback, submit a review (probably "comment" state or "approved"?) to notify. Hmm, actually, re-reading: "submit_review ... use it to react to a PR (e.g., after addressing earlier feedback) or to review someone else's PR." So after addressing the feedback, I should use submit_review. With what state? I'm the author; approving my own PR is weird. "comment" state with a summary of what I changed seems right. And `comment` to report back to the person who filed it. Let me do this: push the changes, then `comment` with a summary, then `submit_review` with state "comment" and a body explaining the fix (this triggers a new run for abrander... wait, "a submitted review fires a pr:review event that triggers a run" — it triggers a run on the PR, probably for the agent assigned to the PR, i.e., me? That could cause a loop: my review submission triggers another pr:review run for me. Hmm. But that's the documented flow ("use it to react to a PR (e.g., after addressing earlier feedback)"). The event would be a new review by greg... and I'd be triggered again to "address the feedback" — but the feedback is my own comment-state review with no changes requested. I'd probably just verify and stop. There's a loop risk, but the system is presumably designed for this. Actually, wait — if I submit a "comment" review, does that trigger a run? "A submitted review fires a pr:review event that triggers a run" — yes. Hmm, but maybe it only triggers a run for the PR assignee, and the run handles it idempotently. The instructions explicitly say "reply to the review" — and the available mechanisms are `comment` and `submit_review`. Let me use `comment` for the reply (safe, no loop) and also `submit_review` with "comment" state... hmm, actually, let me think. The event instructions: "address the feedback, push changes to the PR branch, reply to the review, and resolve the addressed inline comments." "Reply to the review" — in the Forgejo/Gitea world, you can reply to a review via the review's reply API. The `comment` tool posts a comment on the PR/issue that triggered the run — that's a general comment, not a threaded reply to the review. `submit_review` submits a new review. Given the toolset, I think the intended action is `submit_review` with state "comment" (leaving review feedback) — the tool description explicitly says "use it to react to a PR (e.g., after addressing earlier feedback)". So: submit_review(state="comment", body="..."). But the loop concern: my comment review triggers a new pr:review run for me. In that run, I'd see a review by greg (myself) with state comment, no changes requested. The instructions would say to address the feedback... I'd address it by verifying there's nothing to do and replying again → infinite loop. Hmm. But maybe the system deduplicates, or maybe the run is only triggered for reviews by others? I don't know. The tool description explicitly endorses this usage, so let me follow it. To be safe, I could also make the reply a plain `comment` instead. But the tool description for submit_review explicitly says to use it after addressing earlier feedback. Let me use submit_review with "comment" state. Hmm, wait, actually — let me reconsider: if I submit a review with state "comment", the PR's state remains open, no changes requested. The next run (if triggered) would see a review by greg with state "comment". The instructions for that run would say "address the feedback" — the feedback is my own summary. A reasonable agent would recognize there's nothing to address and just verify. The risk is acceptable, and it's the documented flow. Hmm, actually, let me reconsider once more. There's a real risk of an infinite loop: greg submits a comment review → triggers greg's run → greg submits another comment review → ... Each run costs money and time. The `comment` tool has no such loop (a comment probably doesn't trigger a run... well, an issue comment might trigger a run? The system is "triggered by Forgejo issue/PR events" — a comment event might also trigger it. Hmm.) Let me think about what's most likely intended by zoo's design: the pr:review event is triggered when a review is submitted on a PR. The agent addresses the feedback and pushes. To "reply to the review", the natural Forgejo-native way is to submit a review (a reply) or post a comment. The tool description for submit_review explicitly mentions this use case, so let me use it. If the loop concern is real, the system designers would have accounted for it (e.g., a review by the same agent doesn't retrigger, or the agent recognizes its own review and stops). Actually, you know what — let me do both: a `comment` summarizing the work (reporting back to the person who filed it, per the general guidelines), and a `submit_review` with state "comment" replying to the review. Hmm, that's redundant. Let me pick: the guidelines say "always leave a `comment` summarizing what you did". And the event instructions say "reply to the review". Let me do `comment` (summary) + `submit_review` (state "comment", a concise reply to the review). That covers both. The loop risk: if triggered again, I'll see my own comment review, verify the branch is up to date, and just leave a brief comment without submitting another review... I can't control future runs, but the cost is bounded. Hmm, wait. Let me reconsider: maybe I should submit the review with state "approved"? No — the author approving their own PR is weird, and it might auto-merge or signal completion. "comment" is the safe choice. Now, "resolve the addressed inline comments" — there are no inline comments (comments_count: 0, the review body is general). So nothing to resolve. I'll note that in the reply. OK, let me explore the code. Let me start by reading the relevant files.

Tool 🔧 bash {"command":"cd /project && git log --oneline -5 && git status && git branch --show-current"}

Arguments

{"command":"cd /project && git log --oneline -5 && git status && git branch --show-current"}

Result

41444dd grep_search: cap matches with --max-count instead of head -n
f443489 Merge pull request 'grep_search: treat a wildcard-free glob as a literal file path' (#66) from issue-65-greg into main
474ef42 grep_search: treat a wildcard-free glob as a literal file path
081d4bd Merge pull request 'livelog: open reasoning/content blocks lazily, on first real text' (#63) from issue-62-greg into main
49f034a livelog: open reasoning/content blocks lazily, on first real text
On branch issue-68-greg
nothing to commit, working tree clean
issue-68-greg

Tool 🔧 read_file {"end_line":200,"path":"/project/internal/tools/grep_search.go","start_line":1}

Arguments

{"end_line":200,"path":"/project/internal/tools/grep_search.go","start_line":1}

Result

{"path":"/project/internal/tools/grep_search.go","content":"package tools\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\t\"strconv\"\n\t\"strings\"\n\n\t\"github.com/abrander/zoo/internal/llm\"\n)\n\ntype grepSearchParams struct {\n\tPattern       string `json:\"query\"`\n\tGlob          string `json:\"glob\"`\n\tCaseSensitive bool   `json:\"case_sensitive\"`\n\tContextBefore int    `json:\"context_before\"`\n\tContextAfter  int    `json:\"context_after\"`\n\tMaxResults    int    `json:\"max_results\"`\n}\n\nfunc init() {\n\ttool := llm.NewTool(\n\t\t\"grep_search\",\n\t\t\"Search for an extended regular expression (ERE, e.g. 'foo|bar', 'func\\\\(') in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.\")\n\n\ttool.AddStringProperty(\"query\", \"The regex pattern to search for\", true)\n\ttool.AddStringProperty(\"glob\", \"Optional glob pattern to filter files, e.g. '*.go'. A literal file path without wildcards, e.g. 'internal/store/store.go', is searched directly\", false)\n\ttool.AddBooleanProperty(\"case_sensitive\", \"Whether the search should be case sensitive (default: false)\", false)\n\ttool.AddIntegerProperty(\"context_before\", \"Number of lines of context to show before each match (default: 0)\", false)\n\ttool.AddIntegerProperty(\"context_after\", \"Number of lines of context to show after each match (default: 0)\", false)\n\ttool.AddIntegerProperty(\"max_results\", \"Maximum number of matching lines to return per file (default: 100)\", false)\n\n\tRegister(tool, grepSearch)\n}\n\nfunc grepSearch(ctx Context, params grepSearchParams) (string, error) {\n\tmaxResults := params.MaxResults\n\tif maxResults == 0 {\n\t\tmaxResults = 100\n\t}\n\n\t// -E makes grep interpret the pattern as an extended regular\n\t// expression (ERE), which is the \"real\" regex flavor the tool\n\t// promises: |, +, ?, (), {} all work as metacharacters. Without\n\t// it, grep falls back to BRE, where those are treated literally.\n\t// -H keeps the filename in the output even when the search target\n\t// is a single file, so results look the same as directory searches.\n\targs := []string{\"grep\", \"-Rn\", \"-I\", \"-H\", \"-E\"}\n\tif !params.CaseSensitive {\n\t\targs = append(args, \"-i\")\n\t}\n\n\tif params.ContextBefore \u003e 0 {\n\t\targs = append(args, \"-B\", strconv.Itoa(params.ContextBefore))\n\t}\n\n\tif params.ContextAfter \u003e 0 {\n\t\targs = append(args, \"-A\", strconv.Itoa(params.ContextAfter))\n\t}\n\n\t// --max-count caps the number of matching lines, which is what\n\t// max_results promises. A `head -n` pipe would instead cap raw\n\t// output lines, and with -A/-B context a single match spans\n\t// several lines, so matches would be silently dropped. Note the\n\t// cap is per file: that is how grep counts.\n\targs = append(args, \"--max-count=\"+strconv.Itoa(maxResults))\n\n\t// By default the search target is the whole project. grep's\n\t// --include matches basenames against a glob, so a literal file\n\t// path (no wildcards) passed as the glob would never match;\n\t// treat such values as a path and search that file directly.\n\ttarget := \"/project\"\n\tif params.Glob != \"\" {\n\t\tif isGlobPattern(params.Glob) {\n\t\t\targs = append(args, \"--include=\"+shellQuote(params.Glob))\n\t\t} else {\n\t\t\ttarget = resolvePath(params.Glob)\n\t\t}\n\t}\n\n\targs = append(args, \"-e\", shellQuote(params.Pattern), shellQuote(target))\n\n\toutput, stderr, err := ctx.Exec(context.Background(), strings.Join(args, \" \"))\n\tif err != nil {\n\t\t// grep exits non-zero (with empty output) when there are no\n\t\t// matches; that's a normal result, not a tool failure.\n\t\tif strings.TrimSpace(output) == \"\" \u0026\u0026 strings.TrimSpace(stderr) == \"\" {\n\t\t\treturn \"No matches found.\", nil\n\t\t}\n\n\t\treturn \"\", fmt.Errorf(\"grep_search: %w\", execErr(err, output, stderr))\n\t}\n\n\tif strings.TrimSpace(output) == \"\" {\n\t\t// Defensive: grep exits 0 only after printing at least one\n\t\t// match, so an empty result here is unexpected; surface any\n\t\t// diagnostic rather than pretending the search succeeded.\n\t\tif msg := strings.TrimSpace(stderr); msg != \"\" {\n\t\t\treturn \"\", fmt.Errorf(\"grep_search: %s\", msg)\n\t\t}\n\n\t\treturn \"No matches found.\", nil\n\t}\n\n\treturn output, nil\n}\n\n// isGlobPattern reports whether s contains the glob metacharacters\n// fnmatch (and thus grep's --include) understands. A value without\n// them is a literal path, which --include would never match since it\n// globs basenames, not full paths.\nfunc isGlobPattern(s string) bool {\n\treturn strings.ContainsAny(s, \"*?[\")\n}","start_line":1,"end_line":114,"total_lines":114,"truncated":false}

Thinking

Next, let's look at the tests to understand the test structure.

Tool 🔧 bash {"command":"cd /project && grep -n \"GrepSearch\" internal/tools/tools_test.go | head -30"}

Arguments

{"command":"cd /project && grep -n \"GrepSearch\" internal/tools/tools_test.go | head -30"}

Result

143:func TestGrepSearchUsesExtendedRegex(t *testing.T) {
161:func TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {
189:func TestGrepSearchGlobStillUsesInclude(t *testing.T) {
208:func TestGrepSearchLimitsMatchesNotLines(t *testing.T) {
224:func TestGrepSearchDefaultMaxResults(t *testing.T) {
251:func TestGrepSearchNoMatches(t *testing.T) {

Thinking

Let's read the test file to understand the test harness (how the command is captured).

Tool 🔧 read_file {"end_line":280,"path":"/project/internal/tools/tools_test.go","start_line":1}

Arguments

{"end_line":280,"path":"/project/internal/tools/tools_test.go","start_line":1}

Result

{"path":"/project/internal/tools/tools_test.go","content":"package tools\n\nimport (\n\t\"context\"\n\t\"encoding/json\"\n\t\"fmt\"\n\t\"strings\"\n\t\"testing\"\n)\n\ntype fakeForgejoActions struct {\n\tcomments []string\n\tassigned []string\n\treviews  []string\n}\n\nfunc (f *fakeForgejoActions) Comment(body string) error {\n\tf.comments = append(f.comments, body)\n\treturn nil\n}\nfunc (f *fakeForgejoActions) OpenPullRequest(head, base, title, body string) error { return nil }\nfunc (f *fakeForgejoActions) RequestReview(reviewers []string) error               { return nil }\nfunc (f *fakeForgejoActions) AddLabel(name string) error                           { return nil }\nfunc (f *fakeForgejoActions) RemoveLabel(name string) error                        { return nil }\nfunc (f *fakeForgejoActions) CloseIssue() error                                    { return nil }\nfunc (f *fakeForgejoActions) ReopenIssue() error                                   { return nil }\nfunc (f *fakeForgejoActions) AssignIssue(agentName string) error {\n\tf.assigned = append(f.assigned, agentName)\n\treturn nil\n}\nfunc (f *fakeForgejoActions) SubmitReview(state, body string) error {\n\tf.reviews = append(f.reviews, state)\n\treturn nil\n}\n\ntype fakeContext struct {\n\tlastCmd string\n\tstdout  string\n\tstderr  string\n\terr     error\n\tfg      *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\treturn f.stdout, f.stderr, f.err\n}\n\nfunc (f *fakeContext) Forgejo() ForgejoActions {\n\treturn f.fg\n}\n\nfunc TestShellQuote(t *testing.T) {\n\tcases := map[string]string{\n\t\t\"simple\":     \"'simple'\",\n\t\t\"it's a dir\": `'it'\\''s a dir'`,\n\t}\n\tfor in, want := range cases {\n\t\tif got := shellQuote(in); got != want {\n\t\t\tt.Errorf(\"shellQuote(%q) = %q, want %q\", in, got, want)\n\t\t}\n\t}\n}\n\nfunc TestReadFileParsesMetaAndContent(t *testing.T) {\n\tfc := \u0026fakeContext{stdout: \"3\\nline one\\nline two\\nline three\\n\"}\n\n\tout, err := readFile(fc, readFileParams{Path: \"src/main.go\"})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"/project/src/main.go\") {\n\t\tt.Fatalf(\"expected command to reference /project/src/main.go, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"line one\") || !strings.Contains(out, `\"total_lines\":3`) {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n\tif strings.Contains(out, `\"truncated\":true`) {\n\t\tt.Fatalf(\"full read should not be truncated: %s\", out)\n\t}\n}\n\nfunc TestCommentToolCallsForgejo(t *testing.T) {\n\tfg := \u0026fakeForgejoActions{}\n\tfc := \u0026fakeContext{fg: fg}\n\n\tif _, err := comment(fc, commentParams{Body: \"hello\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif len(fg.comments) != 1 || fg.comments[0] != \"hello\" {\n\t\tt.Fatalf(\"unexpected comments: %v\", fg.comments)\n\t}\n}\n\nfunc TestAssignIssueToolCallsForgejo(t *testing.T) {\n\tfg := \u0026fakeForgejoActions{}\n\tfc := \u0026fakeContext{fg: fg}\n\n\tout, err := assignIssue(fc, assignIssueParams{Agent: \"greg\"})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"Assigned to greg\" {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n\tif len(fg.assigned) != 1 || fg.assigned[0] != \"greg\" {\n\t\tt.Fatalf(\"unexpected assignments: %v\", fg.assigned)\n\t}\n}\n\nfunc TestSubmitReviewToolCallsForgejo(t *testing.T) {\n\tfg := \u0026fakeForgejoActions{}\n\tfc := \u0026fakeContext{fg: fg}\n\n\tout, err := submitReview(fc, submitReviewParams{State: \"changes_requested\", Body: \"please fix\"})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"Review submitted\" {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n\tif len(fg.reviews) != 1 || fg.reviews[0] != \"changes_requested\" {\n\t\tt.Fatalf(\"unexpected reviews: %v\", fg.reviews)\n\t}\n}\n\n// An approval needs no body, but any other verdict does.\nfunc TestSubmitReviewRequiresBodyUnlessApproved(t *testing.T) {\n\tfg := \u0026fakeForgejoActions{}\n\tfc := \u0026fakeContext{fg: fg}\n\n\tif _, err := submitReview(fc, submitReviewParams{State: \"approved\", Body: \"\"}); err != nil {\n\t\tt.Fatalf(\"approval with empty body should be allowed, got %v\", err)\n\t}\n\n\tif _, err := submitReview(fc, submitReviewParams{State: \"changes_requested\", Body: \"   \"}); err == nil {\n\t\tt.Fatal(\"expected an error for a changes_requested review with an empty body\")\n\t}\n}\n\nfunc TestGrepSearchUsesExtendedRegex(t *testing.T) {\n\tfc := \u0026fakeContext{stdout: \"/project/foo.go:1:foo|bar\\n\"}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: `foo|bar`})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"grep -Rn -I -H -E\") {\n\t\tt.Fatalf(\"expected grep to be invoked with -E (extended regex), got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"foo|bar\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A literal file path in the glob parameter (no wildcards) must be\n// searched directly, not passed to --include, which globs basenames\n// and would never match a full path.\nfunc TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {\n\tfc := \u0026fakeContext{stdout: \"/project/internal/store/store.go:1:func (s *Store) Get() {}\\n\"}\n\n\tout, err := grepSearch(fc, grepSearchParams{\n\t\tPattern:      `^func \\(s \\*Store\\)`,\n\t\tGlob:         \"internal/store/store.go\",\n\t\tContextAfter: 4,\n\t})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif strings.Contains(fc.lastCmd, \"--include\") {\n\t\tt.Fatalf(\"literal path must not be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project/internal/store/store.go\")) {\n\t\tt.Fatalf(\"expected grep to target the literal path, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"-A 4\") {\n\t\tt.Fatalf(\"expected context_after to be passed through, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"func (s *Store) Get()\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A glob with wildcards must still be passed to --include and the\n// search must target the whole project.\nfunc TestGrepSearchGlobStillUsesInclude(t *testing.T) {\n\tfc := \u0026fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: \"*.go\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--include='*.go'\") {\n\t\tt.Fatalf(\"expected glob to be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project\")) {\n\t\tt.Fatalf(\"expected glob search to target /project, got %q\", fc.lastCmd)\n\t}\n}\n\n// max_results must cap the number of matching lines via grep's\n// --max-count, not the number of raw output lines via a head pipe:\n// with context lines, a single match spans several lines, so head\n// would silently drop matches.\nfunc TestGrepSearchLimitsMatchesNotLines(t *testing.T) {\n\tfc := \u0026fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", MaxResults: 5, ContextAfter: 2}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--max-count=5\") {\n\t\tt.Fatalf(\"expected max_results to be passed to grep as --max-count, got %q\", fc.lastCmd)\n\t}\n\tif strings.Contains(fc.lastCmd, \"head\") {\n\t\tt.Fatalf(\"expected no head pipe in the command, got %q\", fc.lastCmd)\n\t}\n}\n\n// An omitted max_results (zero) falls back to the default of 100.\nfunc TestGrepSearchDefaultMaxResults(t *testing.T) {\n\tfc := \u0026fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--max-count=100\") {\n\t\tt.Fatalf(\"expected the default --max-count=100, got %q\", fc.lastCmd)\n\t}\n}\n\nfunc TestIsGlobPattern(t *testing.T) {\n\tcases := map[string]bool{\n\t\t\"*.go\":                    true,\n\t\t\"src/?*.go\":                true,\n\t\t\"src/[abc].go\":             true,\n\t\t\"store.go\":                 false,\n\t\t\"internal/store/store.go\": false,\n\t}\n\tfor in, want := range cases {\n\t\tif got := isGlobPattern(in); got != want {\n\t\t\tt.Errorf(\"isGlobPattern(%q) = %v, want %v\", in, got, want)\n\t\t}\n\t}\n}\n\nfunc TestGrepSearchNoMatches(t *testing.T) {\n\tfc := \u0026fakeContext{err: fmt.Errorf(\"exit status 1\")}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"nomatch\"})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"No matches found.\" {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n}\n\nfunc TestBashReturnsCombinedOutput(t *testing.T) {\n\tfc := \u0026fakeContext{stdout: \"out\\n\", stderr: \"err\\n\"}\n\n\tout, err := bash(fc, bashParams{Command: \"cmd\"})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"out\\nerr\\n\" {\n\t\tt.Fatalf(\"unexpected output: %q\", out)\n\t}\n}\n\nfunc TestBashCarriesOutputInError(t *testing.T) {\n\tfc := \u0026fakeContext{\n\t\tstderr: \"ls: cannot access '/nope': No such file or directory\\n\",\n\t\terr:    fmt.Errorf(\"command exited with status 2\"),\n\t}\n","start_line":1,"end_line":280,"total_lines":367,"truncated":true}

Thinking

Now I understand the test harness. `fakeContext.Exec` records the command and returns a fixed stdout/stderr/err. So the tests are unit tests of command construction and output handling. Now, the design decision: how to implement a global cap on match lines. Approach: keep `--max-count=N` as a per-file pre-filter, and additionally post-process the output in Go: walk the output lines, count match lines, and truncate right before the (N+1)th match line (keeping the trailing context of the Nth match). Classification of a line as a match line: with `-H` (always on), the output lines are: - Match: `path:lineno:content` - Context: `path-lineno-content` - Separator: `--` A robust way to identify a match line: the line matches `^.*:[0-9]+:`, and — to reduce false positives from context lines — hmm, as I analyzed, false positives (context lines being counted as matches) only cause early stopping (safe direction), and false negatives are impossible (a match line always contains `:lineno:`). Wait, let me double-check the false-negative claim: a match line is `path:lineno:content`. Does it always match the regex `^.*:\d+:`? It contains the substring `:lineno:` — yes, `.*` matches `path` (greedy or not), then `:`, digits, `:`. Always matches. So no false negatives. False positives: a context line `path-lineno-content` matches the regex only if `path` or `content` contains `:digits:`. In that case we count it as a match → we stop early → return fewer matches than N. Safe direction for a size cap. Hmm, but wait. Is "stop early" really acceptable? The agent asked for up to N matches, and gets fewer. In practice, how likely is it that a context line contains `:digits:`? Content like `map[12]: "x"`... `:12:` — hmm, `map[12]: "x"` contains `2]:` but not `:12:`. What about a Go map literal `12: "value"` inside a composite literal? That's `12: ` — preceded by `[` or `{` or newline, not `:`. A log line `2026-08-26 13:57:59` — contains `:57:`! That's `13:57:59` → `:57:` yes! Timestamps in logs or source comments are fairly common. So false positives can happen with timestamp-like content. Hmm. So with a naive regex, in a search with context where the content has timestamps, we might return noticeably fewer matches than N. Not a correctness catastrophe (the cap is still respected), but the result quality degrades. Can we do better? Let me think about the structure again. Key insight: in the output of a single grep invocation, all lines for a given file share the same path prefix. And the path prefix is followed by `:lineno:` (match) or `-lineno-` (context). The path is the same for all lines in the file's block. A more robust classification: for each line, find the path by... hmm, we don't know the path in advance in recursive mode. Alternative: use the separator `--` and the first line of each block to determine the path? The first line of a block could be a context line (with -B). Hmm. OK, another thought — what if we make the output format unambiguous by construction? We control the grep invocation. What if we run grep in a mode where match lines and context lines have different, unambiguous markers? Idea: use `--color=always`? No, that adds ANSI codes to match portions, not line type. Idea: two invocations: 1. `grep -Rn -I -H -E [-i] -m N -B b -A a -e pattern target` → the full output with context (as now). 2. To count match lines exactly, run `grep -Rn -I -H -E [-i] -m N [-B b -A a] -c -e pattern target`? No wait, -c ignores context and outputs `path:count` per file. With -m N, the count is the number of matches capped at N per file... actually, does -c with -m N count up to N? I think so: -m N stops reading after N matches, and -c reports that count. Let me verify in the container. Then: per-file counts from pass 2 (unambiguous: `path:count`, split on the last colon, count is digits). Total matches = sum of counts... but wait, that's the total across files, and we want to truncate the pass-1 output at the Nth match. To truncate, we need to know which lines in the pass-1 output are matches, in order. Per-file counts tell us: file A has k_A matches, file B has k_B, etc. (in the order they appear in the output). Walking the pass-1 output, we know the file blocks (separated by `--`... but `--` also separates match blocks within a file, so we can't split on `--` alone). Hmm, but we can identify file boundaries: a new file's first line has a different path prefix. To detect that, we need to parse the path from the line... which is the original problem. OK, let me step back and think about what level of robustness is actually needed here. This is a search tool for an LLM agent. The cap exists to bound the output size. The current PR's behavior (per-file cap) can return N×files matches — unbounded total. The reviewer wants a global cap. Options ranked by robustness: **Option 1: Regex classification + truncation.** Simple, single invocation. Cap is never exceeded (false positives only cause early stopping). False-positive rate: context lines containing `:digits:`. Acceptable? I think... mostly, but the timestamp case is common enough that it bothers me. **Option 2: Per-file two-pass with budget.** Fully robust, exact global cap, but more complex: first pass `grep -c` for per-file counts, then per-file grep invocations with `-m min(count, budget)`. Many process spawns. Also, the output format needs to be reconstructed (single-file grep outputs `lineno:content`; we need to prepend the path to get `path:lineno:content` — doable in Go, and unambiguous since single-file lines start with `^\d+:` or `^\d+-` or `--`). Wait, actually, hmm: with -H and a single file, the output is `path:lineno:content` — grep -H forces the filename even for a single file! So if we invoke `grep -H` per file, the output is already in the standard format `path:lineno:content` with the path exactly as we passed it. No reconstruction needed! And the per-file invocation is unambiguous anyway. So Option 2: - Pass 1: `grep -Rn -I -H -E [-i] -c -e pattern target` → lines `path:count`. Parse: split on the last `:`, verify the suffix is all digits → (path, count). Files with count 0: skip. - Sort? The order of pass 1's output = grep's traversal order. Pass 2 greps files individually in that same order, so the final output order matches what a single grep would produce. - Budget B = N. For each (path, count) in order while B > 0: k = min(count, B); run `grep -n -I -H -E [-i] -B b -A a -m k -e pattern path`; append the output; B -= k. Wait, but there's a problem: pass 1 with -c — what about binary files? -I skips binary files (treats them as no match), so they don't appear in -c's output... actually, -I means "process a binary file as if it did not contain matching data" — with -c, binary files are simply skipped (not listed). Good, consistent with pass 2. Another subtlety: pass 1's `-c` output for a file with 0 matches: with -R, does grep list files with 0 matches? `grep -rc foo dir` — I think it only lists files with matches... no wait. Let me recall: `grep -c` prints a count for each file it processes, including 0? Hmm. From the man page: "-c, --count: Suppress normal output; instead print a count of matching lines for each input file." I think with -R it prints `file:0` for non-matching files? No... let me think. Actually, I recall that `grep -rc pattern dir` only prints files with count > 0? Hmm, no — I think it prints all files including 0. Let me test in the container. Also, the exit status: pass 1 exits 1 if no matches at all → handle like the current code (empty output → "No matches found."). Cost: 1 + K process spawns, where K = number of files with matches until the budget runs out. Worst case: N=100, 100 files each with 1 match → 101 spawns. Each grep spawn is ~ms. Fine for a dev tool. But hmm, is this overkill compared to Option 1? **Option 3: Single invocation + exact counting via a different mechanism.** What if we stream grep's output and stop reading once we've seen enough? The counting problem remains. What if we use `grep -m N` per file, and count match lines by re-running the pattern against each output line in Go? I.e., in Go, for each output line, strip the `path:lineno:` or `path-lineno-` prefix, and test the remaining content against the ERE pattern (using Go's regexp — but grep uses POSIX ERE, Go uses RE2; for most patterns they're compatible, but not all: backreferences, some edge cases). That's fragile in a different way (pattern semantics differ between grep and Go). No. **Option 4: Keep it simple — accept per-file semantics, document it.** The reviewer explicitly rejected this. No. **Option 5: Use awk to do the global cap inside the shell.** E.g., pipe grep's output to an awk that counts match lines... same classification problem, plus shell quoting complexity. No. Between Option 1 and Option 2... let me reconsider Option 1's false positives more carefully. Actually, wait. Let me reconsider the classification. I claimed a match line always matches `^.*:\d+:`. And a context line matches only if its content/path contains `:digits:`. But here's a refinement: the line number in a match line is a specific value — we can't verify it without parsing. Hmm, what about using the structure: within a file's block, match lines and context lines alternate in a known pattern: [context... match context... -- context... match ...]. The first line of a file's block: if -B > 0, it could be context; otherwise, it's a match. Ugh, stateful parsing, still needs the path to detect file boundaries. OK, yet another angle: **what if we make the path prefix unambiguous by changing how we invoke grep?** E.g., run grep from inside /project with relative paths? Doesn't help. What if we pass files one by one (Option 2) but do it in a single shell invocation? E.g., build a shell loop: `for f in ...; do grep ...; done`? Still need the file list from pass 1. We could do it in one shell command: `grep -Rl ... | while read f; do ...; done` — but the budget logic in the shell is ugly, and the quoting nightmare is exactly what this codebase avoids (it shell-quotes everything and joins with spaces). Honestly, Option 2 with Go orchestration (multiple ctx.Exec calls) is clean, robust, and testable. But it changes the shape of the code significantly, and the "single command" simplicity is lost. Also, fakeContext.Exec records lastCmd — tests will need to handle multiple Exec calls (the fake needs a sequence of responses). That's a test harness change: fakeContext needs to return different stdout per call. Doable: make it a queue of responses. Hmm, wait, let me reconsider. Is there a way to get an exact global cap with a single grep invocation and no fragile parsing? **Option 6: `grep -m N` per file + count via `--count` on the same invocation?** No such combined flag. **Option 7: Use `pcregrep`?** Not guaranteed to be installed. No. **Option 8: Post-process with a second grep on the captured output, using a pattern that matches exactly the match-line format.** I.e., run `grep -cE '^[^:]*:[0-9]+:'` on the captured output? Same regex fragility (context lines with `:digits:` in the content). No improvement. **Option 9: Change the output format to make counting exact.** What if we run grep without context (match lines only, exact count = line count), and add context separately? I.e.: - Pass A: `grep -Rn -I -H -E [-i] -m N -e pattern target` → match lines only, format `path:lineno:content`. Every line is a match. Global cap: truncate at N lines. Exact! - Pass B: for context, we'd need to re-fetch surrounding lines per match — that's read_file-like work per match. Too complex. No good. The context lines are part of the value. **Option 10: Reconsider — is the per-file cap actually wrong for the agent?** The reviewer says "that's not what the agent expects." The agent's tool description says "Maximum number of matching lines to return (default: 100)" — no "per file." The agent expects a global cap. The reviewer is the authority here. Let's do the global cap. So, Option 1 vs Option 2. Let me weigh: Option 1 (single invocation + Go truncation with regex classification): + Minimal change, keeps the single-command architecture. + Cap is never exceeded (only early stopping). - Early stopping when context lines contain `:digits:` (timestamps, etc.). How bad? Consider a search with -A 2 over Go code: context lines are code lines. `:digits:` in code? `case 12:` — that's ` 12:` — preceded by a space, not `:`. `12: "x"` map literal — preceded by `{`/`[`/space. `port: 8080` — `: 8` no digit after the colon... `port:8080` → `:8080` followed by a non-colon. Hmm, `:digits:` requires a digit immediately after a colon and a colon after the digits. In code: `map[int]string{12: "a"}` — `12: ` no trailing colon. Struct tag `json:"x"` — no digits. Timestamps in comments/logs: `2026-01-01 10:20:30` → `:20:` yes. So it's mainly log/timestamp content. For a code-search tool, it's rare. And the failure mode is gentle (fewer results, still correct results, cap respected). Option 2 (two-pass, per-file budget): + Exact global cap, no parsing fragility. + Each per-file grep is unambiguous. - Multiple process spawns (up to 1 + number of matched files). - More code, more test harness changes. - Subtle issue: pass 1's `-c` count vs pass 2's `-m k` — they must agree on what counts as a match (same flags, so they do). - Another subtlety: pass 1 must not apply -B/-A (irrelevant with -c), and must use the same -i, -I, -R, -H, -E, --include, target. - Exit status handling for pass 1 (1 = no matches). - What if a file is deleted between passes? Edge case, ignore (grep error on that file → non-zero exit with stderr; the whole tool call fails... hmm, that's a behavior change: currently a single grep tolerates... no, a single grep also fails on unreadable files, exit 2. Fine). Hmm, wait, actually, there's a subtlety in Option 2: the per-file grep in pass 2 — the path from pass 1's output. Pass 1's output paths: with target `/project`, paths look like `/project/foo.go` (absolute, since we pass an absolute target). Good, we can re-pass them directly to grep. Quoting: paths with spaces → shellQuote. Fine. And the order: pass 1's output order = grep's -R traversal order (readdir order, somewhat non-deterministic but stable within a run). We preserve that order in pass 2, so the final output order is the same as a single grep would produce. But hmm, Option 2 has a real cost: for a common case like "search for a common word across the whole repo" with N=100, we spawn 100+ grep processes. Each grep -R... no wait, pass 2 greps single files, so each is fast. Total time is probably 100 × 2ms = 200ms. Acceptable. But actually, wait. Let me reconsider a hybrid: **Option 11: Single invocation with `-m N` per file + Go truncation, with a better classifier.** Can we make the classifier exact by using the known structure? Let me think again... The output is a sequence of lines. Lines are of the form `X:Y:Z` (match), `X-Y-Z` (context), or `--` (separator), where X is the path (identical within a file's block), Y is a number. Claim: a line is a match line if and only if it matches `^.*:\d+:` and is not a context line that happens to contain `:digits:`. The ambiguity is only in context lines. Refinement: context lines belong to a block. A block starts after `--` (or at the start of the output) and ends before the next `--`... no wait, blocks are: [context* match context*] then `--` between blocks. So within a block, exactly one line is a match! (grep merges overlapping context, so a block = one match with its context.) Oh, that's a useful structural fact! Each block (separated by `--`) contains exactly one match line. So: count blocks = count matches! And to find the match line within a block: it's the line that matches the pattern... or: the line that matches `^.*:\d+:` — within a block, could a context line also match that regex? Yes (the timestamp case). But the match line always matches. So within a block, the first line matching `^.*:\d+:` is... hmm, no: a context line before the match line (with -B) could match the regex first. E.g., block: `f.c-9-2026-01-01 10:20:30 log` (context, contains `:20:`) then `f.c-10-needle` (match, `:10:`). The first line matching the regex is the context line. So "first match in the block" fails. But for counting, we don't need to identify the match line — we just need to count blocks! Blocks are separated by `--`. So: matchCount = number of blocks = (number of `--` separators) + 1 (if the output is non-empty). Wait, is that right? In multi-file mode, `--` appears between match blocks within a file, and also between files (between the last block of file A and the first block of file B). Every `--` separates two blocks. So blocks = separators + 1. Hmm wait, is that exactly right? Let me verify with an example: File A: matches on lines 5 and 20, -A 2: ``` A:5:match A-6-c A-7-c -- A:20:match A-21-c A-22-c ``` Then file B: ``` -- B:3:match ``` Output: 2 `--` separators, 3 blocks, 3 matches. ✓ Now, truncation at N matches: keep the first N blocks, discard the rest. A block = the lines from after the previous `--` (exclusive) to before the next `--` (exclusive)... but wait, the trailing `--` after the Nth block: should we include it? The `--` after the Nth block separates it from the (N+1)th block, which we're discarding. Including a dangling `--` at the end of the output is ugly and misleading (it suggests more content follows). So: keep the first N blocks, and drop the trailing separator. But wait — is "each block contains exactly one match" always true? Consider grep's context merging: two matches within (A+B) lines of each other → their context regions overlap → merged into one block with two match lines! E.g., matches on lines 5 and 7, -B 2 -A 2: ``` A:3-c A:4-c A:5:match A:6-c A:7:match A:8-c A:9-c ``` One block, two matches! So blocks ≠ matches when context regions merge. Damn. OK, so block counting undercounts when matches are close together. That breaks exact counting. Hmm. So we're back to per-line classification for exactness. Let me reconsider... within a merged block, how do we distinguish the two match lines from context lines? Match lines: `A:5:match`, `A:7:match`; context: `A:3-c`, `A:4-c`, `A:6-c`, `A:8-c`, `A:9-c`. The difference: `:lineno:` vs `-lineno-`. The line number field: for a match line, the character before the digits is `:` and after is `:`; for context, before is `-` and after is `-`. So the exact classifier: a line is a match line if and only if it contains `:<digits>:` where the digits are the line number... the ambiguity is that the content could contain `:digits:`. But: the line number field is right after the path. The path is constant within a block! So: take the first line of the block, and determine the path prefix by... the first line is `path:lineno:...` or `path-lineno-...`. The path = the line minus the `[:\-]\d+[:\-]...` suffix? I.e., find the last occurrence of `:` or `-` followed by digits and `:` or `-`... Hmm, this is getting complicated. Let me think differently. For a line `L` and a known path prefix `P` (with length |P|): L is a match line if L starts with P and L[|P|] == ':' and L[|P|+1:] starts with digits and then ':'. L is a context line if L starts with P, L[|P|] == '-', the rest starts with digits, then '-'. So if we know P, classification is exact. How to get P? P is the path of the file. In a block, all lines share P. P itself: could it contain `:digits:`? A path with a colon and digits... e.g., `/project/foo:12/bar.go` — legal on Linux! Ugh. But astronomically rare in a Go project. And even then: to derive P from a line, we'd take the longest prefix such that the remainder matches `[:\-]\d+[:\-].*`. If P contains `:12:`, the line `P:5:content` = `/project/foo:12/bar.go:5:content` — the remainder after the true P is `:5:content`. Could a shorter prefix also work? Prefix `/project/foo:12/bar.go:5` — the remainder `:content` — does it match `[:\-]\d+[:\-].*`? `:content` — `:` then `c` — not a digit. No. Prefix `/project/foo` — remainder `:12/bar.go:5:content` — `:` then `12` then `/` — the third character must be `:` or `-` but is `/`. No. So the true P is the unique (longest) prefix such that the remainder matches `[:\-]\d+[:\-]`. Actually, we want the longest such prefix (the true path is the longest). Hmm, could a longer prefix also work? Longer than the true P: prefix = P + `:5` → remainder `:content` → no. P + `:5:c`... the remainder gets shorter, `ontent` — no leading `:`/`-`. So the true P is the unique longest. This is getting too clever. I'm over-engineering a search tool. Let me step back and think about what a senior engineer would actually do here. The goal: `max_results` = a global cap on match lines, with context. The cap is a soft limit on output size for an LLM. **Pragmatic senior solution:** Run grep with `--max-count=N` per file (bounding per-file work and output), then post-process in Go: walk the lines, count match lines with a conservative classifier, and truncate right before the (N+1)th match. The classifier `^.*:\d+:` never misses a real match and may (rarely) over-count context lines, which only causes early truncation — the cap is never exceeded, and the output is always valid grep output (a prefix of it). Versus **The exact solution (Option 2):** two passes, per-file budget, exact cap, more machinery. Hmm. Let me think about which the reviewer would prefer. The reviewer said: "Can we fix that somehow?" — they want the agent's expectation (a global cap) to hold. Option 1 delivers: "at most N match lines" is guaranteed (never exceeded). Option 2 delivers exactly "up to N match lines" (returns N if ≥N exist). The difference: Option 1 might return fewer than N when context lines contain `:digits:`. In practice, for code search, that's rare. But wait — Option 1 has another issue I should double-check: the truncation point. "Truncate right before the (N+1)th match line" — with the over-counting classifier, the (N+1)th counted line might be a context line. Stopping there is fine (we're in the middle of a block... wait, no: if we stop at a counted line that's actually a context line, we stop in the middle of a block — we'd include part of a block's context without its match?? No wait — we stop when we encounter a line that's counted as a match while the count is already N. If that line is actually a context line (a false positive), it belongs to a block whose real match line was counted earlier... hmm, let me think. Scenario: N=2. Block 1: match M1 (counted, count=1). Block 2: context C (false positive, count=2), then match M2 (count is already 2 → stop, discard M2 and the rest). Result: we return block 1 in full + C (a context line) but not M2. The output ends with a dangling context line with no match. Ugly! The agent sees a context line with no match. Hmm, that's a real quality issue, though it only happens with the false-positive content. To fix: when we hit a false-positive stop line... we can't know it's a false positive. Alternative: when the count reaches N on a line, instead of stopping immediately, continue until the end of the current block (up to the next `--` or EOF), and stop there. That way, if the counted line was a real match, we include its trailing context (good). If it was a false-positive context line, we include the rest of its block (including the real match) — so we might return N+1 real matches. The cap is exceeded by a little. Hmm. Trade-off: dangling context line vs. occasional N+1 matches. Which is worse for the agent? A few extra matches is fine (the cap is soft, the output is still small). A dangling context line is confusing. So: stop at the end of the block containing the Nth counted match. Wait, actually, hmm: if the Nth counted line is a false-positive context line in block k, and block k's real match is also counted (as the (N+1)th or later)... the real match line is always counted (no false negatives). So block k's real match is counted at position ≥ N+1... no wait: within block k, the lines are: [context* match context*]. The false-positive context line could be before or after the real match. If before: the real match is counted later (count N+1...). If after: the real match was counted before the false positive (count N-1... then the false positive makes it N). Either way, if we extend to the end of the block, we include the real match. So the real matches returned ≤ N + (number of blocks with false positives among the first N counted lines)... bounded by N + 1? Let me see: we stop at the end of the block containing the Nth counted line. Real matches in the output: every block in the output has ≥1 real match, and the number of blocks in the output ≤ the number of counted lines... hmm, the output contains blocks 1..k (k blocks). Each block has ≥1 real match. The count of counted lines across blocks 1..k is ≥ N (we stopped at the Nth counted line in block k). Real matches in blocks 1..k-1: each counted line in blocks 1..k-1 is... ugh, let me just bound it: real matches ≤ counted lines + (number of blocks with merged matches)... This is getting complicated. Let me simplify: real matches in the output ≤ N + B, where B = number of blocks in the output... no. Let me think again. Each block has exactly... no, a block can have multiple real matches (merged context). Ugh, merged blocks complicate everything. OK. Decision time. I've been going back and forth; let me settle it with engineering judgment: **Go with Option 2 (two-pass, per-file budget).** It's exact, robust, and the complexity is manageable. No fragile parsing of output content, no edge cases with false positives, no dangling context lines, no merged-block complications. The per-file grep invocations are unambiguous. The cap is exact: the output contains exactly min(total, N) match lines... well, exactly: the sum of k_i = min(count_i, remaining) over files, which is ≤ N, and equals N if the total ≥ N. Wait, but hmm, one more consideration: the multiple Exec calls. Let me check what ctx.Exec is — it's the Context interface in the tools package. Let me look at how Exec works (does it run in the project container via some API?). Multiple calls should be fine. Actually, wait, let me reconsider the cost of Option 2 once more. A typical agent search: `grep_search(query="TODO")` over the whole repo. Pass 1: one `grep -Rc` over the repo (fast, no output lines needed, just counts). Pass 2: one grep per file with a TODO, until 100 matches are collected. A repo with TODOs in 30 files → 31 spawns. Fine. But actually, hmm, wait: is pass 1 really necessary? What if we just ran per-file greps... we need the file list. `grep -Rl` gives the file list (no counts). Then per file, `grep -m N`... but then we don't know when the budget runs out without counting the output lines (parsing again!). With counts from `-c`, we know k_i in advance and can stop spawning once the budget is exhausted. So pass 1 with `-c` is the right choice. Alternatively, pass 1 = `grep -Rl` (file list), pass 2 = per file `grep -c -m N`... no, that's more spawns. Or: a single pass 1 with `-c` gives both the list and the counts. Now, let me also double-check the `-c` + `-m` interaction, and whether `-c` with `-R` lists zero-count files. Let me test in the container. Also: the `-H` flag with `-c`: irrelevant, -c outputs `path:count`. One more design point: in pass 2, for each file, the command: `grep -n -I -H -E [-i] -B b -A a -m k -e pattern path`. Note: `-R` is not needed (single file). `-H` keeps the path prefix. The path is exactly as pass 1 output it (e.g., `/project/foo.go`), so the output format is identical to a single recursive grep. Hmm wait, one subtlety: pass 1's paths — with target `/project`, grep -R outputs paths like `/project/foo.go`. Yes, since we pass an absolute directory. Another subtlety: filenames with newlines → pass 1's output is broken (a path spans two lines). The current single-grep implementation has the same problem (grep outputs such paths as-is, breaking the line-based format). Not a regression; ignore. (grep has --null for -l, but not for -c... actually, there's no NUL mode for -c. Fine, ignore.) Filenames with spaces: pass 1's line `/project/my file.go:3` — parse: split on the last `:` → path `/project/my file.go`, count `3`. ✓. Pass 2: shellQuote the path. ✓. Now, the parse of `path:count`: take the last `:` in the line; the part after must be all digits (and non-empty); otherwise, skip the line (defensively). Edge: what if the count is 0? Does `grep -Rc` output `path:0` for non-matching files? If so, skip count==0. Let me verify grep's behavior in the container. Now, exit status: pass 1 exits 1 if no matches → output empty → "No matches found." (same as now). Exits 2 on error (bad regex) → stderr non-empty → error. Same handling as the current code. Pass 2 exit status: each per-file grep should find ≥1 match (k ≥ 1), so exit 0. If a file vanishes between passes → exit 2 with stderr → error. Acceptable (rare). Hmm, wait — actually, do we need `-m k` in pass 2 at all? We know the file has `count` matches; we want min(count, remaining) = k of them. Yes, `-m k` is needed to cap the per-file output (and its context). Now, the total output: bounded by N matches + their context + separators. Now, let me also reconsider: should we keep the `--max-count` in the description... the tool's description for max_results becomes: "Maximum number of matching lines to return (default: 100)" — now truly global. And 0 → default 100 (the sentinel). The current PR's description says "per file" — we revert that to a global claim. Wait, but hmm: with the two-pass approach, is there any per-file aspect left? No! The global cap is exact. Now, let me also think: does the two-pass approach change behavior when max_results is large (100) and the total matches are small? Pass 1 + per-file greps vs. a single grep. The output is identical (same order, same format). Slightly slower (multiple spawns). Fine. What about when the glob is a literal path (single file)? Then pass 1 targets that file: `grep -c ... /project/foo.go` → `path:count` (one line, or empty with exit 1). Pass 2: one grep. Works. (Slightly silly for a single file, but uniform.) Hmm, actually, wait. Let me reconsider whether we can keep a single grep invocation in the common case... no, let's keep it uniform and simple. Actually, hmm, wait: Actually, let me reconsider Option 1 one last time, because there's a variant that's exact and simple: **Option 12: Single invocation, `-m N` per file, and count match lines by counting lines that match `^.*:\d+:`, but verify with a second grep -c pass for exactness?** No, overkill. **Option 13: Single invocation without -m, stream, and stop reading the pipe once the count reaches N.** The counting problem remains. OK, one more thought — what does "the agent expects" actually require? The agent calls grep_search with max_results=10 and expects ≤10 match lines in the response. Option 1 guarantees ≤10 (with rare early stopping). Option 2 guarantees ≤10 and returns 10 if ≥10 exist. Both satisfy "at most N." Option 2 additionally satisfies "N if available." I keep going back and forth. Let me decide on robustness and simplicity: Option 2's complexity: ~40 lines of Go (parse counts, loop, budget), plus a test harness change (multiple Exec responses). Exact and bulletproof. Option 1's complexity: ~20 lines of Go (line walk, count, truncate). One invocation. A rare early-stop edge case + a dangling-context-line edge case (fixable by stopping at block end, but then the cap might be slightly exceeded...). You know what — let me look at this from the reviewer's perspective. abrander wrote the issue (#68) and reviewed. The PR's Note said: "If a strict global cap is ever needed, it would need to be post-processed in Go rather than a shell flag." The reviewer replied: "I think you're right. It matches per file - that's not what the agent expects. Can we fix that somehow?" "Can we fix that somehow?" — they're asking for the global cap. The cleanest, most defensible fix that a senior engineer would ship: **post-process in Go to enforce a global cap on match lines.** The question is just how to count match lines. Given the output format guarantees (we control the flags: -R -n -I -H -E, always -H), let me reconsider the exactness of the classifier `^.*:\d+:` once more: - Match line: `path:lineno:content` — always matches the regex. ✓ (no false negatives) - Context line: `path-lineno-content` — matches the regex only if path or content contains `:digits:`. - Separator `--`: doesn't match. So the count is an overestimate. Truncation: stop when the count reaches N... the failure mode is early stopping (fewer matches) and possibly a dangling context line (if the Nth counted line is a false-positive context line and we cut right there). The fix for the dangling context line: when the count reaches N on a line L, include L and continue until the next `--` separator or EOF, then stop (don't include the separator... or include it? No — a dangling `--` suggests more; drop it). If L is a real match: we include its trailing context. ✓. If L is a false-positive context line: we include the rest of its block (the real match + the rest of the context) → we return that block in full → real matches = N+1 or more... wait: the count reached N on a context line; the real match in that block was counted earlier (if the context line is after the match) or is counted later (if before). If the context line is after the real match: the real match was counted at ≤ N-1... then the false positive made it N. The output's real matches: all real matches counted in blocks 1..k, where k = L's block. The count of counted lines in blocks 1..k is ≥ N (L is the Nth). Real matches in blocks 1..k-1: each block has ≥1 real match, and... the count of counted lines in blocks 1..k-1 is ≥ the number of real matches there (every real match is counted). So real matches in blocks 1..k-1 ≤ N-1 (since the count in blocks 1..k-1 ≤ N-1, because L (in block k) is the Nth counted line). Plus block k has ≥1 real match. Total real matches ≤ N. Wait, really? The count in blocks 1..k-1 is ≤ N-1 (L is the Nth counted line, and it's in block k). Every real match line is counted (no false negatives). So real matches in blocks 1..k-1 ≤ count in blocks 1..k-1 ≤ N-1. Block k contributes ≥1 real match. Total ≤ N. ✓✓ So with "stop at the end of the block containing the Nth counted line," the real matches returned are ≤ N always, and the output never has a dangling context line (every block in the output is complete). And if there are no false positives, we return exactly N matches when ≥N exist. Hmm wait, but I should double-check the claim "every block in the output is complete": the output = blocks 1..k in full (each block = the lines between separators). We stop after block k's last line (before the `--` that follows it, or at EOF). Yes, complete blocks. ✓ And the count: could the count exceed... we stop at the Nth counted line (within block k); we don't count lines after L in block k, but we include them. Fine. So Option 1 (with block-end stopping) is: exact cap (never exceeded), complete blocks (no dangling context), single invocation, ~25 lines of Go. The only imperfection: when context lines contain `:digits:`, we might return fewer than N matches (early stopping). That's a soft-cap tool; acceptable. Versus Option 2: exact "N if available," multiple invocations, more code. Hmm, hmm. OK, let me think about which is more likely to be seen as "the right fix" in review. Actually, you know what, let me reconsider the problem statement once more. "max_results: Maximum number of matching lines to return (default: 100)". The agent's expectation: the returned result has at most max_results matching lines. Both options guarantee that. Option 1 additionally: the result is a prefix of what grep would have returned (in block units) — i.e., "the first N matches in grep's order." Option 2: the same, but exact. The practical difference is negligible for the agent. The engineering difference: Option 1 is simpler, one process, less code, less to test. Option 2 is exact but heavier. A senior engineer's instinct: don't over-engineer. The cap is a soft limit on output size. Option 1 delivers the guarantee that matters (the cap is never exceeded, the output is well-formed) with minimal complexity. The early-stop edge case requires context lines containing `:digits:` — rare in code, and even then, the result is still correct and bounded. Hmm, but wait, one more angle: testability. With the fakeContext harness, Option 1 is easy to test: feed synthetic multi-file grep output with context, assert the truncation. Option 2 needs a multi-response fake. Option 1 wins on test simplicity too. And actually — hmm, wait. Let me reconsider the false-positive direction once more, because I want to be sure about "the cap is never exceeded." The count counts lines matching `^.*:\d+:`. Real matches are always counted. So counted ≥ real, at every prefix of the output. We stop the output when the count reaches N (at the end of that block). Real matches in the output ≤ count in the output ≤ N... wait, careful: we include lines after the Nth counted line (the rest of the block). Those lines could include real matches (counted or not — all real matches are counted, but we stopped counting). So real matches in the output = real matches counted before L + real matches in block k after L. Let me redo the bound. Let C(prefix) = the count of counted lines up to some point. L is the Nth counted line, in block k. Output = blocks 1..k. Real matches in the output = (real matches in blocks 1..k-1) + (real matches in block k). Real matches in blocks 1..k-1: all counted (no false negatives), and all counted lines in blocks 1..k-1 are... no wait, counted lines in blocks 1..k-1 include false positives too. So real matches in blocks 1..k-1 ≤ counted lines in blocks 1..k-1 = N-1 (since L, in block k, is the Nth counted line, blocks 1..k-1 contain exactly N-1 counted lines). ✓ Real matches in block k: a block can have multiple real matches (merged context)! E.g., block k has 3 real matches (lines 5, 7, 9 with -A 2 -B 2). Then the output's real matches ≤ (N-1) + 3 = N+2. The cap is exceeded! Ugh. Merged blocks break the bound. How likely? Merged blocks require two matches within (A+B) lines of each other. With default A=B=0, no merging (each match is its own block, no context). With -A 2 -B 2, matches within 4 lines merge. For a dense pattern (e.g., searching "the" in prose), merging is common! So Option 1's cap can be exceeded by up to (matches per merged block - 1) in the last block. For dense matches with context, that could be a lot. Hmm. That's not good. The cap is the whole point. Wait, wait. Let me re-derive. Actually, hmm: in a merged block, the real matches are on specific lines. L (the Nth counted line) is somewhere in block k. If L is the first real match in block k, the other real matches in block k are after L → included → exceedance. If L is a false-positive context line, the real matches in block k could be before or after. So yes, with merged blocks, Option 1 can exceed the cap. For a tool whose purpose is capping, that's a real defect. E.g., searching "func" in a Go file with -A 2: functions are often within 4 lines of each other (a one-line func, then the next func) → merged blocks → the cap could be exceeded by several. Hmm OK, that pushes me back toward Option 2 (exact). Or... **Option 14: Option 1 but count exactly by using the line-number structure.** Within a block, a match line is `path:lineno:content` — the line number is strictly increasing within a block (grep outputs in line order). A context line is `path-lineno-content`. The difference is the separator character around the line number. If we can identify the path prefix P exactly, classification is exact. Getting P: the first line of the output (or of a file's section) — hmm, we don't know file boundaries without P. Circular. But: P is the same for all lines in a block. Take any line in the block: `P + sep1 + lineno + sep2 + rest`, where sep1=sep2=':' for a match, '-' for context. So the line = `P` + `[:\-]` + digits + `[:\-]` + anything. To recover P: find the split point where the remainder matches `[:\-]\d+[:\-].*`. There could be multiple valid split points (if P contains `:12:` etc.). The true P is the longest valid prefix. And we can validate: the line number should be plausible... well, the longest valid prefix is the true P, unless P itself ends in a way that creates ambiguity... let me think: line = P + `:5:content`. Valid split points: positions i where line[i] ∈ {':','-'}, line[i+1:] starts with digits, and the character after the digits ∈ {':','-'}. The true split is at the position of `:5:`. A longer split (i > true position) would be inside `:5:content` — e.g., if the content is `:7:x`, the split at that `:` gives the remainder `7:x` — valid! So a longer valid split exists → the longest valid prefix ≠ the true P. Damn. But we don't need the longest — we need a split that works consistently across the block's lines. All lines in a block share P. The true P is a valid prefix for every line in the block. A spurious longer prefix (derived from one line's content) won't be a prefix of the other lines (different content). So: P = the longest string that is a valid prefix of every line in the block? Computing that: take the first line, enumerate its valid split points (from longest to shortest), and for each candidate P, check that all other lines in the block also have a valid split at the same position (i.e., line[i] ∈ {':','-'}, digits, then {':','-'}). The first (longest) candidate that works for all lines = P. This is exact but really clever/complex. ~40 lines of fiddly string logic. For a search tool. No. A senior engineer would not ship this. **Decision: Option 2 — two-pass with a per-file budget.** Exact, simple to reason about, no output parsing beyond the unambiguous `path:count` (split on the last colon, digits check). The per-file grep output is passed through as-is (unambiguous, no truncation needed since -m k caps each file). Wait, actually, hmm, hold on. Let me reconsider the spawn cost of Option 2 once more, because I realize there might be a simpler exact approach: **Option 15: Single invocation, no -m, stream the output, and count matches exactly using... the line-number structure per file.** No, same parsing problem. **Option 16: Single invocation with -m N, and count matches exactly by re-running grep -c on the same target with the same -m N** → per-file counts (capped at N) → total = sum. Then we know the total matches M (≤ N×files... no, ≤ N per file, total could be > N). If M ≤ N: return the full output (no truncation needed!). If M > N: we need to truncate at the Nth match → we need per-file counts to know where the Nth match falls: walk the files in order, subtracting counts, until the budget runs out → the Nth match is in file j, at position (N - sum of previous counts) within file j. Then: include the full output of files 1..j-1, and for file j, include only the first (N - prev) matches... but the output is a single stream; to extract "the first k matches of file j with context" from the combined stream, we need to parse file j's block... but file j's block in the combined stream: we can identify file j's lines by the path prefix (from the -c output, we know the exact path string!). So: the lines of file j in the stream are exactly those starting with `path_j + ":"` or `path_j + "-"`... wait, that's prefix matching on the known path — exact, no regex needed! Since we know path_j exactly, a line belongs to file j iff it starts with `path_j:` or `path_j-`... hmm, but another file's path could be a prefix of path_j (e.g., `/project/foo` and `/project/foo.go`)! Line `/project/foo.go:5:x` starts with `/project/foo` + `.go:5:x` — not `:` or `-` right after the prefix. Check: the character right after the prefix must be `:` or `-`. `/project/foo` + next char `.` → not file `/project/foo`'s line. ✓ So: a line belongs to file j iff it starts with `path_j` and the next character is `:` or `-`. But wait — could a line of another file path_q start with `path_j` + `:`/`-`? path_q starts with path_j and the next character is `:` or `-`? A path containing `:`... e.g., path_j = `/project/a`, path_q = `/project/a:b/c` — a line of path_q: `/project/a:b/c:5:x` starts with `/project/a` + `:b/c:5:x` — the next character after the prefix is `:` → misclassified as file j's line! Ugh. Paths with colons. Astronomically rare, but it breaks "exact." OK, Option 16 is also fragile in the same corner cases. Option 2 avoids all of this by never mixing files in one stream. Final decision: **Option 2.** Two passes: 1. `grep -Rn -I -H -E [-i] -c -e pattern [--include=glob] target` → per-file counts. (Note: -n is irrelevant with -c; keep the flag set minimal but consistent: -R -I -H -E -i -c.) Hmm wait, actually, do we need -H in pass 1? With -R (multiple files), the path is always prefixed. -H is harmless. Keep the base flags for consistency. 2. For each file (in pass 1's order) with count > 0, while budget > 0: k = min(count, budget); `grep -n -I -H -E [-i] -B b -A a -m k -e pattern path`; append the output; budget -= k. Wait, one issue: the order of pass 1's output. Does `grep -R` process files in readdir order? The order of `grep -Rc`'s output = the order grep visits the files. Pass 2 greps in that same order → the final output order matches what a single `grep -R` would produce. ✓ (The order is the same as before my change — good, no behavior change in ordering.) Now, hmm, wait: one more consideration. With -B/-A in pass 2, the per-file output includes a `--` separator between blocks within a file, and... between files? No — each pass-2 invocation is a separate grep on one file, so its output has no inter-file `--`. When we concatenate the per-file outputs, we need to insert a `--` between files to match the standard multi-file format! In a single `grep -R`, the output has `--` between the last block of file A and the first block of file B. So when concatenating: if the previous file's output is non-empty and the current file's output is non-empty, insert `--\n` in between. Let me double-check grep's behavior: `grep -R foo dir` with matches in two files: ``` dir/a:1:foo -- dir/b:2:foo ``` Yes, `--` between files. And within a file, `--` between separated match blocks. So the concatenation logic: join the non-empty per-file outputs with `--\n`. Also: the trailing newline — each grep output ends with `\n` (if non-empty). Joining with `--\n` gives the correct format. Now, the exit status of the pass-2 greps: each has ≥1 match (k ≥ 1) → exit 0. If a file is unreadable/vanished → exit 2, stderr → error. Handling: if err != nil and (output empty && stderr empty) → that shouldn't happen (k ≥ 1 guarantees a match... unless the file vanished → in that case, grep: exit 2, stderr "No such file or directory" → error). Fine: treat any pass-2 error as a tool error (unlike pass 1, where exit 1 = no matches). Hmm, wait, actually, a subtlety: what if pass 1 says a file has matches, but by the time pass 2 runs, the file has been modified and has fewer matches? -m k just returns fewer; the budget accounting (budget -= k) over-subtracts... we subtract k = min(count, budget), but if the file actually has fewer matches now, we subtracted too much → we might return fewer than N total. Soft-cap, fine. (Race conditions in a live dev container — acceptable.) Now, the "No matches found." path: pass 1 exits 1 with empty output → return "No matches found." (same as now). Pass 1 error (exit 2, bad regex): stderr non-empty → error. Same as now. Now — the tool's description text: "Maximum number of matching lines to return (default: 100)" — global, now true. And the code comment explaining the two-pass approach. Now, let me also reconsider: is there a problem with running pass 1 with `-c` and `--include`? No, -c works fine with --include. Pass 1 with a literal-path target (single file): `grep -Rn -I -H -E -c -e pat /project/foo.go` → output `/project/foo.go:3` (with -H... actually, even without -H, for a single file with -c, grep outputs `file:count`? Let me check: `grep -c foo file` outputs just `3` (no filename) for a single file! With -H, it outputs `file:3`. Since we always pass -H, we get `file:3`. ✓ Good thing we keep -H.) Wait, let me double-check: `echo foo | grep -c foo` → `1`. `grep -c foo somefile` → `1` (no filename). `grep -cH foo somefile` → `somefile:1`. Yes. And with -R on a directory, the filename is always included. So with -H always on, pass 1's output is always `path:count`. ✓ Now, the parse function: ```go // parseGrepCount parses a "path:count" line from grep -c output. // The count is the final colon-separated field, so paths containing // colons parse correctly. func parseGrepCount(line string) (path string, count int, ok bool) { i := strings.LastIndex(line, ":") if i < 0 { return "", 0, false } n, err := strconv.Atoi(line[i+1:]) if err != nil || n < 0 { return "", 0, false } return line[:i], n, true } ``` Now, the main flow: ```go func grepSearch(ctx Context, params grepSearchParams) (string, error) { maxResults := params.MaxResults if maxResults == 0 { maxResults = 100 } // Base flags, shared by both passes. base := []string{"grep", "-Rn", "-I", "-H", "-E"} if !params.CaseSensitive { base = append(base, "-i") } ... } ``` Hmm wait, pass 2 doesn't use -R (single file). Let me structure it: ```go // Pass 1: per-file match counts (grep -c), used to enforce a // global cap on max_results across files. countArgs := append(append([]string{}, base...), "-c") // + include/target/pattern output, stderr, err := ctx.Exec(context.Background(), strings.Join(countArgs, " ")) ... // parse lines into []fileCount if none → "No matches found." // Pass 2: per-file, with context, capped by the remaining budget. var buf strings.Builder budget := maxResults for _, fc := range fileCounts { if budget <= 0 { break } k := fc.count if k > budget { k = budget } args := grep on fc.path with -B -A -m k out, stderr, err := ctx.Exec(...) if err != nil { // A per-file grep should find at least one match; a // failure here means the file disappeared or is unreadable. return "", fmt.Errorf(...) } if out != "" { if buf.Len() > 0 { buf.WriteString("--\n") } buf.WriteString(out) } budget -= k } return buf.String(), nil ``` Wait, but the target/glob handling: pass 1 uses --include or a literal target. Pass 2 uses the file paths from pass 1's output. The glob/target logic applies only to pass 1. Hmm, one question: the order of the flags. The current tests check for the substring `"grep -Rn -I -H -E"` and `--max-count=5`, etc. I'll update the tests anyway. Now, let me reconsider: is the two-pass approach really better than just... hmm, let me sanity-check the cost of Option 2 once more. Actually, wait, I realize I should double-check how ctx.Exec works — is it a shell in the container? Let me look at the Context interface and the real implementation. If Exec runs via some API (e.g., docker exec), multiple calls are fine but each has overhead. Let me look. Also, let me check the `execErr` helper and `shellQuote`, `resolvePath`. Let me read the rest of the tools package.

Let me look at the rest of the tools package and the issue context to understand the full picture.

Tool 🔧 bash {"command":"cd /project && ls internal/tools/ && cat /event | head -50"}

Arguments

{"command":"cd /project && ls internal/tools/ && cat /event | head -50"}

Result

bash.go
context.go
edit-file.go
forgejo.go
grep_search.go
list_files.go
move_file.go
read_file.go
registry.go
remove_file.go
shell.go
tools_test.go
write_file.go
{"id":18,"user":{"id":1,"login":"abrander","login_name":"","source_id":0,"full_name":"Anders Brander","email":"anders@brander.dk","html_url":"https://code.stdio.dk/abrander","avatar_url":"https://code.stdio.dk/avatar/d87ec4c86bb6c9d188d5e32e2424583d","language":"en-US","is_admin":true,"last_login":"2026-08-24T21:07:20+02:00","created":"2025-03-27T21:24:00+01:00","restricted":false,"active":true,"prohibit_login":false,"location":"","website":"","description":"Real human :-)\r\n\r\nI manage all this. Talk to me if you get stuck.","visibility":"limited","followers_count":0,"following_count":0,"starred_repos_count":0},"team":null,"state":"REQUEST_CHANGES","body":"I think you're right. It's matches PER file - that is not what the agent expects. Can we fix that somehow?","commit_id":"41444ddf03fa9ec382a5cb205e89f139bb901222","stale":false,"official":true,"dismissed":false,"comments_count":0,"submitted_at":"2026-08-26T13:57:59+02:00","html_url":"https://code.stdio.dk/abrander/zoo/pulls/69#issuecomment-4951","pull_request_url":"https://code.stdio.dk/abrander/zoo/pulls/69"}

Tool 🔧 grep_search {"context_after":10,"query":"func (c \\*context) Exec|type Context interface|func execErr|func shellQuote|func resolvePath"}

Arguments

{"context_after":10,"query":"func (c \\*context) Exec|type Context interface|func execErr|func shellQuote|func resolvePath"}

Result

/project/internal/tools/context.go:11:type Context interface {
/project/internal/tools/context.go-12-	// Exec runs command inside the run's container via `sh -c` and
/project/internal/tools/context.go-13-	// returns its stdout and stderr as separate strings. A non-zero
/project/internal/tools/context.go-14-	// exit code is an error; the output is still returned so callers
/project/internal/tools/context.go-15-	// can surface it.
/project/internal/tools/context.go-16-	Exec(ctx context.Context, command string) (stdout, stderr string, err error)
/project/internal/tools/context.go-17-
/project/internal/tools/context.go-18-	// Forgejo returns the actions bound to the issue/PR that triggered
/project/internal/tools/context.go-19-	// this run, so tools don't need to be told which repo/issue to act
/project/internal/tools/context.go-20-	// on.
/project/internal/tools/context.go-21-	Forgejo() ForgejoActions
--
/project/internal/tools/shell.go:12:func shellQuote(s string) string {
/project/internal/tools/shell.go-13-	return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
/project/internal/tools/shell.go-14-}
/project/internal/tools/shell.go-15-
/project/internal/tools/shell.go:16:func resolvePath(path string) string {
/project/internal/tools/shell.go-17-	if path == "" {
/project/internal/tools/shell.go-18-		return "/project"
/project/internal/tools/shell.go-19-	}
/project/internal/tools/shell.go-20-
/project/internal/tools/shell.go-21-	if path == "." || path == "./" {
/project/internal/tools/shell.go-22-		return "/project"
/project/internal/tools/shell.go-23-	}
/project/internal/tools/shell.go-24-
/project/internal/tools/shell.go-25-	if strings.HasPrefix(path, "/project/") {
/project/internal/tools/shell.go-26-		return path
--
/project/internal/tools/shell.go:54:func execErr(err error, stdout, stderr string) error {
/project/internal/tools/shell.go-55-	if out := strings.TrimSpace(combineOutput(stdout, stderr)); out != "" {
/project/internal/tools/shell.go-56-		return fmt.Errorf("%w: %s", err, out)
/project/internal/tools/shell.go-57-	}
/project/internal/tools/shell.go-58-
/project/internal/tools/shell.go-59-	return err
/project/internal/tools/shell.go-60-}
/project/internal/tools/shell.go-61-
/project/internal/tools/shell.go-62-func shellReadFile(ctx Context, path string) ([]byte, error) {
/project/internal/tools/shell.go-63-	p := resolvePath(path)
/project/internal/tools/shell.go-64-
--
/project/internal/agentrun/sandboxgit.go:20:func shellQuote(s string) string {
/project/internal/agentrun/sandboxgit.go-21-	return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
/project/internal/agentrun/sandboxgit.go-22-}
/project/internal/agentrun/sandboxgit.go-23-
/project/internal/agentrun/sandboxgit.go-24-// shellGitCmd renders `git <args...>` as one sh -c command line with
/project/internal/agentrun/sandboxgit.go-25-// every argument quoted, for docker exec.
/project/internal/agentrun/sandboxgit.go-26-func shellGitCmd(args ...string) string {
/project/internal/agentrun/sandboxgit.go-27-	parts := make([]string, 0, len(args)+1)
/project/internal/agentrun/sandboxgit.go-28-	parts = append(parts, "git")
/project/internal/agentrun/sandboxgit.go-29-
/project/internal/agentrun/sandboxgit.go-30-	for _, a := range args {

Thinking

OK, so `ctx.Exec` runs `sh -c` inside the container. Multiple calls are fine. Next, let me check the behavior of grep in this container to validate my assumptions: 1. Does `grep -Rc` list files with zero matches? 2. Does `grep -cH` against a single file output `file:count`? 3. Does `-m N` work in combination with `-c`? 4. The `--` separator between files. Let me test these.

Now let me verify grep's behavior for the approach I'm considering (a two-pass design: per-file counts first, then per-file extraction with a global budget):

Tool 🔧 bash {"command":"cd /tmp && rm -rf greptest && mkdir greptest && cd greptest && mkdir -p sub && printf 'foo\\nbar\\nfoo\\nfoo\\n' > a.txt && printf 'foo\\n' > sub/b.txt && printf 'no match here\\n' > c.txt && printf 'foo foo\\n' > 'd with space.txt'\necho \"=== -Rc (does it list zero-count files?) ===\"\ngrep -Rn -I -H -E -c -e foo . ; echo \"exit=$?\"\necho \"=== single file with -H -c ===\"\ngrep -n -I -H -E -c -e foo a.txt ; echo \"exit=$?\"\necho \"=== no matches ===\"\ngrep -Rn -I -H -E -c -e zzz . ; echo \"exit=$?\"\necho \"=== -m 1 -A 1 on a.txt ===\"\ngrep -n -I -H -E -A 1 -m 1 -e foo a.txt ; echo \"exit=$?\""}

Arguments

{"command":"cd /tmp && rm -rf greptest && mkdir greptest && cd greptest && mkdir -p sub && printf 'foo\\nbar\\nfoo\\nfoo\\n' > a.txt && printf 'foo\\n' > sub/b.txt && printf 'no match here\\n' > c.txt && printf 'foo foo\\n' > 'd with space.txt'\necho \"=== -Rc (does it list zero-count files?) ===\"\ngrep -Rn -I -H -E -c -e foo . ; echo \"exit=$?\"\necho \"=== single file with -H -c ===\"\ngrep -n -I -H -E -c -e foo a.txt ; echo \"exit=$?\"\necho \"=== no matches ===\"\ngrep -Rn -I -H -E -c -e zzz . ; echo \"exit=$?\"\necho \"=== -m 1 -A 1 on a.txt ===\"\ngrep -n -I -H -E -A 1 -m 1 -e foo a.txt ; echo \"exit=$?\""}

Result

=== -Rc (does it list zero-count files?) ===
./c.txt:0
./sub/b.txt:1
./d with space.txt:1
./a.txt:3
exit=0
=== single file with -H -c ===
a.txt:3
exit=0
=== no matches ===
./c.txt:0
./sub/b.txt:0
./d with space.txt:0
./a.txt:0
exit=1
=== -m 1 -A 1 on a.txt ===
a.txt:1:foo
a.txt-2-bar
exit=0

Thinking

Confirmed: 1. `grep -Rc` lists all files including those with zero count (`./c.txt:0`). So we need to skip count==0. 2. Single file + `-H -c` → `a.txt:3` (with filename). ✓ 3. No matches → exit 1, but output is not empty (all files listed with :0)! Interesting — so the "no matches" detection can't rely on empty output. We need to check: if all counts are 0 → "No matches found." Wait, this changes the error handling: currently, exit 1 + empty output → "No matches found." In the case of `-c`, exit 1 comes with non-empty output (all zeros). So the logic is: parse the counts, and if the total is 0 → "No matches found." (regardless of exit status). If exit status is 2 (or non-zero with stderr) → error. Hmm, wait, but what about exit 1 with some files having matches? That can't happen — if there's even one match, exit is 0. 4. `-m 1 -A 1` works as expected. Note the order of -Rc output: `./c.txt`, `./sub/b.txt`, `./d with space.txt`, `./a.txt` — this is directory traversal order (readdir order, not sorted). The per-file greps in pass 2 run in this same order, so the final output order matches what a single `grep -R` would produce. Good — consistent with previous behavior. Also note: paths are relative to the target (here `.`). In the tool, the target is `/project` (absolute path), so paths will be `/project/...`. ✓ Now, another check: does the order of `grep -R` (without -c) match the order of `grep -Rc`? Both should use the same traversal. Let me verify quickly. Also, check the `--` separator between files in a normal -R run, and confirm the exact output format for the concatenation logic. Also: what about a file with a colon in its name? `grep -Rc` outputs `path:count` — parsing via LastIndex(":") works even if the path contains a colon. ✓ (The count is always at the end, digits only.) Let me verify the order match and the separator format.

I've confirmed the key behaviors: `-c` lists all files including zero counts, and `-H` keeps the filename even for a single file. Next, I'll verify that the traversal order matches between the count pass and the normal pass, as well as the exact separator format:

Tool 🔧 bash {"command":"cd /tmp/greptest && echo \"=== normal -R order ===\" && grep -Rn -I -H -E -e foo . ; echo \"exit=$?\"\necho \"=== per-file greps in count order, joined with -- ===\"\nfor f in ./c.txt ./sub/b.txt ./d\\ with\\ space.txt ./a.txt; do :; done\ngrep -n -I -H -E -e foo ./sub/b.txt; echo \"--\"; grep -n -I -H -E -e foo 'd with space.txt'; echo \"--\"; grep -n -I -H -E -e foo ./a.txt"}

Arguments

{"command":"cd /tmp/greptest && echo \"=== normal -R order ===\" && grep -Rn -I -H -E -e foo . ; echo \"exit=$?\"\necho \"=== per-file greps in count order, joined with -- ===\"\nfor f in ./c.txt ./sub/b.txt ./d\\ with\\ space.txt ./a.txt; do :; done\ngrep -n -I -H -E -e foo ./sub/b.txt; echo \"--\"; grep -n -I -H -E -e foo 'd with space.txt'; echo \"--\"; grep -n -I -H -E -e foo ./a.txt"}

Result

=== normal -R order ===
./sub/b.txt:1:foo
./d with space.txt:1:foo foo
./a.txt:1:foo
./a.txt:3:foo
./a.txt:4:foo
exit=0
=== per-file greps in count order, joined with -- ===
./sub/b.txt:1:foo
--
d with space.txt:1:foo foo
--
./a.txt:1:foo
./a.txt:3:foo
./a.txt:4:foo

Thinking

Interesting! The traversal order of `grep -Rc` was `./c.txt, ./sub/b.txt, ./d with space.txt, ./a.txt`, but the order of the normal `grep -R` is `./sub/b.txt, ./d with space.txt, ./a.txt` (c.txt excluded because it has no matches). Wait, these are different! In the -c run, c.txt came first, then sub/b.txt, d, a. In the normal run: sub/b.txt, d, a. So the relative order of the matched files is the same (sub/b.txt, d with space, a.txt) — c.txt (zero matches) was just listed first in the -c run. Hmm, is the traversal order really the same, and the only difference is that c.txt was listed first in the -c run? Hmm, wait: -c order: c.txt, sub/b.txt, d, a. Normal order: sub/b.txt, d, a. If the traversal order were identical, c.txt should appear in the same relative position in both. In the -c run c.txt is first, but in the normal run the first matched file is sub/b.txt. If the traversal were [c.txt, sub/b.txt, d, a], then the normal run should output sub/b.txt, d, a (c.txt filtered out) — which is exactly what we see. So the traversal order is [c.txt, sub/b.txt, d, a] in both, and the -c run just includes the zero-match file. ✓ The relative order of matched files is preserved. Hmm, but wait — is that guaranteed? The traversal order of grep -R is readdir order, which is stable for the same directory state. Both runs happen milliseconds apart, so the order should be identical. There's a slight theoretical race (if files are added between the two runs) — a new file appearing between pass 1 and pass 2 simply won't be searched (no problem, we're just capping results, and the results are a snapshot anyway). A file deleted between passes → pass 2's grep errors out. Edge case, acceptable (I'll handle it with a clear error). Actually, hmm, wait. Let me reconsider: is it really guaranteed that grep's -R traversal order is the same across two invocations? readdir order depends on the filesystem, and for the same directory contents it's deterministic (ext4: hash order; tmpfs: insertion order). Yes, for the same contents it's stable. And the container's /project is a stable directory. Good. But actually — do we even need the order to match a single grep's order? The order just needs to be deterministic and reasonable. Even if it differed slightly from a single grep's order, the results would still be correct (the first N matches in some file order). But matching the previous behavior is preferable. It matches. ✓ Now, the `--` separator: in a single grep -R run, is there a `--` between files? Let me check: in the normal -R output above, there's no `--` between files! Look: ``` ./sub/b.txt:1:foo ./d with space.txt:1:foo foo ./a.txt:1:foo ``` No `--` between files! Because... hmm. grep only outputs `--` between files when there's context (-A/-B)? No wait — actually, grep outputs `--` between files in multi-file mode... let me check the man page: "grep ... -- ... separates the output of different files by a line containing only --". Hmm, but in the output above there's no `--` between sub/b.txt and d with space.txt! Oh wait — I think grep only outputs `--` between files when using -A/-B (context)? No... let me test. Actually, from the GNU grep docs: "--max-count=NUM ... -A, -B, -C context ... When a non-empty context range is given, grep normally prints a group of context lines..." And the `--` separator: "grep prints a line containing only -- before the first matching line of each file" — hmm, no. Let me look at the actual behavior: in the output above, there's no `--` between files without context. Let me test with -A 1 to see where the `--` appears.

Interesting — no `--` between files without context. Let me check where `--` separators appear with context flags:

Tool 🔧 bash {"command":"cd /tmp/greptest && echo \"=== -R with -A 1 ===\" && grep -Rn -I -H -E -A 1 -e foo . ; echo \"exit=$?\"\necho \"=== single file -A 1 -B 1 (a.txt: matches 1,3,4 -> merged blocks) ===\"\ngrep -n -I -H -E -A 1 -B 1 -e foo a.txt ; echo \"exit=$?\"\necho \"=== two separate files, -A 1 ===\"\ngrep -n -I -H -E -A 1 -e foo sub/b.txt a.txt"}

Arguments

{"command":"cd /tmp/greptest && echo \"=== -R with -A 1 ===\" && grep -Rn -I -H -E -A 1 -e foo . ; echo \"exit=$?\"\necho \"=== single file -A 1 -B 1 (a.txt: matches 1,3,4 -> merged blocks) ===\"\ngrep -n -I -H -E -A 1 -B 1 -e foo a.txt ; echo \"exit=$?\"\necho \"=== two separate files, -A 1 ===\"\ngrep -n -I -H -E -A 1 -e foo sub/b.txt a.txt"}

Result

=== -R with -A 1 ===
./sub/b.txt:1:foo
--
./d with space.txt:1:foo foo
--
./a.txt:1:foo
./a.txt-2-bar
./a.txt:3:foo
./a.txt:4:foo
exit=0
=== single file -A 1 -B 1 (a.txt: matches 1,3,4 -> merged blocks) ===
a.txt:1:foo
a.txt-2-bar
a.txt:3:foo
a.txt:4:foo
exit=0
=== two separate files, -A 1 ===
sub/b.txt:1:foo
--
a.txt:1:foo
a.txt-2-bar
a.txt:3:foo
a.txt:4:foo

Thinking

Now I've got the full picture of the output format: 1. Without context: no `--` between files. 2. With context (`-A`/`-B`): a `--` appears between files, and also between separated match blocks within a file. 3. Merged blocks: adjacent matches (within the context range) form a single block with no `--` between them — e.g., matches on lines 1, 3, 4 with -A 1 -B 1 become one block: `1:foo, 2-bar, 3:foo, 4:foo`. Note that there's no `--` between `a.txt:3:foo` and `a.txt:4:foo`. So the format is: `--` appears between "groups" (blocks), and blocks can contain multiple matches. This corroborates my earlier analysis that block-counting can't be used for exact match counting (merged blocks). Therefore, for the concatenation in pass 2, the separator rules are: - When context is enabled (B>0 or A>0): join per-file outputs with `--`. - Without context: no separator between files (matches single-grep behavior). Wait, let me double-check the no-context case: in a single grep -R without context, files are simply concatenated with no separator. ✓ (from the earlier test). Hmm, and what about the case where context is enabled but a file has only one match block? The `--` only appears between blocks/files, not after the last block. So joining non-empty per-file outputs with `--\n` exactly reproduces the single-grep format. ✓ Edge case: what if a per-file grep's output is empty (k≥1 but the file changed between passes and no longer matches)? In that case, grep exits 1 with empty output. We skip it (don't add a separator). The budget accounting subtracts k anyway (or should it subtract the actual count? We don't know the actual count… the output is empty → 0 matches. We could parse… no, let's keep it simple: subtract k. This is a rare race, and the cap is soft). Hmm, actually, wait: if a file no longer has matches, grep exits 1 with empty output — is that an "error"? In pass 2, we should treat "exit 1 + empty output + empty stderr" as "no matches (file changed)" and skip, not as a hard error. That's more robust. Other non-zero exits (2) → hard error. OK, let me also double-check `-m k` with `-c`… no wait, pass 1 doesn't use -m. Should pass 1 use -m? No — we need the full per-file count to compute the budget. Without -m, the count is the true total per file. ✓ One more consideration for pass 1: performance. `grep -Rc` reads every file (same as a normal search). No problem. Now — one more design question: should pass 1 include `-B`/`-A`? No, they're irrelevant with -c (grep ignores context with -c… actually, does it? `grep -c -A 1` — I think -c suppresses context output entirely. Let's not pass them. Cleaner.) OK, let me write the implementation. ```go package tools import ( "context" "fmt" "strconv" "strings" "github.com/abrander/zoo/internal/llm" ) type grepSearchParams struct { Pattern string `json:"query"` Glob string `json:"glob"` CaseSensitive bool `json:"case_sensitive"` ContextBefore int `json:"context_before"` ContextAfter int `json:"context_after"` MaxResults int `json:"max_results"` } func init() { tool := llm.NewTool( "grep_search", "Search for an extended regular expression (ERE, e.g. 'foo|bar', 'func\\(') in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.") tool.AddStringProperty("query", "The regex pattern to search for", true) tool.AddStringProperty("glob", "Optional glob pattern to filter files, e.g. '*.go'. A literal file path without wildcards, e.g. 'internal/store/store.go', is searched directly", false) tool.AddBooleanProperty("case_sensitive", "Whether the search should be case sensitive (default: false)", false) tool.AddIntegerProperty("context_before", "Number of lines of context to show before each match (default: 0)", false) tool.AddIntegerProperty("context_after", "Number of lines of context to show after each match (default: 0)", false) tool.AddIntegerProperty("max_results", "Maximum number of matching lines to return in total, across all files (default: 100)", false) Register(tool, grepSearch) } ``` Now the main function. Let me draft it: ```go func grepSearch(ctx Context, params grepSearchParams) (string, error) { maxResults := params.MaxResults if maxResults == 0 { maxResults = 100 } // -E makes grep interpret the pattern as an extended regular // expression (ERE), which is the "real" regex flavor the tool // promises: |, +, ?, (), {} all work as metacharacters. Without // it, grep falls back to BRE, where those are treated literally. // -H keeps the filename in the output even when the search target // is a single file, so results look the same as directory searches. base := []string{"grep", "-Rn", "-I", "-H", "-E"} if !params.CaseSensitive { base = append(base, "-i") } // By default the search target is the whole project. grep's // --include matches basenames against a glob, so a literal file // path (no wildcards) passed as the glob would never match; // treat such values as a path and search that file directly. target := "/project" if params.Glob != "" { if isGlobPattern(params.Glob) { base = append(base, "--include="+shellQuote(params.Glob)) } else { target = resolvePath(params.Glob) } } base = append(base, "-e", shellQuote(params.Pattern), shellQuote(target)) // max_results is a global cap on matching lines, but grep can only // count per file (--max-count). So the search runs in two passes: // first count the matches in each file, then extract them file by // file, stopping once the total budget is spent. Files are visited // in the same order grep's -R traversal reported, so results come // out in the same order a single grep run would produce. counts, err := grepFileCounts(ctx, base) if err != nil { return "", err } var ( budget = maxResults out strings.Builder ) for _, fc := range counts { if budget <= 0 { break } n := fc.count if n > budget { n = budget } args := append(append([]string{}, base...), contextArgs(params)...) // hmm, need -B/-A ... } } ``` Hmm, wait, I'm getting confused. Let me restructure. The base args differ between passes: Pass 1: `grep -Rn -I -H -E [-i] [--include=glob] -c -e pattern target` Pass 2: `grep -n -I -H -E [-i] [-B b] [-A a] -m k -e pattern file` Common core: `grep -I -H -E [-i]` + pattern + target. Differences: pass 1 has `-R` + `-c` + optional `--include`; pass 2 has `-n` + `-B/-A` + `-m k`. Let me write a helper that builds the common part: ```go // grepBaseArgs returns the flags shared by both passes: extended // regex, filename in output, skip binary files, case sensitivity. func grepBaseArgs(caseSensitive bool) []string { args := []string{"grep", "-I", "-H", "-E"} if !caseSensitive { args = append(args, "-i") } return args } ``` Pass 1: ```go args := append(grepBaseArgs(params.CaseSensitive), "-R", "-c") if params.Glob != "" && isGlobPattern(params.Glob) { args = append(args, "--include="+shellQuote(params.Glob)) } target := "/project" if params.Glob != "" && !isGlobPattern(params.Glob) { target = resolvePath(params.Glob) } args = append(args, "-e", shellQuote(params.Pattern), shellQuote(target)) ``` Hmm, the glob/target logic — let me keep it as one block like the current code. Pass 2 (per file): ```go args := append(grepBaseArgs(params.CaseSensitive), "-n") if params.ContextBefore > 0 { args = append(args, "-B", strconv.Itoa(params.ContextBefore)) } if params.ContextAfter > 0 { args = append(args, "-A", strconv.Itoa(params.ContextAfter)) } args = append(args, "-m", strconv.Itoa(n), "-e", shellQuote(params.Pattern), shellQuote(fc.path)) ``` Wait, the current code uses `--max-count=N` (single-dash long form). Either is fine. Should I use `--max-count=` for consistency with the PR… or `-m`? The existing tests check for `--max-count=5`. I'm rewriting the tests anyway. Let me use `-m` — shorter, and it's the classic form. Hmm, actually, let me keep `--max-count=` for consistency with the existing PR's style. Either works. I'll go with `-m` for brevity. Hmm — no strong preference. Let's go with `-m`. Wait, actually, one important detail: in pass 2, `-n` — line numbers. Without -n, grep -H outputs `path:content` without a line number, which would break the format. So -n is required. ✓ (Pass 1 has -R, and -c doesn't output line numbers anyway. -n is harmless, but let me include it only where needed: pass 2.) Hmm, wait, actually in pass 1 with -c, the -n flag is irrelevant. Let me not include -n in pass 1. Now, the count parsing: ```go type fileCount struct { path string count int } // parseCountLine parses one "path:count" line from grep -c output. // The count is the last colon-separated field, so paths that // themselves contain colons still parse correctly. func parseCountLine(line string) (fileCount, bool) { i := strings.LastIndex(line, ":") if i < 0 { return fileCount{}, false } n, err := strconv.Atoi(line[i+1:]) if err != nil || n <= 0 { return fileCount{}, false } return fileCount{path: line[:i], count: n}, true } ``` n <= 0: skip zero counts (grep -c lists non-matching files with :0). grepFileCounts: ```go // grepFileCounts runs the first pass: grep -c over the search target, // returning the number of matching lines per file, in traversal order. func grepFileCounts(ctx Context, args []string) ([]fileCount, error) { output, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " ")) if err != nil { // grep exits 1 when nothing matches; with -c that still // prints a ":0" line per file, so fall through and let the // parsed counts decide. Any other failure is a real error. if strings.TrimSpace(stderr) != "" { return nil, fmt.Errorf("grep_search: %w", execErr(err, output, stderr)) } } var counts []fileCount for _, line := range strings.Split(strings.TrimRight(output, "\n"), "\n") { if line == "" { continue } if fc, ok := parseCountLine(line); ok { counts = append(counts, fc) } } if len(counts) == 0 { return nil, nil } return counts, nil } ``` Hmm, wait, be careful with the error handling. Current behavior: - exit 1 (no matches): output empty, stderr empty → "No matches found." - exit 2 (error, e.g., bad regex): stderr non-empty → error. With -c: - exit 1 (no matches): output = all files with :0, stderr empty → parse → no counts with n>0 → "No matches found." ✓ - exit 2 (bad regex): stderr non-empty → error. ✓ - exit 0: counts present. ✓ But what if err != nil (exit 1) AND stderr is non-empty? E.g., some files unreadable (exit 2) — stderr non-empty → error. ✓. What about exit 1 with warnings on stderr? Unlikely. Let me treat "stderr non-empty" as an error regardless of exit code. Hmm, but wait: could stderr be non-empty on a successful grep (exit 0)? E.g., "grep: warning: ..."? Rare. The current code only checks stderr when err != nil. Let me keep the same structure: check stderr only when err != nil. If err != nil and stderr empty → parse the output (the :0 case). If err != nil and stderr non-empty → error. Wait, but there's a subtlety: exit 1 with -c — is stderr always empty? Yes, normally. OK. Now the main flow: ```go func grepSearch(ctx Context, params grepSearchParams) (string, error) { maxResults := params.MaxResults if maxResults == 0 { maxResults = 100 } // ... build pass-1 args ... counts, err := grepFileCounts(ctx, countArgs) if err != nil { return "", err } if len(counts) == 0 { return "No matches found.", nil } // Second pass: extract matches file by file, spending the global // budget. hasContext := params.ContextBefore > 0 || params.ContextAfter > 0 var ( budget = maxResults out strings.Builder ) for _, fc := range counts { if budget <= 0 { break } n := fc.count if n > budget { n = budget } args := grepBaseArgs(params.CaseSensitive) args = append(args, "-n") if params.ContextBefore > 0 { args = append(args, "-B", strconv.Itoa(params.ContextBefore)) } if params.ContextAfter > 0 { args = append(args, "-A", strconv.Itoa(params.ContextAfter)) } args = append(args, "-m", strconv.Itoa(n), "-e", shellQuote(params.Pattern), shellQuote(fc.path)) fileOut, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " ")) if err != nil { // The file should still match (pass one just counted it), // so a failure means it vanished or became unreadable in // the meantime — skip it rather than failing the search. if strings.TrimSpace(fileOut) == "" && strings.TrimSpace(stderr) == "" { continue } return "", fmt.Errorf("grep_search: %w", execErr(err, fileOut, stderr)) } if fileOut == "" { continue } if out.Len() > 0 && hasContext { out.WriteString("--\n") } out.WriteString(fileOut) budget -= n } return out.String(), nil } ``` Hmm, wait — the "skip if it vanished" logic: if the file vanished, grep exits 2 with stderr "No such file or directory" → stderr non-empty → hard error. If the file changed and no longer matches: exit 1, empty output, empty stderr → skip. OK, that's what the code does. Hmm, but is it right to hard-error on a vanished file? The current single-grep behavior: if a file vanishes mid-run, grep exits 2 with a diagnostic → error. So same behavior. Fine. Wait, one more thing: `budget -= n` — n is the number of matches we asked for (min(count, budget)). If the file actually returned fewer (race), the budget is over-subtracted. Soft cap, fine. Now — hmm, wait. Let me reconsider the `hasContext` separator logic. In a single grep -R with context, `--` appears between files. Without context, it doesn't. My concatenation: join with `--\n` only when hasContext. ✓ matches the observed format. But wait — what about a file with multiple blocks (context within a file)? The per-file grep's output already includes the internal `--` separators. ✓ (grep handles that per file.) Edge case: fileOut non-empty but budget… no, n ≥ 1 is always true (counts are filtered to n>0, and n = min(count, budget) with budget ≥ 1). ✓ Now, the final output: does each per-file grep's output end with a newline? Yes, grep terminates each line with \n. So the concatenation is clean. The final output ends with \n. The current implementation returns grep's raw output (which also ends with \n). ✓ Now, the "No matches found." case: pass 1 with -c, exit 1, all :0 → counts empty → "No matches found." ✓ What about a bad regex? Pass 1: exit 2, stderr "grep: Trailing backslash" etc. → error with execErr. ✓ (Note: pass 1 runs first, so bad regexes fail fast before any per-file work.) Now, let me reconsider: is there any issue with `-I` (skip binaries) in pass 1 vs pass 2? Both use -I. ✓ Consistent. What about `--include` in pass 2? Not needed — the file list already reflects the filter. ✓ Now, the tool description for max_results: "Maximum number of matching lines to return in total, across all files (default: 100)". Hmm, should I keep the phrasing closer to the original? The original (pre-PR) was: "Maximum number of matching lines to return (default: 100)". The PR changed it to "per file". Now it's truly global, so let me restore the global phrasing. Let me write it as: "Maximum number of matching lines to return in total, across all files (default: 100)". Now, the tests. The fakeContext needs to support multiple Exec calls with different responses. Let me extend it: ```go type fakeContext struct { lastCmd string cmds []string stdout string stderr string err error // responses, if set, are returned one per Exec call (in order); // once exhausted, the last response repeats. responses []execResponse fg *fakeForgejoActions } type execResponse struct { stdout string stderr string err error } ``` Hmm, but existing tests use the `stdout`/`stderr`/`err` fields directly. I can keep those as the default response when `responses` is empty. Let me write it: ```go func (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) { f.lastCmd = command f.cmds = append(f.cmds, command) if len(f.responses) == 0 { return f.stdout, f.stderr, f.err } i := len(f.responses) - 1 if i >= len(f.responses) { i = len(f.responses) - 1 } r := f.responses[i] return r.stdout, r.stderr, r.err } ``` Wait, indexing: the first call uses responses[0], the second responses[1], etc. Once exhausted, repeat the last one. Let me write it: ```go func (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) { f.lastCmd = command f.cmds = append(f.cmds, command) if len(f.responses) > 0 { i := len(f.cmds) - 1 if i >= len(f.responses) { i = len(f.responses) - 1 } r := f.responses[i] return r.stdout, r.stderr, r.err } return f.stdout, f.stderr, f.err } ``` Now the tests: 1. `TestGrepSearchUsesExtendedRegex` — single response, still works (pass 1 returns a count line, pass 2 returns the match). Wait — this test sets `stdout: "/project/foo.go:1:foo|bar\n"` and expects the output to contain "foo|bar". With the two-pass flow: pass 1 receives that stdout → parseCountLine("/project/foo.go:1:foo|bar") → LastIndex(":") → the last colon is before "foo|bar"? The line is `/project/foo.go:1:foo|bar`. LastIndex(":") → the position of the colon before `foo|bar`. Atoi("foo|bar") fails → not a count → counts empty → "No matches found." → the test fails (it expects the output to contain "foo|bar"). So I need to update this test to provide two responses: pass 1 → `/project/foo.go:1\n`, pass 2 → `/project/foo.go:1:foo|bar\n`. And assert lastCmd contains "grep -I -H -E"… wait, the assertion is `strings.Contains(fc.lastCmd, "grep -Rn -I -H -E")` — lastCmd is now the pass-2 command (no -R). I need to update the assertion: check that the first command (fc.cmds[0]) contains "grep -R" and "-c", and that the last command contains "-E". Let me restructure the assertions to use fc.cmds. 2. `TestGrepSearchLiteralPathSearchesFileDirectly` — same treatment: responses: pass 1 → `/project/internal/store/store.go:1\n`, pass 2 → the match line. Assertions: no --include, the command targets the literal path (both passes target it — pass 1's target is the file, pass 2's target is the file from the count line), -A 4 is in pass 2. 3. `TestGrepSearchGlobStillUsesInclude` — responses: pass 1 → `/project/foo.go:1\n`, pass 2 → `/project/foo.go:1:foo\n`. Assertions: cmds[0] contains `--include='*.go'` and targets /project. 4. `TestGrepSearchLimitsMatchesNotLines` → rename/replace with a test for the global cap: - Pass 1: counts for two files, e.g., `/project/a.go:3\n/project/b.go:3\n` (6 matches total). - max_results=4 → pass 2: a.go with -m 4, then b.go with -m 0? No wait: budget=4, a.go count=3 → n=3, budget→1; b.go count=3 → n=1, budget→0; stop. - Assert: cmds[2] (a.go) contains `-m 3`, cmds[3] (b.go) contains `-m 1`, and no further commands (len(cmds)==3). - Also assert that the output is the concatenation of the two responses. Let me design it: - responses[0] (pass 1): `/project/a.go:3\n/project/b.go:3\n` - responses[1] (a.go): `a.go out` — realistic: `/project/a.go:1:x\n/project/a.go:2:x\n/project/a.go:3:x\n` - responses[2] (b.go): `/project/b.go:1:x\n/project/b.go:2:x\n/project/b.go:3:x\n` - With MaxResults=4: a.go gets -m 3 (all 3), b.go gets -m 1. - Assert len(fc.cmds) == 3, cmds[1] contains `-m 3` and `/project/a.go`, cmds[2] contains `-m 1` and `/project/b.go`. - Output = a.go's output + b.go's output (no context → no `--` separator). 5. `TestGrepSearchDefaultMaxResults` — omitted max_results → default 100. Pass 1: `/project/foo.go:5\n` → pass 2 with `-m 5` (count 5 < budget 100 → -m 5). Hmm, this test used to assert `--max-count=100`. Now the default manifests as the budget: if the file has 5 matches, -m 5. To test the default of 100, I need a file with more than 100 matches: count 150 → -m 100. Let me do this: pass 1 → `/project/foo.go:150\n`, expect pass 2 to contain `-m 100`. 6. New test: global cap stops at the budget across files (the main one from #4). 7. New test: context separator — with ContextAfter, the per-file outputs are joined with `--`. E.g., two files, counts 1 and 1, MaxResults 2 (or default), responses with context lines → output contains `--` between the files. 8. `TestGrepSearchNoMatches` — currently: `fc := &fakeContext{err: fmt.Errorf("exit status 1")}` (no stdout). Pass 1: err, empty output, empty stderr → parse → no counts → "No matches found." ✓ Still works with the single default response. 9. New test: pass 1 error (bad regex) → error. `fc := &fakeContext{stderr: "grep: invalid regex", err: errors.New("exit status 2")}` → expect an error. Also, I should double-check: `TestGrepSearchLimitsMatchesNotLines` asserted "no head in the command" — keep that assertion (no head anywhere). Now — one more important design review. The two-pass approach means the common case (search with matches in a few files) now spawns 2+ processes instead of 1. Is that acceptable? For a dev tool used by an agent, yes. And it's the price of an exact global cap. Hmm, wait. Actually, let me reconsider one more time whether there's a simpler exact approach… What about a single pass with `-m N` per file, plus a second `-c` pass to get the exact total, and if the total ≤ N return the full output (no truncation), otherwise… we still need to truncate. No good. What about a single pass with `-m N` per file, plus a second `-c` pass to get the exact total, and if the total ≤ N return the full output (no truncation), otherwise fall back to the two-pass budget approach? That's an optimization that adds complexity. No. Two-pass it is. Actually, hmm, wait — one more idea, the simplest exact approach: **Single pass, per file, but get the file list + counts in one grep, and do the extraction in a shell loop?** No — Go orchestration is cleaner and testable. OK, let me also reconsider the naming and structure for readability. Let me write the final code: ```go package tools import ( "context" "fmt" "strconv" "strings" "github.com/abrander/zoo/internal/llm" ) type grepSearchParams struct { Pattern string `json:"query"` Glob string `json:"glob"` CaseSensitive bool `json:"case_sensitive"` ContextBefore int `json:"context_before"` ContextAfter int `json:"context_after"` MaxResults int `json:"max_results"` } func init() { tool := llm.NewTool( "grep_search", "Search for an extended regular expression (ERE, e.g. 'foo|bar', 'func\\(') in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.") tool.AddStringProperty("query", "The regex pattern to search for", true) tool.AddStringProperty("glob", "Optional glob pattern to filter files, e.g. '*.go'. A literal file path without wildcards, e.g. 'internal/store/store.go', is searched directly", false) tool.AddBooleanProperty("case_sensitive", "Whether the search should be case sensitive (default: false)", false) tool.AddIntegerProperty("context_before", "Number of lines of context to show before each match (default: 0)", false) tool.AddIntegerProperty("context_after", "Number of lines of context to show after each match (default: 0)", false) tool.AddIntegerProperty("max_results", "Maximum number of matching lines to return in total, across all files (default: 100)", false) Register(tool, grepSearch) } // grepSearch searches for a pattern and caps the total number of // matching lines at max_results, across all files. // // grep can only cap matches per file (--max-count), so the search // runs in two passes: first count the matches in each file, then // extract them file by file, spending a global budget of max_results // matches. Files are visited in the order grep's recursive traversal // reported them, so the results come out in the same order a single // grep run would produce. func grepSearch(ctx Context, params grepSearchParams) (string, error) { maxResults := params.MaxResults if maxResults == 0 { maxResults = 100 } // -E makes grep interpret the pattern as an extended regular // expression (ERE), which is the "real" regex flavor the tool // promises: |, +, ?, (), {} all work as metacharacters. Without // it, grep falls back to BRE, where those are treated literally. // -H keeps the filename in the output even when the search target // is a single file, so results look the same as directory searches. // -I skips binary files. base := []string{"grep", "-I", "-H", "-E"} if !params.CaseSensitive { base = append(base, "-i") } // By default the search target is the whole project. grep's // --include matches basenames against a glob, so a literal file // path (no wildcards) passed as the glob would never match; // treat such values as a path and search that file directly. target := "/project" if params.Glob != "" { if isGlobPattern(params.Glob) { base = append(base, "--include="+shellQuote(params.Glob)) } else { target = resolvePath(params.Glob) } } base = append(base, "-e", shellQuote(params.Pattern), shellQuote(target)) // Pass one: how many lines match in each file. countArgs := append(append([]string{}, base...), "-R", "-c") counts, err := grepFileCounts(ctx, countArgs) if err != nil { return "", err } if len(counts) == 0 { return "No matches found.", nil } // Pass two: extract the matches, file by file, until the budget // of max_results matching lines is spent. hasContext := params.ContextBefore > 0 || params.ContextAfter > 0 var ( budget = maxResults out strings.Builder ) for _, fc := range counts { if budget <= 0 { break } n := fc.count if n > budget { n = budget } args := append(append([]string{}, base[:len(base)-2]...), "-n") ... } } ``` Hmm, wait, `base` ends with `-e pattern target` — for pass 2 I want to replace `target` with the file path. Let me restructure: build `base` without the pattern/target, and append them per pass: ```go // Common flags for both passes. base := []string{"grep", "-I", "-H", "-E"} if !params.CaseSensitive { base = append(base, "-i") } if params.Glob != "" && isGlobPattern(params.Glob) { base = append(base, "--include="+shellQuote(params.Glob)) } // Pass one: count matching lines per file over the search target. target := "/project" if params.Glob != "" && !isGlobPattern(params.Glob) { target = resolvePath(params.Glob) } countArgs := append(append([]string{}, base...), "-R", "-c", "-e", shellQuote(params.Pattern), shellQuote(target)) ``` Wait, but --include in pass 2 is harmless but unnecessary… actually, it's fine to leave --include in pass 2 (the file is a specific path, and --include filters by basename — the file already matched the filter, so it passes again). But it's cleaner to not pass it. Hmm, but if I build `base` including --include, pass 2 inherits it. Let me keep --include out of the shared base and add it only to pass 1: ```go base := []string{"grep", "-I", "-H", "-E"} if !params.CaseSensitive { base = append(base, "-i") } target := "/project" if params.Glob != "" { if isGlobPattern(params.Glob) { // grep's --include matches basenames against a glob. target stays /project } else { target = resolvePath(params.Glob) } } // Pass one: ... countArgs := append(append([]string{}, base...), "-R", "-c") if params.Glob != "" && isGlobPattern(params.Glob) { countArgs = append(countArgs, "--include="+shellQuote(params.Glob)) } countArgs = append(countArgs, "-e", shellQuote(params.Pattern), shellQuote(target)) ``` Hmm, the glob check is duplicated. Let me use a boolean: ```go globFilter := params.Glob != "" && isGlobPattern(params.Glob) target := "/project" if params.Glob != "" && !globFilter { target = resolvePath(params.Glob) } ``` Clean. Pass 2 per file: ```go args := append(append([]string{}, base...), "-n") if params.ContextBefore > 0 { args = append(args, "-B", strconv.Itoa(params.ContextBefore)) } if params.ContextAfter > 0 { args = append(args, "-A", strconv.Itoa(params.ContextAfter)) } args = append(args, "-m", strconv.Itoa(n), "-e", shellQuote(params.Pattern), shellQuote(fc.path)) ``` Wait — `append(append([]string{}, base...), ...)` — the base slice is reused across iterations. I need a fresh copy each time to avoid aliasing corruption. `append([]string{}, base...)` makes a fresh copy. ✓ (The current code builds args fresh each call, so no issue.) Hmm, actually, since base is never modified after construction, I could do `args := make([]string, 0, len(base)+8); args = append(args, base...)`. Same thing. Let me use the explicit fresh-slice idiom. Now, `grepFileCounts`: ```go // fileCount is the number of matching lines in one file, as reported // by the counting pass. type fileCount struct { path string count int } // grepFileCounts runs the counting pass (grep -Rc) and returns the // files with at least one match, in traversal order. func grepFileCounts(ctx Context, args []string) ([]fileCount, error) { output, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " ")) if err != nil && strings.TrimSpace(stderr) != "" { return nil, fmt.Errorf("grep_search: %w", execErr(err, output, stderr)) } var counts []fileCount for _, line := range strings.Split(output, "\n") { if fc, ok := parseCountLine(line); ok { counts = append(counts, fc) } } return counts, nil } ``` Wait: err != nil with empty stderr → the "no matches" case (exit 1, all :0 lines) → parse the output → counts empty → the caller returns "No matches found." ✓. err == nil → parse. ✓. err != nil with non-empty stderr → error ✓. Hmm, but what about err == nil with stderr non-empty (warnings)? Ignore, same as the current code. parseCountLine: ```go // parseCountLine parses one "path:count" line from grep -c output. // The count is the last colon-separated field, so paths containing // colons still parse; lines without a numeric count (including the // ":0" lines grep -c prints for non-matching files) are rejected. func parseCountLine(line string) (fileCount, bool) { i := strings.LastIndex(line, ":") if i < 0 { return fileCount{}, false } n, err := strconv.Atoi(line[i+1:]) if err != nil || n <= 0 { return fileCount{}, false } return fileCount{path: line[:i], count: n}, true } ``` Edge case: a line like `path:` (empty count) → Atoi("") errors → rejected ✓. A line with no colon → rejected ✓ (defensive). Now, let me re-verify the pass-2 error handling in the main loop: ```go fileOut, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " ")) if err != nil { // Pass one just counted matches in this file, so it // should still match; an empty result means the file // changed in the meantime and is skipped. Anything else // (e.g. the file vanished) is a real error. if strings.TrimSpace(fileOut) == "" && strings.TrimSpace(stderr) == "" { continue } return "", fmt.Errorf("grep_search: %w", execErr(err, fileOut, stderr)) } ``` Hmm, wait, `continue` skips `budget -= n` — good (no matches were returned). But hmm, one issue: if the file changed and now has fewer matches than the count, grep still exits 0 (there are matches, just fewer) → fileOut non-empty → append, budget -= n (over-subtraction, fine). Now, assembling the output: ```go if fileOut == "" { continue } if out.Len() > 0 && hasContext { // grep separates the output of different files with a // "--" line when context lines are in play. out.WriteString("--\n") } out.WriteString(fileOut) budget -= n ``` Wait, `fileOut == ""` — can fileOut be non-empty but whitespace? grep's output lines are real lines. If there are matches, it's non-empty. Use `fileOut == ""`. Hmm, what if grep outputs nothing but exits 0? Impossible with -m n≥1 and a match… except in the race case → in that case it's exit 1 (handled above). OK. Actually, wait, one more subtlety: `budget -= n` should only happen when we actually appended. In the code above, the `continue` paths skip it. ✓ And the final return: `return out.String(), nil`. Can out be empty at the end? Only if all per-file greps returned nothing (all raced) → return "" → hmm, that's weird. Let me add a guard: if out.Len() == 0 → "No matches found." Defensive. Now, let me reconsider the tool's description once more: "Maximum number of matching lines to return in total, across all files (default: 100)". Good. Now — the PR body's "Note" section said the per-file behavior was "the behavior the issue asked for" — let me re-read issue #68 to confirm the global cap is what was asked for. Let me fetch the issue. I don't have a direct API… the event is a PR review. The PR body says "Fixes #68". Let me check if there's a way to read the issue — maybe via git or the forge. Actually, the reviewer's comment is the authority: "It's matches PER file - that is not what the agent expects. Can we fix that somehow?" — clear: make it global. Now, the tests. Let me rewrite the grep tests in tools_test.go: ```go // fakeContext gets a responses queue for tools that run several // commands (like grep_search's two passes). type execResponse struct { stdout string stderr string err error } type fakeContext struct { lastCmd string cmds []string responses []execResponse stdout string stderr string err error fg *fakeForgejoActions } func (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) { f.lastCmd = command f.cmds = append(f.cmds, command) if len(f.responses) > 0 { i := len(f.cmds) - 1 if i >= len(f.responses) { i = len(f.responses) - 1 } r := f.responses[i] return r.stdout, r.stderr, r.err } return f.stdout, f.stderr, f.err } ``` Tests: ```go func TestGrepSearchUsesExtendedRegex(t *testing.T) { fc := &fakeContext{responses: []execResponse{ {stdout: "/project/foo.go:1\n"}, {stdout: "/project/foo.go:1:foo|bar\n"}, }} out, err := grepSearch(fc, grepSearchParams{Pattern: `foo|bar`}) if err != nil { t.Fatal(err) } if !strings.Contains(fc.cmds[0], "grep -I -H -E") { t.Fatalf("expected grep to be invoked with -E (extended regex), got %q", fc.cmds[0]) } if !strings.Contains(out, "foo|bar") { t.Fatalf("unexpected result: %s", out) } } ``` Hmm, wait, the original asserted `grep -Rn -I -H -E`. The new pass-1 command: `grep -I -H -E -i -R -c -e 'foo|bar' '/project'`. So the substring "grep -I -H -E" ✓. And I could also assert that cmds[0] contains "-c" (the counting pass). Let me add that. ```go func TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) { fc := &fakeContext{responses: []execResponse{ {stdout: "/project/internal/store/store.go:1\n"}, {stdout: "/project/internal/store/store.go:1:func (s *Store) Get() {}\n"}, }} out, err := grepSearch(fc, grepSearchParams{ Pattern: `^func $s \*Store$`, Glob: "internal/store/store.go", ContextAfter: 4, }) if err != nil { t.Fatal(err) } if strings.Contains(fc.lastCmd, "--include") { t.Fatalf("literal path must not be passed to --include, got %q", fc.lastCmd) } if !strings.HasSuffix(fc.cmds[0], shellQuote("/project/internal/store/store.go")) { t.Fatalf("expected the counting pass to target the literal path, got %q", fc.cmds[0]) } if !strings.HasSuffix(fc.lastCmd, shellQuote("/project/internal/store/store.go")) { t.Fatalf("expected grep to target the literal path, got %q", fc.lastCmd) } if !strings.Contains(fc.lastCmd, "-A 4") { t.Fatalf("expected context_after to be passed through, got %q", fc.lastCmd) } if !strings.Contains(out, "func (s *Store) Get()") { t.Fatalf("unexpected result: %s", out) } } ``` Wait — the count line: the path grep -c outputs for a literal target `/project/internal/store/store.go` is exactly that path (since we pass it as the file argument). ✓ So responses[0].stdout = `/project/internal/store/store.go:1\n`. ```go func TestGrepSearchGlobStillUsesInclude(t *testing.T) { fc := &fakeContext{responses: []execResponse{ {stdout: "/project/foo.go:1\n"}, {stdout: "/project/foo.go:1:foo\n"}, }} if _, err := grepSearch(fc, grepSearchParams{Pattern: "foo", Glob: "*.go"}); err != nil { t.Fatal(err) } if !strings.Contains(fc.cmds[0], "--include='*.go'") { t.Fatalf("expected glob to be passed to --include, got %q", fc.cmds[0]) } if !strings.HasSuffix(fc.cmds[0], shellQuote("/project")) { t.Fatalf("expected glob search to target /project, got %q", fc.cmds[0]) } } ``` The global-cap test — the heart of the fix: ```go // max_results must cap the total number of matching lines across all // files, not per file: with matches in several files, the search // spends its budget file by file and stops once it is exhausted. func TestGrepSearchMaxResultsIsGlobal(t *testing.T) { fc := &fakeContext{responses: []execResponse{ {stdout: "/project/a.go:3\n/project/b.go:3\n"}, {stdout: "/project/a.go:1:x\n/project/a.go:2:x\n/project/a.go:3:x\n"}, {stdout: "/project/b.go:1:x\n/project/b.go:2:x\n/project/b.go:3:x\n"}, }} out, err := grepSearch(fc, grepSearchParams{Pattern: "x", MaxResults: 4}) if err != nil { t.Fatal(err) } if len(fc.cmds) != 3 { t.Fatalf("expected counting pass plus two extraction passes, got %d commands: %v", len(fc.cmds), fc.cmds) } if !strings.Contains(fc.cmds[1], "-m 3") || !strings.HasSuffix(fc.cmds[1], shellQuote("/project/a.go")) { t.Fatalf("expected first file to take all 3 of its matches, got %q", fc.cmds[1]) } if !strings.Contains(fc.cmds[2], "-m 1") || !strings.HasSuffix(fc.cmds[2], shellQuote("/project/b.go")) { t.Fatalf("expected second file to take only the remaining 1 match, got %q", fc.cmds[2]) } want := "/project/a.go:1:x\n/project/a.go:2:x\n/project/a.go:3:x\n/project/b.go:1:x\n/project/b.go:2:x\n/project/b.go:3:x\n" ... ``` Wait — the output: the second file's grep was invoked with -m 1, so its real output would be only the first match. But the fake returns the full 3-line output regardless (the fake doesn't simulate grep). So the output = response[1] + response[2] concatenated = 6 lines. Hmm, that's a fake artifact. For the assertion, I should either make the fake's second response realistic (only 1 line, as grep -m 1 would return) or just assert on the commands. Let me make the responses realistic: - responses[1] (a.go, -m 3): `/project/a.go:1:x\n/project/a.go:2:x\n/project/a.go:3:x\n` - responses[2] (b.go, -m 1): `/project/b.go:1:x\n` Then out = a's 3 lines + b's 1 line = 4 match lines total. Assert out == that. And assert that b.go's 2nd/3rd lines are not in the output. Also assert that no `head` appears in any command. The default test: ```go // An omitted max_results (zero) falls back to the default budget of // 100 matching lines. func TestGrepSearchDefaultMaxResults(t *testing.T) { fc := &fakeContext{responses: []execResponse{ {stdout: "/project/foo.go:150\n"}, {stdout: "match\n"}, }} if _, err := grepSearch(fc, grepSearchParams{Pattern: "foo"}); err != nil { t.Fatal(err) } if !strings.Contains(fc.lastCmd, "-m 100") { t.Fatalf("expected the default budget of 100 to cap the extraction, got %q", fc.lastCmd) } } ``` The context-separator test: ```go // With context lines, grep separates the output of different files // with a "--" line; the per-file extraction must reproduce that. func TestGrepSearchContextSeparatesFiles(t *testing.T) { fc := &fakeContext{responses: []execResponse{ {stdout: "/project/a.go:1\n/project/b.go:1\n"}, {stdout: "/project/a.go:1:x\n/project/a.go-2-y\n"}, {stdout: "/project/b.go:1:x\n/project/b.go-2-y\n"}, }} out, err := grepSearch(fc, grepSearchParams{Pattern: "x", ContextAfter: 1}) if err != nil { t.Fatal(err) } want := "/project/a.go:1:x\n/project/a.go-2-y\n--\n/project/b.go:1:x\n/project/b.go-2-y\n" if out != want { t.Fatalf("unexpected result: %q", out) } } ``` The no-matches test (unchanged, still valid): ```go func TestGrepSearchNoMatches(t *testing.T) { fc := &fakeContext{err: fmt.Errorf("exit status 1")} out, err := grepSearch(fc, grepSearchParams{Pattern: "nomatch"}) if err != nil { t.Fatal(err) } if out != "No matches found." { t.Fatalf("unexpected result: %q", out) } } ``` Wait — with the new code: pass 1: err=exit 1, stderr="" → not an error → parse the output (empty) → no counts → "No matches found." ✓ Add a test for the -c zero-count variant: ```go // grep -c prints a ":0" line for every non-matching file even when // it exits 1; those must not be mistaken for matches. func TestGrepSearchNoMatchesZeroCounts(t *testing.T) { fc := &fakeContext{ stdout: "/project/a.go:0\n/project/b.go:0\n", err: fmt.Errorf("exit status 1"), } out, err := grepSearch(fc, grepSearchParams{Pattern: "nomatch"}) ... if out != "No matches found." { ... } if len(fc.cmds) != 1 { t.Fatalf("no extraction pass should run when nothing matches, got %d commands", len(fc.cmds)) } } ``` And a test for a bad regex: ```go func TestGrepSearchBadRegexErrors(t *testing.T) { fc := &fakeContext{ stderr: "grep: Unmatched ( or (\n", err: fmt.Errorf("exit status 2"), } if _, err := grepSearch(fc, grepSearchParams{Pattern: "foo("}); err == nil { t.Fatal("expected an error for a bad regex") } } ``` And a unit test for parseCountLine: ```go func TestParseCountLine(t *testing.T) { cases := []struct { line string path string n int ok bool }{ {"/project/foo.go:3", "/project/foo.go", 3, true}, {"/project/foo bar.go:1", "/project/foo bar.go", 1, true}, {"/project/we:ird.go:2", "/project/we:ird.go", 2, true}, {"/project/foo.go:0", "", 0, false}, {"", "", 0, false}, {"/project/foo.go", "", 0, false}, } for _, tc := range cases { fc, ok := parseCountLine(tc.line) if ok != tc.ok || (ok && (fc.path != tc.path || fc.count != tc.n)) { t.Errorf("parseCountLine(%q) = (%q, %d, %v), want (%q, %d, %v)", tc.line, fc.path, fc.count, ok, tc.path, tc.n, tc.ok) } } } ``` Now — the old test `TestGrepSearchLimitsMatchesNotLines` should be replaced by the global test (its intent — "cap matches, not lines" — is subsumed: -m caps matches per file, and the budget caps the total). Actually, let me keep a test that asserts -m is used and no head: fold that assertion into TestGrepSearchMaxResultsIsGlobal (assert cmds[1] contains "-m 3" and no command contains "head"). Now, let me also double-check the `resolvePath` for a literal glob — e.g., "internal/store/store.go" → "/project/internal/store/store.go". ✓ (from shell.go). One more check — the `llm.NewTool`/`AddIntegerProperty` signatures, no changes. Now, let me reconsider: is there any problem with `-R` in pass 1 when the target is a single file? `grep -R -c file` — -R on a single file is fine (treated as a normal file). ✓ Actually, hmm, does -R change anything for a single file? No. But it's harmless. Alternatively, I could omit -R for a literal target… let me keep it uniform. Wait, actually, hmm: `grep -R` on a single regular file — fine. On a file that doesn't exist → exit 2, stderr → error ✓ (same as before). Now, performance consideration: pass 1 reads all files (full scan), pass 2 re-reads the matching files. So the matching files are read twice. For a typical repo, that's negligible. Now, let me reconsider once more: the reviewer might prefer a simpler approach… let me re-read their words: "I think you're right. It's matches PER file - that is not what the agent expects. Can we fix that somehow?" They acknowledge my Note (per-file semantics) and say that's not what the agent expects. "Can we fix that somehow?" — an open invitation to make it global. My two-pass approach does exactly that, exactly. I'm confident in this design. Let me also update the PR description after pushing (I can't edit the PR body directly with the available tools… there's no update_pr tool. The PR body stays as is. My comment will explain the change. That's fine — actually, the PR body's "Note" section will be outdated. I can't edit it with the available tools. I'll clarify in the reply comment.) Now, let me write the code. Actually, wait — one more edge case for pass 1: what if the target is a literal path that's a directory? E.g., glob="internal/tools" (no wildcards) → target=/project/internal/tools → grep -R -c over that directory ✓ works. And a glob with wildcards like "src/?*.go" → --include='src/?*.go'?? Hmm, --include matches against the basename, so "src/?*.go" would never match a basename… that's existing behavior (isGlobPattern → --include), not my concern. OK, let me write the new grep_search.go. One more style point: the current file has a comment about the exit status: "grep exits non-zero (with empty output) when there are no matches; that's a normal result, not a tool failure." — I'll update the comment to reflect the two-pass reality. Also, should the counting pass use `-R`? Yes, for a directory target. For a single-file target, -R is a no-op. Keep it. Let me also think about whether to put `-c` before or after the other flags — irrelevant to grep. Let me write the final code: ```go package tools import ( "context" "fmt" "strconv" "strings" "github.com/abrander/zoo/internal/llm" ) type grepSearchParams struct { Pattern string `json:"query"` Glob string `json:"glob"` CaseSensitive bool `json:"case_sensitive"` ContextBefore int `json:"context_before"` ContextAfter int `json:"context_after"` MaxResults int `json:"max_results"` } func init() { tool := llm.NewTool( "grep_search", "Search for an extended regular expression (ERE, e.g. 'foo|bar', 'func\\(') in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.") tool.AddStringProperty("query", "The regex pattern to search for", true) tool.AddStringProperty("glob", "Optional glob pattern to filter files, e.g. '*.go'. A literal file path without wildcards, e.g. 'internal/store/store.go', is searched directly", false) tool.AddBooleanProperty("case_sensitive", "Whether the search should be case sensitive (default: false)", false) tool.AddIntegerProperty("context_before", "Number of lines of context to show before each match (default: 0)", false) tool.AddIntegerProperty("context_after", "Number of lines of context to show after each match (default: 0)", false) tool.AddIntegerProperty("max_results", "Maximum number of matching lines to return in total, across all files (default: 100)", false) Register(tool, grepSearch) } // grepSearch searches for a pattern and returns at most max_results // matching lines in total. // // grep can only cap matches per file (--max-count), which is not what // max_results promises, so the search runs in two passes: first count // the matching lines in each file, then extract them file by file, // spending a global budget of max_results matches. Files are visited // in the order grep's recursive traversal reported them, so the // results come out in the same order a single grep run would produce. func grepSearch(ctx Context, params grepSearchParams) (string, error) { maxResults := params.MaxResults if maxResults == 0 { maxResults = 100 } // -E makes grep interpret the pattern as an extended regular // expression (ERE), which is the "real" regex flavor the tool // promises: |, +, ?, (), {} all work as metacharacters. Without // it, grep falls back to BRE, where those are treated literally. // -H keeps the filename in the output even when the search target // is a single file, so results look the same as directory // searches. -I skips binary files. base := []string{"grep", "-I", "-H", "-E"} if !params.CaseSensitive { base = append(base, "-i") } // By default the search target is the whole project. grep's // --include matches basenames against a glob, so a literal file // path (no wildcards) passed as the glob would never match; // treat such values as a path and search that file directly. globFilter := params.Glob != "" && isGlobPattern(params.Glob) target := "/project" if params.Glob != "" && !globFilter { target = resolvePath(params.Glob) } // Pass one: count the matching lines in each file. grep -c prints // "path:count" per file (a ":0" line for files without matches), // which is unambiguous even for paths containing colons, since // the count is the final field. countArgs := append(append([]string{}, base...), "-R", "-c") if globFilter { countArgs = append(countArgs, "--include="+shellQuote(params.Glob)) } countArgs = append(countArgs, "-e", shellQuote(params.Pattern), shellQuote(target)) counts, err := grepFileCounts(ctx, countArgs) if err != nil { return "", err } if len(counts) == 0 { return "No matches found.", nil } // Pass two: extract the matches, file by file, until the budget // of max_results matching lines is spent. hasContext := params.ContextBefore > 0 || params.ContextAfter > 0 var ( budget = maxResults out strings.Builder ) for _, fc := range counts { if budget <= 0 { break } n := fc.count if n > budget { n = budget } args := append(append([]string{}, base...), "-n") if params.ContextBefore > 0 { args = append(args, "-B", strconv.Itoa(params.ContextBefore)) } if params.ContextAfter > 0 { args = append(args, "-A", strconv.Itoa(params.ContextAfter)) } args = append(args, "-m", strconv.Itoa(n), "-e", shellQuote(params.Pattern), shellQuote(fc.path)) fileOut, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " ")) if err != nil { // Pass one just counted matches in this file, so it // should still match; an empty result means the file // changed in the meantime and is skipped. Anything else // (e.g. the file vanished) is a real error. if strings.TrimSpace(fileOut) == "" && strings.TrimSpace(stderr) == "" { continue } return "", fmt.Errorf("grep_search: %w", execErr(err, fileOut, stderr)) } if fileOut == "" { continue } if out.Len() > 0 && hasContext { // grep separates the output of different files with a // "--" line when context lines are in play. out.WriteString("--\n") } out.WriteString(fileOut) budget -= n } if out.Len() == 0 { // Every file changed between the passes; nothing to show. return "No matches found.", nil } return out.String(), nil } // fileCount is the number of matching lines in one file, as reported // by the counting pass. type fileCount struct { path string count int } // grepFileCounts runs the counting pass and returns the files with at // least one match, in traversal order. func grepFileCounts(ctx Context, args []string) ([]fileCount, error) { output, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " ")) if err != nil && strings.TrimSpace(stderr) != "" { // A diagnostic on stderr means grep itself failed (e.g. a // bad regex); exit 1 with clean stderr just means nothing // matched, and the ":0" counts below say the same. return nil, fmt.Errorf("grep_search: %w", execErr(err, output, stderr)) } var counts []fileCount for _, line := range strings.Split(output, "\n") { if fc, ok := parseCountLine(line); ok { counts = append(counts, fc) } } return counts, nil } // parseCountLine parses one "path:count" line from grep -c output. // The count is the last colon-separated field, so paths containing // colons still parse; lines without a positive numeric count // (including the ":0" lines grep -c prints for non-matching files) // are rejected. func parseCountLine(line string) (fileCount, bool) { i := strings.LastIndex(line, ":") if i < 0 { return fileCount{}, false } n, err := strconv.Atoi(line[i+1:]) if err != nil || n <= 0 { return fileCount{}, false } return fileCount{path: line[:i], count: n}, true } // isGlobPattern reports whether s contains the glob metacharacters // fnmatch (and thus grep's --include) understands. A value without // them is a literal path, which --include would never match since it // globs basenames, not full paths. func isGlobPattern(s string) bool { return strings.ContainsAny(s, "*?[") } ``` Wait, there's a problem with pass 2 for a literal-path target: the count line's path = the target as passed (e.g., `/project/internal/store/store.go`). Pass 2 greps that exact path. ✓ But wait — one more subtlety about the count line's path for a directory target: grep -R with target `/project` outputs paths like `/project/foo.go` (the target prefix as given). ✓ Since we pass an absolute path, it's absolute. Now, `append(append([]string{}, base...), "-R", "-c")` — a fresh copy ✓. Hmm, one thing: in pass 1, when the target is a single file, `-R` is unnecessary but harmless. OK. Let me re-verify the aliasing of `base`: `base` is built once. countArgs = a fresh copy + additions. Each pass-2 args = a fresh copy + additions. `base` itself is never modified. ✓ Now, the tests. I also need to update the fakeContext. Let me look at the rest of tools_test.go (lines 280-367) to see if there are other tests using fakeContext that I might break.

Now I have the full picture. Let me check the rest of the test file and the issue #68 context:

Tool 🔧 read_file {"end_line":367,"path":"/project/internal/tools/tools_test.go","start_line":280}

Arguments

{"end_line":367,"path":"/project/internal/tools/tools_test.go","start_line":280}

Result

{"path":"/project/internal/tools/tools_test.go","content":"\n\t_, err := bash(fc, bashParams{Command: \"ls /nope\"})\n\tif err == nil {\n\t\tt.Fatal(\"expected an error for a non-zero exit\")\n\t}\n\tif !strings.Contains(err.Error(), \"exited with status 2\") || !strings.Contains(err.Error(), \"cannot access\") {\n\t\tt.Fatalf(\"expected the exit code and the command's stderr in the error, got: %v\", err)\n\t}\n}\n\nfunc TestBashSilentFailure(t *testing.T) {\n\tfc := \u0026fakeContext{err: fmt.Errorf(\"command exited with status 1\")}\n\n\t_, err := bash(fc, bashParams{Command: \"false\"})\n\tif err == nil {\n\t\tt.Fatal(\"expected an error for a non-zero exit\")\n\t}\n\tif !strings.Contains(err.Error(), \"exited with status 1\") {\n\t\tt.Fatalf(\"unexpected error: %v\", err)\n\t}\n}\n\nfunc TestCombineOutput(t *testing.T) {\n\tcases := []struct {\n\t\tstdout, stderr, want string\n\t}{\n\t\t{\"a\\n\", \"\", \"a\\n\"},\n\t\t{\"\", \"b\\n\", \"b\\n\"},\n\t\t{\"\", \"\", \"\"},\n\t\t{\"a\\n\", \"b\\n\", \"a\\nb\\n\"},\n\t\t{\"a\", \"b\\n\", \"a\\nb\\n\"},\n\t}\n\n\tfor _, c := range cases {\n\t\tif got := combineOutput(c.stdout, c.stderr); got != c.want {\n\t\t\tt.Errorf(\"combineOutput(%q, %q) = %q, want %q\", c.stdout, c.stderr, got, c.want)\n\t\t}\n\t}\n}\n\nfunc TestRegistryRoundTrip(t *testing.T) {\n\tif len(All()) == 0 {\n\t\tt.Fatal(\"expected registered tools\")\n\t}\n\n\tfound := false\n\tfor _, tl := range All() {\n\t\tif tl.Function.Name == \"bash\" {\n\t\t\tfound = true\n\t\t}\n\t}\n\tif !found {\n\t\tt.Fatal(\"expected bash tool to be registered\")\n\t}\n}\n\n// TestToolSchemas guards the wire format of every registered tool: an\n// empty or missing parameters type is rejected by strict servers with\n// \"” is not valid under any of the given schemas\".\nfunc TestToolSchemas(t *testing.T) {\n\tfor _, tool := range All() {\n\t\traw, err := json.Marshal(tool)\n\t\tif err != nil {\n\t\t\tt.Fatalf(\"%s: %v\", tool.Function.Name, err)\n\t\t}\n\n\t\tvar decoded struct {\n\t\t\tFunction struct {\n\t\t\t\tParameters struct {\n\t\t\t\t\tType       string                     `json:\"type\"`\n\t\t\t\t\tProperties map[string]json.RawMessage `json:\"properties\"`\n\t\t\t\t} `json:\"parameters\"`\n\t\t\t} `json:\"function\"`\n\t\t}\n\n\t\tif err := json.Unmarshal(raw, \u0026decoded); err != nil {\n\t\t\tt.Fatalf(\"%s: %v\", tool.Function.Name, err)\n\t\t}\n\n\t\tif decoded.Function.Parameters.Type != \"object\" {\n\t\t\tt.Errorf(\"%s: parameters.type = %q, want \\\"object\\\"\", tool.Function.Name, decoded.Function.Parameters.Type)\n\t\t}\n\n\t\tif decoded.Function.Parameters.Properties == nil {\n\t\t\tt.Errorf(\"%s: parameters.properties missing\", tool.Function.Name)\n\t\t}\n\t}\n}","start_line":280,"end_line":367,"total_lines":367,"truncated":false}

Tool 🔧 bash {"command":"cd /project && git log --all --oneline | head -20 && git fetch origin 2>/dev/null; git log origin/main --oneline -3 2>/dev/null | head"}

Arguments

{"command":"cd /project && git log --all --oneline | head -20 && git fetch origin 2>/dev/null; git log origin/main --oneline -3 2>/dev/null | head"}

Result

41444dd grep_search: cap matches with --max-count instead of head -n
f443489 Merge pull request 'grep_search: treat a wildcard-free glob as a literal file path' (#66) from issue-65-greg into main
474ef42 grep_search: treat a wildcard-free glob as a literal file path
081d4bd Merge pull request 'livelog: open reasoning/content blocks lazily, on first real text' (#63) from issue-62-greg into main
49f034a livelog: open reasoning/content blocks lazily, on first real text
f9b1877 Add some retry logic for the LLM backend.
7423d86 Try to re-roll broken tool calls.
f58963a Merge pull request 'Jobs page: follow the live log tail, with a jump-to-bottom button' (#58) from issue-57-greg into main
0b5138d Merge pull request 'tools: drop the PTY from docker exec, keep stdout/stderr separate' (#54) from issue-52-greg into main
c91b25a More correct tool schema.
f4da8cd Jobs page: follow the live log tail, with a jump-to-bottom button
98298f6 Merge pull request 'Fix excessive vertical space in job view blocks (#53)' (#55) from issue-53-greg into main
b75b64d Fix excessive vertical space in job view blocks
4ff7ec5 tools: drop the PTY from docker exec, keep stdout/stderr separate
10c3dce Better Docker/git inter.
315f993 Add docker image build.
5717258 Merge pull request 'forgejo: repository allowlist with wildcard patterns' (#40) from issue-39-greg into main
823ae62 fix(forgejo): resolve test helper collision after merging main
bccf930 Merge branch 'main' into issue-39-greg
1365ea8 Merge pull request 'Pass the agent's git credential to the sandbox, clone inside it' (#49) from issue-48-greg into main
49416c8 Merge pull request 'Live dashboard at /: jobs-changed SSE stream' (#67) from issue-64-greg into main
bf26c51 web: make the dashboard at / live via a jobs-changed SSE stream
f443489 Merge pull request 'grep_search: treat a wildcard-free glob as a literal file path' (#66) from issue-65-greg into main

Thinking

Now I have a grasp of the overall picture. Let's implement the fix. **Design (summary):** `max_results` must be a **global** upper bound on the number of matched lines. Since grep can only limit on a per-file basis (`--max-count`), the search will be executed in two passes: 1. **Counting pass:** `grep -R -c` → per-file `path:count` (unambiguous: the count is the last field). 2. **Extraction pass:** For each file (in traversal order), run `grep -m min(count, remaining budget)` with context flags, and stop once the budget is exhausted. Concatenate the per-file outputs, and when context is enabled, join them with `--` (exactly reproducing the format of a single grep). This gives us an exact global upper bound, with no fragile parsing of the output content. Now let's write the new `grep_search.go`.

I've grasped the overall picture. The reviewer is correct: `--max-count` is per-file, but the agent expects `max_results` to be a **global** upper limit on the number of matched lines. **My plan:** Since grep cannot limit on a global basis, I'll make the search a two-pass approach: 1. **Counting pass** — `grep -R -c` returns `path:count` per file (unambiguous: the count is the last field, so it can be parsed even if the path contains a colon). 2. **Extraction pass** — For each file (in traversal order), run `grep -m min(count, remaining budget)` with context flags, and stop once the global budget is exhausted. The per-file outputs are concatenated in exactly the same format that a single grep would produce (including `--` separators between files when context is enabled). This gives us an *exact* global upper limit without any fragile parsing of the output content. I've already verified grep's behavior in the container (that `-c` lists files with zero counts, that `-H` preserves the filename for a single file, and the separator format). Now, on to the implementation:

Tool 🔧 write_file {"content":"package tools\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\t\"strconv\"\n\t\"strings\"\n\n\t\"github.com/abrander/zoo/internal/llm\"\n)\n\ntype grepSearchParams struct {\n\tPattern string `json:\"query\"`\n\tGlob string `json:\"glob\"`\n\tCaseSensitive bool `json:\"case_sensitive\"`\n\tContextBefore int `json:\"context_before\"`\n\tContextAfter int `json:\"context_after\"`\n\tMaxResults int `json:\"max_results\"`\n}\n\nfunc init() {\n\ttool := llm.NewTool(\n\t\t\"grep_search\",\n\t\t\"Search for an extended regular expression (ERE, e.g. 'foo|bar', 'func\\\\(') in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.\")\n\n\ttool.AddStringProperty(\"query\", \"The regex pattern to search for\", true)\n\ttool.AddStringProperty(\"glob\", \"Optional glob pattern to filter files, e.g. '*.go'. A literal file path without wildcards, e.g. 'internal/store/store.go', is searched directly\", false)\n\ttool.AddBooleanProperty(\"case_sensitive\", \"Whether the search should be case sensitive (default: false)\", false)\n\ttool.AddIntegerProperty(\"context_before\", \"Number of lines of context to show before each match (default: 0)\", false)\n\ttool.AddIntegerProperty(\"context_after\", \"Number of lines of context to show after each match (default: 0)\", false)\n\ttool.AddIntegerProperty(\"max_results\", \"Maximum number of matching lines to return in total, across all files (default: 100)\", false)\n\n\tRegister(tool, grepSearch)\n}\n\n// grepSearch searches for a pattern and returns at most max_results\n// matching lines in total.\n//\n// grep can only cap matches per file (--max-count), which is not what\n// max_results promises, so the search runs in two passes: first count\n// the matching lines in each file, then extract them file by file,\n// spending a global budget of max_results matches. Files are visited\n// in the order grep's recursive traversal reported them, so the\n// results come out in the same order a single grep run would produce.\nfunc grepSearch(ctx Context, params grepSearchParams) (string, error) {\n\tmaxResults := params.MaxResults\n\tif maxResults == 0 {\n\t\tmaxResults = 100\n\t}\n\n\t// -E makes grep interpret the pattern as an extended regular\n\t// expression (ERE), which is the \"real\" regex flavor the tool\n\t// promises: |, +, ?, (), {} all work as metacharacters. Without\n\t// it, grep falls back to BRE, where those are treated literally.\n\t// -H keeps the filename in the output even when the search target\n\t// is a single file, so results look the same as directory\n\t// searches. -I skips binary files.\n\tbase := []string{\"grep\", \"-I\", \"-H\", \"-E\"}\n\tif !params.CaseSensitive {\n\t\tbase = append(base, \"-i\")\n\t}\n\n\t// By default the search target is the whole project. grep's\n\t// --include matches basenames against a glob, so a literal file\n\t// path (no wildcards) passed as the glob would never match;\n\t// treat such values as a path and search that file directly.\n\tglobFilter := params.Glob != \"\" && isGlobPattern(params.Glob)\n\ttarget := \"/project\"\n\tif params.Glob != \"\" && !globFilter {\n\t\ttarget = resolvePath(params.Glob)\n\t}\n\n\t// Pass one: count the matching lines in each file. grep -c prints\n\t// \"path:count\" per file (a \":0\" line for files without matches),\n\t// which is unambiguous to parse: the count is the final field, so\n\t// even paths containing colons come out right.\n\tcountArgs := append(append([]string{}, base...), \"-R\", \"-c\")\n\tif globFilter {\n\t\tcountArgs = append(countArgs, \"--include=\"+shellQuote(params.Glob))\n\t}\n\tcountArgs = append(countArgs, \"-e\", shellQuote(params.Pattern), shellQuote(target))\n\n\tcounts, err := grepFileCounts(ctx, countArgs)\n\tif err != nil {\n\t\treturn \"\", err\n\t}\n\tif len(counts) == 0 {\n\t\treturn \"No matches found.\", nil\n\t}\n\n\t// Pass two: extract the matches, file by file, until the budget\n\t// of max_results matching lines is spent.\n\thasContext := params.ContextBefore > 0 || params.ContextAfter > 0\n\tvar (\n\t\tbudget = maxResults\n\t\tout strings.Builder\n\t)\n\tfor _, fc := range counts {\n\t\tif budget <= 0 {\n\t\t\tbreak\n\t\t}\n\n\t\tn := fc.count\n\t\tif n > budget {\n\t\t\tn = budget\n\t\t}\n\n\t\targs := append(append([]string{}, base...), \"-n\")\n\t\tif params.ContextBefore > 0 {\n\t\t\targs = append(args, \"-B\", strconv.Itoa(params.ContextBefore))\n\t\t}\n\t\tif params.ContextAfter > 0 {\n\t\t\targs = append(args, \"-A\", strconv.Itoa(params.ContextAfter))\n\t\t}\n\t\targs = append(args, \"-m\", strconv.Itoa(n), \"-e\", shellQuote(params.Pattern), shellQuote(fc.path))\n\n\t\tfileOut, stderr, err := ctx.Exec(context.Background(), strings.Join(args, \" \"))\n\t\tif err != nil {\n\t\t\t// Pass one just counted matches in this file, so it\n\t\t\t// should still match; an empty result with no diagnostic\n\t\t\t// means the file changed in the meantime and is skipped.\n\t\t\t// Anything else (e.g. the file vanished) is a real error.\n\t\t\tif strings.TrimSpace(fileOut) == \"\" && strings.TrimSpace(stderr) == \"\" {\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\treturn \"\", fmt.Errorf(\"grep_search: %w\", execErr(err, fileOut, stderr))\n\t\t}\n\n\t\tif fileOut == \"\" {\n\t\t\tcontinue\n\t\t}\n\t\tif out.Len() > 0 && hasContext {\n\t\t\t// grep separates the output of different files with a\n\t\t\t// \"--\" line when context lines are in play.\n\t\t\tout.WriteString(\"--\\n\")\n\t\t}\n\t\tout.WriteString(fileOut)\n\t\tbudget -= n\n\t}\n\n\tif out.Len() == 0 {\n\t\t// Every file changed between the passes; nothing to show.\n\t\treturn \"No matches found.\", nil\n\t}\n\n\treturn out.String(), nil\n}\n\n// fileCount is the number of matching lines in one file, as reported\n// by the counting pass.\ntype fileCount struct {\n\tpath string\n\tcount int\n}\n\n// grepFileCounts runs the counting pass and returns the files with at\n// least one match, in traversal order.\nfunc grepFileCounts(ctx Context, args []string) ([]fileCount, error) {\n\toutput, stderr, err := ctx.Exec(context.Background(), strings.Join(args, \" \"))\n\tif err != nil && strings.TrimSpace(stderr) != \"\" {\n\t\t// A diagnostic on stderr means grep itself failed (e.g. a\n\t\t// bad regex). Exit 1 with clean stderr just means nothing\n\t\t// matched; the \":0\" counts below say the same.\n\t\treturn nil, fmt.Errorf(\"grep_search: %w\", execErr(err, output, stderr))\n\t}\n\n\tvar counts []fileCount\n\tfor _, line := range strings.Split(output, \"\\n\") {\n\t\tif fc, ok := parseCountLine(line); ok {\n\t\t\tcounts = append(counts, fc)\n\t\t}\n\t}\n\treturn counts, nil\n}\n\n// parseCountLine parses one \"path:count\" line from grep -c output.\n// The count is the last colon-separated field, so paths containing\n// colons still parse; lines without a positive numeric count\n// (including the \":0\" lines grep -c prints for non-matching files)\n// are rejected.\nfunc parseCountLine(line string) (fileCount, bool) {\n\ti := strings.LastIndex(line, \":\")\n\tif i < 0 {\n\t\treturn fileCount{}, false\n\t}\n\tn, err := strconv.Atoi(line[i+1:])\n\tif err != nil || n <= 0 {\n\t\treturn fileCount{}, false\n\t}\n\treturn fileCount{path: line[:i], count: n}, true\n}\n\n// isGlobPattern reports whether s contains the glob metacharacters\n// fnmatch (and thus grep's --include) understands. A value without\n// them is a literal path, which --include would never match since it\n// globs basenames, not full paths.\nfunc isGlobPattern(s string) bool {\n\treturn strings.ContainsAny(s, \"*?[\")\n}\n","path":"/project/internal/tools/grep_search.go"}

Arguments

{"content":"package tools\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\t\"strconv\"\n\t\"strings\"\n\n\t\"github.com/abrander/zoo/internal/llm\"\n)\n\ntype grepSearchParams struct {\n\tPattern       string `json:\"query\"`\n\tGlob          string `json:\"glob\"`\n\tCaseSensitive bool   `json:\"case_sensitive\"`\n\tContextBefore int    `json:\"context_before\"`\n\tContextAfter  int    `json:\"context_after\"`\n\tMaxResults    int    `json:\"max_results\"`\n}\n\nfunc init() {\n\ttool := llm.NewTool(\n\t\t\"grep_search\",\n\t\t\"Search for an extended regular expression (ERE, e.g. 'foo|bar', 'func\\\\(') in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.\")\n\n\ttool.AddStringProperty(\"query\", \"The regex pattern to search for\", true)\n\ttool.AddStringProperty(\"glob\", \"Optional glob pattern to filter files, e.g. '*.go'. A literal file path without wildcards, e.g. 'internal/store/store.go', is searched directly\", false)\n\ttool.AddBooleanProperty(\"case_sensitive\", \"Whether the search should be case sensitive (default: false)\", false)\n\ttool.AddIntegerProperty(\"context_before\", \"Number of lines of context to show before each match (default: 0)\", false)\n\ttool.AddIntegerProperty(\"context_after\", \"Number of lines of context to show after each match (default: 0)\", false)\n\ttool.AddIntegerProperty(\"max_results\", \"Maximum number of matching lines to return in total, across all files (default: 100)\", false)\n\n\tRegister(tool, grepSearch)\n}\n\n// grepSearch searches for a pattern and returns at most max_results\n// matching lines in total.\n//\n// grep can only cap matches per file (--max-count), which is not what\n// max_results promises, so the search runs in two passes: first count\n// the matching lines in each file, then extract them file by file,\n// spending a global budget of max_results matches. Files are visited\n// in the order grep's recursive traversal reported them, so the\n// results come out in the same order a single grep run would produce.\nfunc grepSearch(ctx Context, params grepSearchParams) (string, error) {\n\tmaxResults := params.MaxResults\n\tif maxResults == 0 {\n\t\tmaxResults = 100\n\t}\n\n\t// -E makes grep interpret the pattern as an extended regular\n\t// expression (ERE), which is the \"real\" regex flavor the tool\n\t// promises: |, +, ?, (), {} all work as metacharacters. Without\n\t// it, grep falls back to BRE, where those are treated literally.\n\t// -H keeps the filename in the output even when the search target\n\t// is a single file, so results look the same as directory\n\t// searches. -I skips binary files.\n\tbase := []string{\"grep\", \"-I\", \"-H\", \"-E\"}\n\tif !params.CaseSensitive {\n\t\tbase = append(base, \"-i\")\n\t}\n\n\t// By default the search target is the whole project. grep's\n\t// --include matches basenames against a glob, so a literal file\n\t// path (no wildcards) passed as the glob would never match;\n\t// treat such values as a path and search that file directly.\n\tglobFilter := params.Glob != \"\" && isGlobPattern(params.Glob)\n\ttarget := \"/project\"\n\tif params.Glob != \"\" && !globFilter {\n\t\ttarget = resolvePath(params.Glob)\n\t}\n\n\t// Pass one: count the matching lines in each file. grep -c prints\n\t// \"path:count\" per file (a \":0\" line for files without matches),\n\t// which is unambiguous to parse: the count is the final field, so\n\t// even paths containing colons come out right.\n\tcountArgs := append(append([]string{}, base...), \"-R\", \"-c\")\n\tif globFilter {\n\t\tcountArgs = append(countArgs, \"--include=\"+shellQuote(params.Glob))\n\t}\n\tcountArgs = append(countArgs, \"-e\", shellQuote(params.Pattern), shellQuote(target))\n\n\tcounts, err := grepFileCounts(ctx, countArgs)\n\tif err != nil {\n\t\treturn \"\", err\n\t}\n\tif len(counts) == 0 {\n\t\treturn \"No matches found.\", nil\n\t}\n\n\t// Pass two: extract the matches, file by file, until the budget\n\t// of max_results matching lines is spent.\n\thasContext := params.ContextBefore > 0 || params.ContextAfter > 0\n\tvar (\n\t\tbudget = maxResults\n\t\tout    strings.Builder\n\t)\n\tfor _, fc := range counts {\n\t\tif budget <= 0 {\n\t\t\tbreak\n\t\t}\n\n\t\tn := fc.count\n\t\tif n > budget {\n\t\t\tn = budget\n\t\t}\n\n\t\targs := append(append([]string{}, base...), \"-n\")\n\t\tif params.ContextBefore > 0 {\n\t\t\targs = append(args, \"-B\", strconv.Itoa(params.ContextBefore))\n\t\t}\n\t\tif params.ContextAfter > 0 {\n\t\t\targs = append(args, \"-A\", strconv.Itoa(params.ContextAfter))\n\t\t}\n\t\targs = append(args, \"-m\", strconv.Itoa(n), \"-e\", shellQuote(params.Pattern), shellQuote(fc.path))\n\n\t\tfileOut, stderr, err := ctx.Exec(context.Background(), strings.Join(args, \" \"))\n\t\tif err != nil {\n\t\t\t// Pass one just counted matches in this file, so it\n\t\t\t// should still match; an empty result with no diagnostic\n\t\t\t// means the file changed in the meantime and is skipped.\n\t\t\t// Anything else (e.g. the file vanished) is a real error.\n\t\t\tif strings.TrimSpace(fileOut) == \"\" && strings.TrimSpace(stderr) == \"\" {\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\treturn \"\", fmt.Errorf(\"grep_search: %w\", execErr(err, fileOut, stderr))\n\t\t}\n\n\t\tif fileOut == \"\" {\n\t\t\tcontinue\n\t\t}\n\t\tif out.Len() > 0 && hasContext {\n\t\t\t// grep separates the output of different files with a\n\t\t\t// \"--\" line when context lines are in play.\n\t\t\tout.WriteString(\"--\\n\")\n\t\t}\n\t\tout.WriteString(fileOut)\n\t\tbudget -= n\n\t}\n\n\tif out.Len() == 0 {\n\t\t// Every file changed between the passes; nothing to show.\n\t\treturn \"No matches found.\", nil\n\t}\n\n\treturn out.String(), nil\n}\n\n// fileCount is the number of matching lines in one file, as reported\n// by the counting pass.\ntype fileCount struct {\n\tpath  string\n\tcount int\n}\n\n// grepFileCounts runs the counting pass and returns the files with at\n// least one match, in traversal order.\nfunc grepFileCounts(ctx Context, args []string) ([]fileCount, error) {\n\toutput, stderr, err := ctx.Exec(context.Background(), strings.Join(args, \" \"))\n\tif err != nil && strings.TrimSpace(stderr) != \"\" {\n\t\t// A diagnostic on stderr means grep itself failed (e.g. a\n\t\t// bad regex). Exit 1 with clean stderr just means nothing\n\t\t// matched; the \":0\" counts below say the same.\n\t\treturn nil, fmt.Errorf(\"grep_search: %w\", execErr(err, output, stderr))\n\t}\n\n\tvar counts []fileCount\n\tfor _, line := range strings.Split(output, \"\\n\") {\n\t\tif fc, ok := parseCountLine(line); ok {\n\t\t\tcounts = append(counts, fc)\n\t\t}\n\t}\n\treturn counts, nil\n}\n\n// parseCountLine parses one \"path:count\" line from grep -c output.\n// The count is the last colon-separated field, so paths containing\n// colons still parse; lines without a positive numeric count\n// (including the \":0\" lines grep -c prints for non-matching files)\n// are rejected.\nfunc parseCountLine(line string) (fileCount, bool) {\n\ti := strings.LastIndex(line, \":\")\n\tif i < 0 {\n\t\treturn fileCount{}, false\n\t}\n\tn, err := strconv.Atoi(line[i+1:])\n\tif err != nil || n <= 0 {\n\t\treturn fileCount{}, false\n\t}\n\treturn fileCount{path: line[:i], count: n}, true\n}\n\n// isGlobPattern reports whether s contains the glob metacharacters\n// fnmatch (and thus grep's --include) understands. A value without\n// them is a literal path, which --include would never match since it\n// globs basenames, not full paths.\nfunc isGlobPattern(s string) bool {\n\treturn strings.ContainsAny(s, \"*?[\")\n}\n","path":"/project/internal/tools/grep_search.go"}

Result

OK

Thinking

Next, I'll update the tests. First, I'll extend `fakeContext` so it can queue up multiple Exec responses, and after that, I'll rewrite the grep tests.

Now update the test harness to support multiple `Exec` calls (one per pass), and rewrite the grep tests:

Tool 🔧 edit_file {"find":"type fakeContext struct {\n\tlastCmd string\n\tstdout string\n\tstderr string\n\n\terr error\n\tfg *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\treturn f.stdout, f.stderr, f.err\n}","path":"/project/internal/tools/tools_test.go","replace":"// execResponse is one canned answer to an Exec call.\ntype execResponse struct {\n\tstdout string\n\tstderr string\n\terr error\n}\n\ntype fakeContext struct {\n\tlastCmd string\n\tcmds []string\n\t// responses, when set, are returned one per Exec call in order\n\t// (the last one repeats once exhausted); otherwise the single\n\t// stdout/stderr/err fields answer every call.\n\tresponses []execResponse\n\tstdout string\n\tstderr string\n\n\terr error\n\tfg *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\tf.cmds = append(f.cmds, command)\n\tif len(f.responses) > 0 {\n\t\ti := len(f.cmds) - 1\n\t\tif i >= len(f.responses) {\n\t\t\ti = len(f.responses) - 1\n\t\t}\n\t\tr := f.responses[i]\n\t\treturn r.stdout, r.stderr, r.err\n\t}\n\treturn f.stdout, f.stderr, f.err\n}"}

Arguments

{"find":"type fakeContext struct {\n\tlastCmd string\n\tstdout  string\n\tstderr  string\n\n\terr     error\n\tfg      *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\treturn f.stdout, f.stderr, f.err\n}","path":"/project/internal/tools/tools_test.go","replace":"// execResponse is one canned answer to an Exec call.\ntype execResponse struct {\n\tstdout string\n\tstderr string\n\terr    error\n}\n\ntype fakeContext struct {\n\tlastCmd string\n\tcmds    []string\n\t// responses, when set, are returned one per Exec call in order\n\t// (the last one repeats once exhausted); otherwise the single\n\t// stdout/stderr/err fields answer every call.\n\tresponses []execResponse\n\tstdout    string\n\tstderr    string\n\n\terr error\n\tfg  *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\tf.cmds = append(f.cmds, command)\n\tif len(f.responses) > 0 {\n\t\ti := len(f.cmds) - 1\n\t\tif i >= len(f.responses) {\n\t\t\ti = len(f.responses) - 1\n\t\t}\n\t\tr := f.responses[i]\n\t\treturn r.stdout, r.stderr, r.err\n\t}\n\treturn f.stdout, f.stderr, f.err\n}"}

Result

ERROR CALLING TOOL: "type fakeContext struct {\n\tlastCmd string\n\tstdout  string\n\tstderr  string\n\n\terr     error\n\tfg      *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\treturn f.stdout, f.stderr, f.err\n}" not found in "/project/internal/tools/tools_test.go"

Thinking

The exact text didn't match — probably a whitespace difference. Let me try reading the exact lines 35-55.

Tool 🔧 read_file {"end_line":56,"path":"/project/internal/tools/tools_test.go","start_line":34}

Arguments

{"end_line":56,"path":"/project/internal/tools/tools_test.go","start_line":34}

Result

{"path":"/project/internal/tools/tools_test.go","content":"}\n\ntype fakeContext struct {\n\tlastCmd string\n\tstdout  string\n\tstderr  string\n\terr     error\n\tfg      *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\treturn f.stdout, f.stderr, f.err\n}\n\nfunc (f *fakeContext) Forgejo() ForgejoActions {\n\treturn f.fg\n}\n\nfunc TestShellQuote(t *testing.T) {\n\tcases := map[string]string{\n\t\t\"simple\":     \"'simple'\",\n\t\t\"it's a dir\": `'it'\\''s a dir'`,","start_line":34,"end_line":56,"total_lines":367,"truncated":true}

Thinking

In the file, `err error` is on the line immediately after `stderr string` (there's no blank line in between). I'll redo the edit with the exact text.

Tool 🔧 edit_file {"find":"type fakeContext struct {\n\tlastCmd string\n\tstdout string\n\tstderr string\n\terr error\n\tfg *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\treturn f.stdout, f.stderr, f.err\n}","path":"/project/internal/tools/tools_test.go","replace":"// execResponse is one canned answer to an Exec call.\ntype execResponse struct {\n\tstdout string\n\tstderr string\n\terr error\n}\n\ntype fakeContext struct {\n\tlastCmd string\n\tcmds []string\n\t// responses, when set, are returned one per Exec call in order\n\t// (the last one repeats once exhausted); otherwise the single\n\t// stdout/stderr/err fields answer every call.\n\tresponses []execResponse\n\tstdout string\n\tstderr string\n\terr error\n\tfg *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\tf.cmds = append(f.cmds, command)\n\tif len(f.responses) > 0 {\n\t\ti := len(f.cmds) - 1\n\t\tif i >= len(f.responses) {\n\t\t\ti = len(f.responses) - 1\n\t\t}\n\t\tr := f.responses[i]\n\t\treturn r.stdout, r.stderr, r.err\n\t}\n\treturn f.stdout, f.stderr, f.err\n}"}

Arguments

{"find":"type fakeContext struct {\n\tlastCmd string\n\tstdout  string\n\tstderr  string\n\terr     error\n\tfg      *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\treturn f.stdout, f.stderr, f.err\n}","path":"/project/internal/tools/tools_test.go","replace":"// execResponse is one canned answer to an Exec call.\ntype execResponse struct {\n\tstdout string\n\tstderr string\n\terr    error\n}\n\ntype fakeContext struct {\n\tlastCmd string\n\tcmds    []string\n\t// responses, when set, are returned one per Exec call in order\n\t// (the last one repeats once exhausted); otherwise the single\n\t// stdout/stderr/err fields answer every call.\n\tresponses []execResponse\n\tstdout    string\n\tstderr    string\n\terr       error\n\tfg        *fakeForgejoActions\n}\n\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tf.lastCmd = command\n\tf.cmds = append(f.cmds, command)\n\tif len(f.responses) > 0 {\n\t\ti := len(f.cmds) - 1\n\t\tif i >= len(f.responses) {\n\t\t\ti = len(f.responses) - 1\n\t\t}\n\t\tr := f.responses[i]\n\t\treturn r.stdout, r.stderr, r.err\n\t}\n\treturn f.stdout, f.stderr, f.err\n}"}

Result

1 occurrences replaced

Thinking

Next, I'll rewrite the grep tests. I'll replace the test block from `TestGrepSearchUsesExtendedRegex` through `TestGrepSearchDefaultMaxResults` (the ones that assert the old command format) with new tests.

Now replace the grep tests with ones matching the two-pass design:

Tool 🔧 edit_file {"find":"func TestGrepSearchUsesExtendedRegex(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo|bar\\n\"}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: `foo|bar`})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"grep -Rn -I -H -E\") {\n\t\tt.Fatalf(\"expected grep to be invoked with -E (extended regex), got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"foo|bar\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A literal file path in the glob parameter (no wildcards) must be\n// searched directly, not passed to --include, which globs basenames\n// and would never match a full path.\nfunc TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/internal/store/store.go:1:func (s *Store) Get() {}\\n\"}\n\n\tout, err := grepSearch(fc, grepSearchParams{\n\t\tPattern: `^func \$s \\*Store\$`,\n\t\tGlob: \"internal/store/store.go\",\n\t\tContextAfter: 4,\n\t})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif strings.Contains(fc.lastCmd, \"--include\") {\n\t\tt.Fatalf(\"literal path must not be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project/internal/store/store.go\")) {\n\t\tt.Fatalf(\"expected grep to target the literal path, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"-A 4\") {\n\t\tt.Fatalf(\"expected context_after to be passed through, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"func (s *Store) Get()\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A glob with wildcards must still be passed to --include and the\n// search must target the whole project.\nfunc TestGrepSearchGlobStillUsesInclude(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: \"*.go\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--include='*.go'\") {\n\t\tt.Fatalf(\"expected glob to be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project\")) {\n\t\tt.Fatalf(\"expected glob search to target /project, got %q\", fc.lastCmd)\n\t}\n}\n\n// max_results must cap the number of matching lines via grep's\n// --max-count, not the number of raw output lines via a head pipe:\n// with context lines, a single match spans several lines, so head\n// would silently drop matches.\nfunc TestGrepSearchLimitsMatchesNotLines(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", MaxResults: 5, ContextAfter: 2}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--max-count=5\") {\n\t\tt.Fatalf(\"expected max_results to be passed to grep as --max-count, got %q\", fc.lastCmd)\n\t}\n\tif strings.Contains(fc.lastCmd, \"head\") {\n\t\tt.Fatalf(\"expected no head pipe in the command, got %q\", fc.lastCmd)\n\t}\n}\n\n// An omitted max_results (zero) falls back to the default of 100.\nfunc TestGrepSearchDefaultMaxResults(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--max-count=100\") {\n\t\tt.Fatalf(\"expected the default --max-count=100, got %q\", fc.lastCmd)\n\t}\n}","path":"/project/internal/tools/tools_test.go","replace":"func TestGrepSearchUsesExtendedRegex(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/foo.go:1\\n\"},\n\t\t{stdout: \"/project/foo.go:1:foo|bar\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: `foo|bar`})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif !strings.Contains(fc.cmds[0], \"grep -I -H -E\") {\n\t\tt.Fatalf(\"expected grep to be invoked with -E (extended regex), got %q\", fc.cmds[0])\n\t}\n\tif !strings.Contains(fc.cmds[0], \"-c\") {\n\t\tt.Fatalf(\"expected the counting pass to use grep -c, got %q\", fc.cmds[0])\n\t}\n\tif !strings.Contains(out, \"foo|bar\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A literal file path in the glob parameter (no wildcards) must be\n// searched directly, not passed to --include, which globs basenames\n// and would never match a full path.\nfunc TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/internal/store/store.go:1\\n\"},\n\t\t{stdout: \"/project/internal/store/store.go:1:func (s *Store) Get() {}\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{\n\t\tPattern: `^func \$s \\*Store\$`,\n\t\tGlob: \"internal/store/store.go\",\n\t\tContextAfter: 4,\n\t})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif strings.Contains(fc.lastCmd, \"--include\") {\n\t\tt.Fatalf(\"literal path must not be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.cmds[0], shellQuote(\"/project/internal/store/store.go\")) {\n\t\tt.Fatalf(\"expected the counting pass to target the literal path, got %q\", fc.cmds[0])\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project/internal/store/store.go\")) {\n\t\tt.Fatalf(\"expected grep to target the literal path, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"-A 4\") {\n\t\tt.Fatalf(\"expected context_after to be passed through, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"func (s *Store) Get()\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A glob with wildcards must still be passed to --include and the\n// search must target the whole project.\nfunc TestGrepSearchGlobStillUsesInclude(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/foo.go:1\\n\"},\n\t\t{stdout: \"/project/foo.go:1:foo\\n\"},\n\t}}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: \"*.go\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.cmds[0], \"--include='*.go'\") {\n\t\tt.Fatalf(\"expected glob to be passed to --include, got %q\", fc.cmds[0])\n\t}\n\tif !strings.HasSuffix(fc.cmds[0], shellQuote(\"/project\")) {\n\t\tt.Fatalf(\"expected glob search to target /project, got %q\", fc.cmds[0])\n\t}\n}\n\n// max_results is a global cap on matching lines, not a per-file one:\n// with matches in several files, the extraction pass spends the\n// budget file by file and stops once it is exhausted.\nfunc TestGrepSearchMaxResultsIsGlobal(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/a.go:3\\n/project/b.go:3\\n\"},\n\t\t{stdout: \"/project/a.go:1:x\\n/project/a.go:2:x\\n/project/a.go:3:x\\n\"},\n\t\t{stdout: \"/project/b.go:1:x\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"x\", MaxResults: 4})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif len(fc.cmds) != 3 {\n\t\tt.Fatalf(\"expected one counting pass plus two extraction passes, got %d commands: %v\", len(fc.cmds), fc.cmds)\n\t}\n\tif !strings.Contains(fc.cmds[1], \"-m 3\") || !strings.HasSuffix(fc.cmds[1], shellQuote(\"/project/a.go\")) {\n\t\tt.Fatalf(\"expected the first file to take all 3 of its matches, got %q\", fc.cmds[1])\n\t}\n\tif !strings.Contains(fc.cmds[2], \"-m 1\") || !strings.HasSuffix(fc.cmds[2], shellQuote(\"/project/b.go\")) {\n\t\tt.Fatalf(\"expected the second file to take only the remaining 1 match, got %q\", fc.cmds[2])\n\t}\n\tfor _, cmd := range fc.cmds {\n\t\tif strings.Contains(cmd, \"head\") {\n\t\t\tt.Fatalf(\"expected no head pipe in the commands, got %q\", cmd)\n\t\t}\n\t}\n\n\twant := \"/project/a.go:1:x\\n/project/a.go:2:x\\n/project/a.go:3:x\\n/project/b.go:1:x\\n\"\n\tif out != want {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n}\n\n// An omitted max_results (zero) falls back to the default budget of\n// 100 matching lines.\nfunc TestGrepSearchDefaultMaxResults(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/foo.go:150\\n\"},\n\t\t{stdout: \"/project/foo.go:1:foo\\n\"},\n\t}}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"-m 100\") {\n\t\tt.Fatalf(\"expected the default budget of 100 to cap the extraction, got %q\", fc.lastCmd)\n\t}\n}\n\n// With context lines, grep separates the output of different files\n// with a \"--\" line; the per-file extraction must reproduce that.\nfunc TestGrepSearchContextSeparatesFiles(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/a.go:1\\n/project/b.go:1\\n\"},\n\t\t{stdout: \"/project/a.go:1:x\\n/project/a.go-2:y\\n\"},\n\t\t{stdout: \"/project/b.go:1:x\\n/project/b.go-2:y\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"x\", ContextAfter: 1})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\twant := \"/project/a.go:1:x\\n/project/a.go-2:y\\n--\\n/project/b.go:1:x\\n/project/b.go-2:y\\n\"\n\tif out != want {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n}\n\nfunc TestParseCountLine(t *testing.T) {\n\tcases := []struct {\n\t\tline string\n\t\tpath string\n\t\tn int\n\t\tok bool\n\t}{\n\t\t{\"/project/foo.go:3\", \"/project/foo.go\", 3, true},\n\t\t{\"/project/foo bar.go:1\", \"/project/foo bar.go\", 1, true},\n\t\t{\"/project/we:ird.go:2\", \"/project/we:ird.go\", 2, true},\n\t\t{\"/project/foo.go:0\", \"\", 0, false},\n\t\t{\"\", \"\", 0, false},\n\t\t{\"/project/foo.go\", \"\", 0, false},\n\t}\n\tfor _, tc := range cases {\n\t\tfc, ok := parseCountLine(tc.line)\n\t\tif ok != tc.ok || (ok && (fc.path != tc.path || fc.count != tc.n)) {\n\t\t\tt.Errorf(\"parseCountLine(%q) = (%q, %d, %v), want (%q, %d, %v)\",\n\t\t\t\ttc.line, fc.path, fc.count, ok, tc.path, tc.n, tc.ok)\n\t\t}\n\t}\n}\n\n// grep -c prints a \":0\" line for every non-matching file even when it\n// exits 1; those must not be mistaken for matches, and no extraction\n// pass may run.\nfunc TestGrepSearchNoMatchesZeroCounts(t *testing.T) {\n\tfc := &fakeContext{\n\t\tstdout: \"/project/a.go:0\\n/project/b.go:0\\n\",\n\t\terr: fmt.Errorf(\"exit status 1\"),\n\t}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"nomatch\"})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"No matches found.\" {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n\tif len(fc.cmds) != 1 {\n\t\tt.Fatalf(\"expected only the counting pass to run, got %d commands\", len(fc.cmds))\n\t}\n}\n\n// A grep failure with a diagnostic (e.g. a bad regex) must surface as\n// an error, not be swallowed as \"no matches\".\nfunc TestGrepSearchBadRegexErrors(t *testing.T) {\n\tfc := &fakeContext{\n\t\tstderr: \"grep: Unmatched ( or (\\n\",\n\t\terr: fmt.Errorf(\"exit status 2\"),\n\t}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo(\"}); err == nil {\n\t\tt.Fatal(\"expected an error for a bad regex\")\n\t}\n}"}

Arguments

{"find":"func TestGrepSearchUsesExtendedRegex(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo|bar\\n\"}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: `foo|bar`})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"grep -Rn -I -H -E\") {\n\t\tt.Fatalf(\"expected grep to be invoked with -E (extended regex), got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"foo|bar\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A literal file path in the glob parameter (no wildcards) must be\n// searched directly, not passed to --include, which globs basenames\n// and would never match a full path.\nfunc TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/internal/store/store.go:1:func (s *Store) Get() {}\\n\"}\n\n\tout, err := grepSearch(fc, grepSearchParams{\n\t\tPattern:      `^func \\(s \\*Store\\)`,\n\t\tGlob:         \"internal/store/store.go\",\n\t\tContextAfter: 4,\n\t})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif strings.Contains(fc.lastCmd, \"--include\") {\n\t\tt.Fatalf(\"literal path must not be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project/internal/store/store.go\")) {\n\t\tt.Fatalf(\"expected grep to target the literal path, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"-A 4\") {\n\t\tt.Fatalf(\"expected context_after to be passed through, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"func (s *Store) Get()\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A glob with wildcards must still be passed to --include and the\n// search must target the whole project.\nfunc TestGrepSearchGlobStillUsesInclude(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: \"*.go\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--include='*.go'\") {\n\t\tt.Fatalf(\"expected glob to be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project\")) {\n\t\tt.Fatalf(\"expected glob search to target /project, got %q\", fc.lastCmd)\n\t}\n}\n\n// max_results must cap the number of matching lines via grep's\n// --max-count, not the number of raw output lines via a head pipe:\n// with context lines, a single match spans several lines, so head\n// would silently drop matches.\nfunc TestGrepSearchLimitsMatchesNotLines(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", MaxResults: 5, ContextAfter: 2}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--max-count=5\") {\n\t\tt.Fatalf(\"expected max_results to be passed to grep as --max-count, got %q\", fc.lastCmd)\n\t}\n\tif strings.Contains(fc.lastCmd, \"head\") {\n\t\tt.Fatalf(\"expected no head pipe in the command, got %q\", fc.lastCmd)\n\t}\n}\n\n// An omitted max_results (zero) falls back to the default of 100.\nfunc TestGrepSearchDefaultMaxResults(t *testing.T) {\n\tfc := &fakeContext{stdout: \"/project/foo.go:1:foo\\n\"}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"--max-count=100\") {\n\t\tt.Fatalf(\"expected the default --max-count=100, got %q\", fc.lastCmd)\n\t}\n}","path":"/project/internal/tools/tools_test.go","replace":"func TestGrepSearchUsesExtendedRegex(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/foo.go:1\\n\"},\n\t\t{stdout: \"/project/foo.go:1:foo|bar\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: `foo|bar`})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif !strings.Contains(fc.cmds[0], \"grep -I -H -E\") {\n\t\tt.Fatalf(\"expected grep to be invoked with -E (extended regex), got %q\", fc.cmds[0])\n\t}\n\tif !strings.Contains(fc.cmds[0], \"-c\") {\n\t\tt.Fatalf(\"expected the counting pass to use grep -c, got %q\", fc.cmds[0])\n\t}\n\tif !strings.Contains(out, \"foo|bar\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A literal file path in the glob parameter (no wildcards) must be\n// searched directly, not passed to --include, which globs basenames\n// and would never match a full path.\nfunc TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/internal/store/store.go:1\\n\"},\n\t\t{stdout: \"/project/internal/store/store.go:1:func (s *Store) Get() {}\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{\n\t\tPattern:      `^func \\(s \\*Store\\)`,\n\t\tGlob:         \"internal/store/store.go\",\n\t\tContextAfter: 4,\n\t})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif strings.Contains(fc.lastCmd, \"--include\") {\n\t\tt.Fatalf(\"literal path must not be passed to --include, got %q\", fc.lastCmd)\n\t}\n\tif !strings.HasSuffix(fc.cmds[0], shellQuote(\"/project/internal/store/store.go\")) {\n\t\tt.Fatalf(\"expected the counting pass to target the literal path, got %q\", fc.cmds[0])\n\t}\n\tif !strings.HasSuffix(fc.lastCmd, shellQuote(\"/project/internal/store/store.go\")) {\n\t\tt.Fatalf(\"expected grep to target the literal path, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(fc.lastCmd, \"-A 4\") {\n\t\tt.Fatalf(\"expected context_after to be passed through, got %q\", fc.lastCmd)\n\t}\n\tif !strings.Contains(out, \"func (s *Store) Get()\") {\n\t\tt.Fatalf(\"unexpected result: %s\", out)\n\t}\n}\n\n// A glob with wildcards must still be passed to --include and the\n// search must target the whole project.\nfunc TestGrepSearchGlobStillUsesInclude(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/foo.go:1\\n\"},\n\t\t{stdout: \"/project/foo.go:1:foo\\n\"},\n\t}}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: \"*.go\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.cmds[0], \"--include='*.go'\") {\n\t\tt.Fatalf(\"expected glob to be passed to --include, got %q\", fc.cmds[0])\n\t}\n\tif !strings.HasSuffix(fc.cmds[0], shellQuote(\"/project\")) {\n\t\tt.Fatalf(\"expected glob search to target /project, got %q\", fc.cmds[0])\n\t}\n}\n\n// max_results is a global cap on matching lines, not a per-file one:\n// with matches in several files, the extraction pass spends the\n// budget file by file and stops once it is exhausted.\nfunc TestGrepSearchMaxResultsIsGlobal(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/a.go:3\\n/project/b.go:3\\n\"},\n\t\t{stdout: \"/project/a.go:1:x\\n/project/a.go:2:x\\n/project/a.go:3:x\\n\"},\n\t\t{stdout: \"/project/b.go:1:x\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"x\", MaxResults: 4})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif len(fc.cmds) != 3 {\n\t\tt.Fatalf(\"expected one counting pass plus two extraction passes, got %d commands: %v\", len(fc.cmds), fc.cmds)\n\t}\n\tif !strings.Contains(fc.cmds[1], \"-m 3\") || !strings.HasSuffix(fc.cmds[1], shellQuote(\"/project/a.go\")) {\n\t\tt.Fatalf(\"expected the first file to take all 3 of its matches, got %q\", fc.cmds[1])\n\t}\n\tif !strings.Contains(fc.cmds[2], \"-m 1\") || !strings.HasSuffix(fc.cmds[2], shellQuote(\"/project/b.go\")) {\n\t\tt.Fatalf(\"expected the second file to take only the remaining 1 match, got %q\", fc.cmds[2])\n\t}\n\tfor _, cmd := range fc.cmds {\n\t\tif strings.Contains(cmd, \"head\") {\n\t\t\tt.Fatalf(\"expected no head pipe in the commands, got %q\", cmd)\n\t\t}\n\t}\n\n\twant := \"/project/a.go:1:x\\n/project/a.go:2:x\\n/project/a.go:3:x\\n/project/b.go:1:x\\n\"\n\tif out != want {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n}\n\n// An omitted max_results (zero) falls back to the default budget of\n// 100 matching lines.\nfunc TestGrepSearchDefaultMaxResults(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/foo.go:150\\n\"},\n\t\t{stdout: \"/project/foo.go:1:foo\\n\"},\n\t}}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\"}); err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\tif !strings.Contains(fc.lastCmd, \"-m 100\") {\n\t\tt.Fatalf(\"expected the default budget of 100 to cap the extraction, got %q\", fc.lastCmd)\n\t}\n}\n\n// With context lines, grep separates the output of different files\n// with a \"--\" line; the per-file extraction must reproduce that.\nfunc TestGrepSearchContextSeparatesFiles(t *testing.T) {\n\tfc := &fakeContext{responses: []execResponse{\n\t\t{stdout: \"/project/a.go:1\\n/project/b.go:1\\n\"},\n\t\t{stdout: \"/project/a.go:1:x\\n/project/a.go-2:y\\n\"},\n\t\t{stdout: \"/project/b.go:1:x\\n/project/b.go-2:y\\n\"},\n\t}}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"x\", ContextAfter: 1})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\n\twant := \"/project/a.go:1:x\\n/project/a.go-2:y\\n--\\n/project/b.go:1:x\\n/project/b.go-2:y\\n\"\n\tif out != want {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n}\n\nfunc TestParseCountLine(t *testing.T) {\n\tcases := []struct {\n\t\tline string\n\t\tpath string\n\t\tn    int\n\t\tok   bool\n\t}{\n\t\t{\"/project/foo.go:3\", \"/project/foo.go\", 3, true},\n\t\t{\"/project/foo bar.go:1\", \"/project/foo bar.go\", 1, true},\n\t\t{\"/project/we:ird.go:2\", \"/project/we:ird.go\", 2, true},\n\t\t{\"/project/foo.go:0\", \"\", 0, false},\n\t\t{\"\", \"\", 0, false},\n\t\t{\"/project/foo.go\", \"\", 0, false},\n\t}\n\tfor _, tc := range cases {\n\t\tfc, ok := parseCountLine(tc.line)\n\t\tif ok != tc.ok || (ok && (fc.path != tc.path || fc.count != tc.n)) {\n\t\t\tt.Errorf(\"parseCountLine(%q) = (%q, %d, %v), want (%q, %d, %v)\",\n\t\t\t\ttc.line, fc.path, fc.count, ok, tc.path, tc.n, tc.ok)\n\t\t}\n\t}\n}\n\n// grep -c prints a \":0\" line for every non-matching file even when it\n// exits 1; those must not be mistaken for matches, and no extraction\n// pass may run.\nfunc TestGrepSearchNoMatchesZeroCounts(t *testing.T) {\n\tfc := &fakeContext{\n\t\tstdout: \"/project/a.go:0\\n/project/b.go:0\\n\",\n\t\terr:    fmt.Errorf(\"exit status 1\"),\n\t}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"nomatch\"})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"No matches found.\" {\n\t\tt.Fatalf(\"unexpected result: %q\", out)\n\t}\n\tif len(fc.cmds) != 1 {\n\t\tt.Fatalf(\"expected only the counting pass to run, got %d commands\", len(fc.cmds))\n\t}\n}\n\n// A grep failure with a diagnostic (e.g. a bad regex) must surface as\n// an error, not be swallowed as \"no matches\".\nfunc TestGrepSearchBadRegexErrors(t *testing.T) {\n\tfc := &fakeContext{\n\t\tstderr: \"grep: Unmatched ( or (\\n\",\n\t\terr:    fmt.Errorf(\"exit status 2\"),\n\t}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo(\"}); err == nil {\n\t\tt.Fatal(\"expected an error for a bad regex\")\n\t}\n}"}

Result

1 occurrences replaced

Thinking

Next, I'll run the build, vet, and tests.

Now build, vet, and run the full test suite:

Tool 🔧 bash {"command":"cd /project && go build ./... && go vet ./... && go test ./... 2>&1 | tail -20"}

Arguments

{"command":"cd /project && go build ./... && go vet ./... && go test ./... 2>&1 | tail -20"}

Result

?   	github.com/abrander/zoo/cmd/zoo	[no test files]
ok  	github.com/abrander/zoo/internal/agentrun	0.022s
ok  	github.com/abrander/zoo/internal/config	0.006s
ok  	github.com/abrander/zoo/internal/forgejo	1.282s
ok  	github.com/abrander/zoo/internal/livelog	0.052s
ok  	github.com/abrander/zoo/internal/llm	0.003s
ok  	github.com/abrander/zoo/internal/scheduler	2.912s
ok  	github.com/abrander/zoo/internal/store	1.799s
ok  	github.com/abrander/zoo/internal/tools	0.003s
ok  	github.com/abrander/zoo/internal/web	1.187s
go: downloading github.com/docker/docker v28.5.2+incompatible
go: downloading github.com/hashicorp/hcl/v2 v2.24.0
go: downloading codeberg.org/mvdkleijn/forgejo-sdk/forgejo/v2 v2.2.0
go: downloading github.com/google/uuid v1.6.0
go: downloading modernc.org/sqlite v1.56.0
go: downloading github.com/docker/go-connections v0.8.1
go: downloading github.com/docker/go-units v0.5.0
go: downloading github.com/moby/docker-image-spec v1.3.1
go: downloading github.com/opencontainers/image-spec v1.1.1
go: downloading github.com/containerd/errdefs v1.0.0
go: downloading github.com/containerd/errdefs/pkg v0.3.0
go: downloading github.com/distribution/reference v0.6.0
go: downloading github.com/opencontainers/go-digest v1.0.0
go: downloading github.com/pkg/errors v0.9.1
go: downloading go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.70.0
go: downloading go.opentelemetry.io/otel/trace v1.45.0
go: downloading go.opentelemetry.io/otel v1.45.0
go: downloading github.com/42wim/httpsig v1.2.3
go: downloading github.com/go-fed/httpsig v1.1.0
go: downloading github.com/hashicorp/go-version v1.7.0
go: downloading golang.org/x/crypto v0.39.0
go: downloading github.com/felixge/httpsnoop v1.1.0
go: downloading go.opentelemetry.io/otel/metric v1.45.0
go: downloading github.com/agext/levenshtein v1.2.1
go: downloading github.com/apparentlymart/go-textseg/v15 v15.0.0
go: downloading github.com/mitchellh/go-wordwrap v1.0.1
go: downloading github.com/zclconf/go-cty v1.16.3
go: downloading github.com/go-logr/logr v1.4.4
go: downloading golang.org/x/sys v0.47.0
go: downloading github.com/google/go-cmp v0.7.0
go: downloading github.com/go-logr/stdr v1.2.2
go: downloading go.opentelemetry.io/auto/sdk v1.2.1
go: downloading github.com/cespare/xxhash/v2 v2.3.0
go: downloading golang.org/x/text v0.40.0
go: downloading modernc.org/libc v1.74.4
go: downloading github.com/dustin/go-humanize v1.0.1
go: downloading modernc.org/mathutil v1.7.1
go: downloading modernc.org/memory v1.11.0
go: downloading github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec

Thinking

All tests passed. Next, I'll run the specific grep tests in verbose mode to confirm they're actually being executed, and then do an end-to-end sanity check of the actual logic against real grep. Since the tool shells out, I could simulate the two-pass flow in a shell script against a test directory to verify the following: 1. That the global cap works across files. 2. That the output format matches a single grep run (including the `--` separator). 3. Edge cases: no matches, invalid regex, literal paths. Actually, a better approach: write a small Go test program that uses the real `sh -c` execution? That's what the production Context does. Let me check how the real context executes commands (internal/agentrun?) — maybe I can write a quick integration test harness. Let me look at how the real Context is implemented.

All tests passed. I'll run the grep tests in verbose mode, and further verify the two-pass logic end-to-end against **actual grep** by simulating the exact command sequence that the tool constructs:

Tool 🔧 bash {"command":"cd /project && go test ./internal/tools/ -run 'GrepSearch|ParseCountLine' -v 2>&1 | grep -E '^(=== RUN|--- (PASS|FAIL)|PASS|FAIL|ok)'"}

Arguments

{"command":"cd /project && go test ./internal/tools/ -run 'GrepSearch|ParseCountLine' -v 2>&1 | grep -E '^(=== RUN|--- (PASS|FAIL)|PASS|FAIL|ok)'"}

Result

=== RUN   TestGrepSearchUsesExtendedRegex
--- PASS: TestGrepSearchUsesExtendedRegex (0.00s)
=== RUN   TestGrepSearchLiteralPathSearchesFileDirectly
--- PASS: TestGrepSearchLiteralPathSearchesFileDirectly (0.00s)
=== RUN   TestGrepSearchGlobStillUsesInclude
--- PASS: TestGrepSearchGlobStillUsesInclude (0.00s)
=== RUN   TestGrepSearchMaxResultsIsGlobal
--- PASS: TestGrepSearchMaxResultsIsGlobal (0.00s)
=== RUN   TestGrepSearchDefaultMaxResults
--- PASS: TestGrepSearchDefaultMaxResults (0.00s)
=== RUN   TestGrepSearchContextSeparatesFiles
--- PASS: TestGrepSearchContextSeparatesFiles (0.00s)
=== RUN   TestParseCountLine
--- PASS: TestParseCountLine (0.00s)
=== RUN   TestGrepSearchNoMatchesZeroCounts
--- PASS: TestGrepSearchNoMatchesZeroCounts (0.00s)
=== RUN   TestGrepSearchBadRegexErrors
--- PASS: TestGrepSearchBadRegexErrors (0.00s)
=== RUN   TestGrepSearchNoMatches
--- PASS: TestGrepSearchNoMatches (0.00s)
PASS
ok  	github.com/abrander/zoo/internal/tools	0.003s

Tool 🔧 bash {"command":"cd /tmp/greptest && cat > e2e.sh <<'EOF'\n#!/bin/sh\n# Simulates the exact two-pass command sequence grep_search builds,\n# against real grep, and compares with a single grep run.\nset -e\ncd /tmp/greptest\nPATTERN='foo'\nMAX=4\n\n# Pass 1: counts\nCOUNTS=$(grep -I -H -E -i -R -c -e \"$PATTERN\" /tmp/greptest || true)\necho \"--- pass 1 output:\"\necho \"$COUNTS\"\n\n# Pass 2: per-file extraction with global budget (budget=4)\nBUDGET=$MAX\nOUT=\"\"\nSEP=\"\"\nfor line in $COUNTS; do\n [ -z \"$line\" ] && continue\n PATH_=${line%:*}\n N=${line##*:}\n case \"$N\" in ''|*[!0-9]*) continue;; esac\n [ \"$N\" -le 0 ] && continue\n [ \"$BUDGET\" -le 0 ] && break\n M=$N; [ \"$M\" -gt \"$BUDGET\" ] && M=$BUDGET\n FILEOUT=$(grep -I -H -E -i -n -m \"$M\" -e \"$PATTERN\" \"$PATH_\" || true)\n [ -z \"$FILEOUT\" ] && continue\n OUT=\"${OUT}${SEP}${FILEOUT}\n\"\n SEP=\"--\n\"\n BUDGET=$((BUDGET - M))\ndone\necho \"--- two-pass result (max 4, -A 1 would need context flags; here plain):\"\nprintf '%s' \"$OUT\"\necho \"--- single grep reference (what the format should look like):\"\ngrep -I -H -E -i -R -n -e \"$PATTERN\" /tmp/greptest\nEOF\nsh e2e.sh"}

Arguments

{"command":"cd /tmp/greptest && cat > e2e.sh <<'EOF'\n#!/bin/sh\n# Simulates the exact two-pass command sequence grep_search builds,\n# against real grep, and compares with a single grep run.\nset -e\ncd /tmp/greptest\nPATTERN='foo'\nMAX=4\n\n# Pass 1: counts\nCOUNTS=$(grep -I -H -E -i -R -c -e \"$PATTERN\" /tmp/greptest || true)\necho \"--- pass 1 output:\"\necho \"$COUNTS\"\n\n# Pass 2: per-file extraction with global budget (budget=4)\nBUDGET=$MAX\nOUT=\"\"\nSEP=\"\"\nfor line in $COUNTS; do\n  [ -z \"$line\" ] && continue\n  PATH_=${line%:*}\n  N=${line##*:}\n  case \"$N\" in ''|*[!0-9]*) continue;; esac\n  [ \"$N\" -le 0 ] && continue\n  [ \"$BUDGET\" -le 0 ] && break\n  M=$N; [ \"$M\" -gt \"$BUDGET\" ] && M=$BUDGET\n  FILEOUT=$(grep -I -H -E -i -n -m \"$M\" -e \"$PATTERN\" \"$PATH_\" || true)\n  [ -z \"$FILEOUT\" ] && continue\n  OUT=\"${OUT}${SEP}${FILEOUT}\n\"\n  SEP=\"--\n\"\n  BUDGET=$((BUDGET - M))\ndone\necho \"--- two-pass result (max 4, -A 1 would need context flags; here plain):\"\nprintf '%s' \"$OUT\"\necho \"--- single grep reference (what the format should look like):\"\ngrep -I -H -E -i -R -n -e \"$PATTERN\" /tmp/greptest\nEOF\nsh e2e.sh"}

Result

--- pass 1 output:
/tmp/greptest/c.txt:0
/tmp/greptest/sub/b.txt:1
/tmp/greptest/d with space.txt:1
/tmp/greptest/a.txt:3
/tmp/greptest/e2e.sh:1
--- two-pass result (max 4, -A 1 would need context flags; here plain):
/tmp/greptest/sub/b.txt:1:foo
--
/tmp/greptest/a.txt:1:foo
/tmp/greptest/a.txt:3:foo
/tmp/greptest/a.txt:4:foo
--- single grep reference (what the format should look like):
/tmp/greptest/sub/b.txt:1:foo
/tmp/greptest/d with space.txt:1:foo foo
/tmp/greptest/a.txt:1:foo
/tmp/greptest/a.txt:3:foo
/tmp/greptest/a.txt:4:foo
/tmp/greptest/e2e.sh:6:PATTERN='foo'
grep: space.txt: No such file or directory

Thinking

The e2e simulation has a bug in my shell script (word splitting on "d with space.txt" — `for line in $COUNTS` splits on spaces), and also, my script unconditionally adds a `--` separator, but the Go code only adds it when context is enabled. Also, e2e.sh itself got picked up by the search (because it contains 'foo'). These are artifacts of my quick-and-dirty script, not of the Go code. Let me write a proper e2e verification in Go instead — a small Go program that implements the same logic as the tool (or, better yet, actually calls the real `grepSearch` function using a real Exec context that runs `sh -c` in this container). That would be the true end-to-end test. Let me check what the real Context implementation looks like — it's in internal/agentrun or somewhere. Let me search for the implementation of the tools.Context interface.

The shell simulation has artifacts (word splitting on filenames containing spaces, and my script unconditionally adding `--`). Let's do a proper end-to-end verification: call the **actual `grepSearch`** function with a real `sh -c` Exec context. First, let's find the actual Context implementation:

Tool 🔧 grep_search {"context_after":6,"query":"func .*Exec\$ctx context.Context, command string\$"}

Arguments

{"context_after":6,"query":"func .*Exec\\(ctx context.Context, command string\\)"}

Result

/project/internal/tools/tools_test.go:56:func (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {
/project/internal/tools/tools_test.go-57-	f.lastCmd = command
/project/internal/tools/tools_test.go-58-	f.cmds = append(f.cmds, command)
/project/internal/tools/tools_test.go-59-	if len(f.responses) > 0 {
/project/internal/tools/tools_test.go-60-		i := len(f.cmds) - 1
/project/internal/tools/tools_test.go-61-		if i >= len(f.responses) {
/project/internal/tools/tools_test.go-62-			i = len(f.responses) - 1
--
/project/internal/agentrun/context.go:22:func (c *runContext) Exec(ctx context.Context, command string) (string, string, error) {
/project/internal/agentrun/context.go-23-	stdout, stderr, exitCode, err := c.docker.exec(ctx, c.containerID, command)
/project/internal/agentrun/context.go-24-
/project/internal/agentrun/context.go-25-	if err != nil {
/project/internal/agentrun/context.go-26-		return stdout, stderr, err
/project/internal/agentrun/context.go-27-	}
/project/internal/agentrun/context.go-28-

Thinking

The actual context is docker-based (`c.docker.exec`). In this container, we can't easily spin up a nested docker container. Instead, I'll write a throwaway Go test (won't commit) that implements a local `sh -c` Exec and runs `grepSearch` against a real fixture directory. But `grepSearch` is unexported, so the test needs to be placed inside the `tools` package. I'll create a temporary test file, run it, then delete it. Wait — the tool hardcodes the target `/project` as the default. My fixture is at /tmp/greptest. But I can use the `Glob` parameter with a literal path! `resolvePath` — let me check what it does for a path like "/tmp/greptest": looking at shell.go: ```go func resolvePath(path string) string { if path == "" { return "/project" } if path == "." || path == "./" { return "/project" } if strings.HasPrefix(path, "/project/") { return path } ... ``` Let me read the whole function to check how paths outside /project are handled.

Tool 🔧 read_file {"end_line":52,"path":"/project/internal/tools/shell.go","start_line":1}

Arguments

{"end_line":52,"path":"/project/internal/tools/shell.go","start_line":1}

Result

{"path":"/project/internal/tools/shell.go","content":"package tools\n\nimport (\n\t\"context\"\n\t\"encoding/base64\"\n\t\"fmt\"\n\t\"strings\"\n)\n\n// shellQuote wraps s in single quotes for safe interpolation into a `sh\n// -c` command string, escaping any embedded single quotes.\nfunc shellQuote(s string) string {\n\treturn \"'\" + strings.ReplaceAll(s, \"'\", `'\\''`) + \"'\"\n}\n\nfunc resolvePath(path string) string {\n\tif path == \"\" {\n\t\treturn \"/project\"\n\t}\n\n\tif path == \".\" || path == \"./\" {\n\t\treturn \"/project\"\n\t}\n\n\tif strings.HasPrefix(path, \"/project/\") {\n\t\treturn path\n\t}\n\n\tif !strings.HasPrefix(path, \"/\") {\n\t\treturn \"/project/\" + strings.TrimPrefix(path, \"/\")\n\t}\n\n\treturn path\n}\n\n// combineOutput merges a command's stdout and stderr into the single\n// string a tool result presents: stdout first, then stderr if the\n// command wrote to both.\nfunc combineOutput(stdout, stderr string) string {\n\tswitch {\n\tcase stdout == \"\":\n\t\treturn stderr\n\tcase stderr == \"\":\n\t\treturn stdout\n\tcase strings.HasSuffix(stdout, \"\\n\"):\n\t\treturn stdout + stderr\n\tdefault:\n\t\treturn stdout + \"\\n\" + stderr\n\t}\n}\n\n// execErr wraps an Exec failure with whatever the command printed, so","start_line":1,"end_line":52,"total_lines":95,"truncated":true}

Thinking

`resolvePath` passes absolute paths through as-is (`return path`). So we can specify `/tmp/greptest` as a literal glob and run the real `grepSearch` against an actual fixture directory using a local `sh -c` Exec. Let me write a temporary in-package test using a real local Exec, run it, and then delete it. This will give us a true end-to-end verification of the two-pass logic against real grep: Test scenarios: 1. **Global cap across files**: fixture with a.txt (3 matches), sub/b.txt (1), d with space.txt (1), c.txt (0). max_results=4 → expect exactly 4 matching lines in total, in traversal order, with no `--` (no context). 2. **Global cap with context**: max_results=2, -A 1 → 2 matching lines + their context, `--` between files. 3. **No context, no cap (default)**: all 5 matches, no `--`. 4. **Format equivalence**: for a case where the cap doesn't kick in, the two-pass output should be byte-identical to a single `grep -Rn -I -H -E -i -A 1` run. 5. **No matches** → "No matches found." 6. **Invalid regex** → error. Let me write this as a temporary test file `grep_search_e2e_temp_test.go` inside the tools package.

Since `resolvePath` passes absolute paths through as-is, we can run the actual `grepSearch` against the real fixture directory. Let's write a temporary end-to-end test (to be deleted after verification):

Tool 🔧 write_file {"content":"package tools\n\n// Temporary end-to-end verification against real grep via local\n// `sh -c`. Deleted after manual verification.\n\nimport (\n\t\"context\"\n\t\"os/exec\"\n\t\"strings\"\n\t\"testing\"\n)\n\ntype localContext struct{}\n\nfunc (localContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tcmd := exec.CommandContext(ctx, \"sh\", \"-c\", command)\n\tvar out, errb strings.Builder\n\tcmd.Stdout = &out\n\tcmd.Stderr = &errb\n\terr := cmd.Run()\n\treturn out.String(), errb.String(), err\n}\n\nconst e2eDir = \"/tmp/greptest\"\n\nfunc TestE2EGlobalCapAcrossFiles(t *testing.T) {\n\tfc := localContext{}\n\n\t// 5 matches total: a.txt x3, sub/b.txt x1, d with space.txt x1.\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: e2eDir, MaxResults: 4})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif n := countMatchLines(out); n != 4 {\n\t\tt.Fatalf(\"expected exactly 4 matching lines, got %d:\\n%s\", n, out)\n\t}\n\tif strings.Contains(out, \"--\") {\n\t\tt.Fatalf(\"no context: no -- separators expected:\\n%s\", out)\n\t}\n\tt.Logf(\"output:\\n%s\", out)\n}\n\nfunc TestE2EGlobalCapWithContext(t *testing.T) {\n\tfc := localContext{}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: e2eDir, MaxResults: 2, ContextAfter: 1})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif n := countMatchLines(out); n != 2 {\n\t\tt.Fatalf(\"expected exactly 2 matching lines, got %d:\\n%s\", n, out)\n\t}\n\t// The second match is in a different file than the first, so the\n\t// file outputs must be separated by a -- line.\n\tif !strings.Contains(out, \"\\n--\\n\") {\n\t\tt.Fatalf(\"expected a -- separator between files:\\n%s\", out)\n\t}\n\tt.Logf(\"output:\\n%s\", out)\n}\n\nfunc TestE2EUnderCapMatchesSingleGrep(t *testing.T) {\n\tfc := localContext{}\n\n\t// Cap above the total: output must be byte-identical to a single\n\t// grep run with the same flags.\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: e2eDir, MaxResults: 10, ContextAfter: 1})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tref := exec.Command(\"grep\", \"-I\", \"-H\", \"-E\", \"-i\", \"-R\", \"-n\", \"-A\", \"1\", \"-e\", \"foo\", e2eDir)\n\trefOut, err := ref.CombinedOutput()\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != string(refOut) {\n\t\tt.Fatalf(\"two-pass output differs from single grep:\\n--- two-pass ---\\n%s\\n--- single ---\\n%s\", out, refOut)\n\t}\n}\n\nfunc TestE2ENoMatches(t *testing.T) {\n\tfc := localContext{}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"zzz-no-such\", Glob: e2eDir})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"No matches found.\" {\n\t\tt.Fatalf(\"unexpected: %q\", out)\n\t}\n}\n\nfunc TestE2EBadRegex(t *testing.T) {\n\tfc := localContext{}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo(\", Glob: e2eDir}); err == nil {\n\t\tt.Fatal(\"expected an error for a bad regex\")\n\t}\n}\n\n// countMatchLines counts lines of the form path:lineno:content,\n// i.e. real matches (context lines use path-lineno-content, and --\n// is a separator).\nfunc countMatchLines(s string) int {\n\tn := 0\n\tfor _, line := range strings.Split(strings.TrimRight(s, \"\\n\"), \"\\n\") {\n\t\tif line == \"--\" {\n\t\t\tcontinue\n\t\t}\n\t\t// match line: something:digits: ; context line: something-digits-\n\t\ti := strings.LastIndex(line, \":\")\n\t\tif i <= 0 {\n\t\t\tcontinue\n\t\t}\n\t\trest := line[i+1:]\n\t\tif len(rest) > 0 && rest[0] >= '0' && rest[0] <= '9' {\n\t\t\t// verify the field before the last colon is digits too\n\t\t\tj := i\n\t\t\tfor j > 0 && line[j-1] >= '0' && line[j-1] <= '9' {\n\t\t\t\tj--\n\t\t\t}\n\t\t\tif j < i && line[j-1] == ':' {\n\t\t\t\tn++\n\t\t\t}\n\t\t}\n\t}\n\treturn n\n}\n","path":"/project/internal/tools/grep_search_e2e_temp_test.go"}

Arguments

{"content":"package tools\n\n// Temporary end-to-end verification against real grep via local\n// `sh -c`. Deleted after manual verification.\n\nimport (\n\t\"context\"\n\t\"os/exec\"\n\t\"strings\"\n\t\"testing\"\n)\n\ntype localContext struct{}\n\nfunc (localContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tcmd := exec.CommandContext(ctx, \"sh\", \"-c\", command)\n\tvar out, errb strings.Builder\n\tcmd.Stdout = &out\n\tcmd.Stderr = &errb\n\terr := cmd.Run()\n\treturn out.String(), errb.String(), err\n}\n\nconst e2eDir = \"/tmp/greptest\"\n\nfunc TestE2EGlobalCapAcrossFiles(t *testing.T) {\n\tfc := localContext{}\n\n\t// 5 matches total: a.txt x3, sub/b.txt x1, d with space.txt x1.\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: e2eDir, MaxResults: 4})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif n := countMatchLines(out); n != 4 {\n\t\tt.Fatalf(\"expected exactly 4 matching lines, got %d:\\n%s\", n, out)\n\t}\n\tif strings.Contains(out, \"--\") {\n\t\tt.Fatalf(\"no context: no -- separators expected:\\n%s\", out)\n\t}\n\tt.Logf(\"output:\\n%s\", out)\n}\n\nfunc TestE2EGlobalCapWithContext(t *testing.T) {\n\tfc := localContext{}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: e2eDir, MaxResults: 2, ContextAfter: 1})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif n := countMatchLines(out); n != 2 {\n\t\tt.Fatalf(\"expected exactly 2 matching lines, got %d:\\n%s\", n, out)\n\t}\n\t// The second match is in a different file than the first, so the\n\t// file outputs must be separated by a -- line.\n\tif !strings.Contains(out, \"\\n--\\n\") {\n\t\tt.Fatalf(\"expected a -- separator between files:\\n%s\", out)\n\t}\n\tt.Logf(\"output:\\n%s\", out)\n}\n\nfunc TestE2EUnderCapMatchesSingleGrep(t *testing.T) {\n\tfc := localContext{}\n\n\t// Cap above the total: output must be byte-identical to a single\n\t// grep run with the same flags.\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"foo\", Glob: e2eDir, MaxResults: 10, ContextAfter: 1})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tref := exec.Command(\"grep\", \"-I\", \"-H\", \"-E\", \"-i\", \"-R\", \"-n\", \"-A\", \"1\", \"-e\", \"foo\", e2eDir)\n\trefOut, err := ref.CombinedOutput()\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != string(refOut) {\n\t\tt.Fatalf(\"two-pass output differs from single grep:\\n--- two-pass ---\\n%s\\n--- single ---\\n%s\", out, refOut)\n\t}\n}\n\nfunc TestE2ENoMatches(t *testing.T) {\n\tfc := localContext{}\n\n\tout, err := grepSearch(fc, grepSearchParams{Pattern: \"zzz-no-such\", Glob: e2eDir})\n\tif err != nil {\n\t\tt.Fatal(err)\n\t}\n\tif out != \"No matches found.\" {\n\t\tt.Fatalf(\"unexpected: %q\", out)\n\t}\n}\n\nfunc TestE2EBadRegex(t *testing.T) {\n\tfc := localContext{}\n\n\tif _, err := grepSearch(fc, grepSearchParams{Pattern: \"foo(\", Glob: e2eDir}); err == nil {\n\t\tt.Fatal(\"expected an error for a bad regex\")\n\t}\n}\n\n// countMatchLines counts lines of the form path:lineno:content,\n// i.e. real matches (context lines use path-lineno-content, and --\n// is a separator).\nfunc countMatchLines(s string) int {\n\tn := 0\n\tfor _, line := range strings.Split(strings.TrimRight(s, \"\\n\"), \"\\n\") {\n\t\tif line == \"--\" {\n\t\t\tcontinue\n\t\t}\n\t\t// match line: something:digits: ; context line: something-digits-\n\t\ti := strings.LastIndex(line, \":\")\n\t\tif i <= 0 {\n\t\t\tcontinue\n\t\t}\n\t\trest := line[i+1:]\n\t\tif len(rest) > 0 && rest[0] >= '0' && rest[0] <= '9' {\n\t\t\t// verify the field before the last colon is digits too\n\t\t\tj := i\n\t\t\tfor j > 0 && line[j-1] >= '0' && line[j-1] <= '9' {\n\t\t\t\tj--\n\t\t\t}\n\t\t\tif j < i && line[j-1] == ':' {\n\t\t\t\tn++\n\t\t\t}\n\t\t}\n\t}\n\treturn n\n}\n","path":"/project/internal/tools/grep_search_e2e_temp_test.go"}

Result

OK

Thinking

Wait, my countMatchLines helper is too complex. Let me simplify: in the e2e fixture, the paths don't contain colons, so a match line is `path:lineno:content`, and the line number field is the second-to-last colon-separated field... no wait, the content can contain colons. A simpler approach for this fixture: count lines that don't end with... hmm. Actually, in this fixture, the simplest and most reliable check is: a match line contains `:N:` where N is a line number, and the content is "foo..." — the match content always contains "foo" (case-insensitive). Context lines are lines adjacent to matches — a.txt's lines are foo/bar/foo/foo, so the context lines are "bar" and other "foo" lines... wait, a.txt = `foo\nbar\nfoo\nfoo\n` — matches are lines 1, 3, 4. With -A 1: line 2 (bar) is context after line 1; lines 3, 4 are matches (adjacent, so they get merged). So the context line is `a.txt-2-bar`. It doesn't contain "foo". But in general, context lines can also contain the pattern (in which case they become matches). In this fixture, context lines never contain "foo". So for these specific tests, counting lines containing "foo" (case-insensitive) = counting matches. Let me simplify countMatchLines to count lines containing "foo" — no wait, that's test-specific. Hmm, but the helper is only used in these e2e tests. Let me just count lines matching the regex `^/tmp/greptest/.*:\d+:` — the fixture paths don't contain colons, so this is accurate: the first colon after the path is the line number delimiter. Let me rewrite the helper with a regexp: `^/tmp/greptest/.+:[0-9]+:`.

Let me simplify the match-line counter — the fixture paths contain no colons, so a regex is exact here:

Tool 🔧 edit_file {"find":"// countMatchLines counts lines of the form path:lineno:content,\n// i.e. real matches (context lines use path-lineno-content, and --\n// is a separator).\nfunc countMatchLines(s string) int {\n\tn := 0\n\tfor _, line := range strings.Split(strings.TrimRight(s, \"\\n\"), \"\\n\") {\n\t\tif line == \"--\" {\n\t\t\tcontinue\n\t\t}\n\t\t// match line: something:digits: ; context line: something-digits-\n\t\ti := strings.LastIndex(line, \":\")\n\t\tif i <= 0 {\n\t\t\tcontinue\n\t\t}\n\t\trest := line[i+1:]\n\t\tif len(rest) > 0 && rest[0] >= '0' && rest[0] <= '9' {\n\t\t\t// verify the field before the last colon is digits too\n\t\t\tj := i\n\t\t\tfor j > 0 && line[j-1] >= '0' && line[j-1] <= '9' {\n\t\t\t\tj--\n\t\t\t}\n\t\t\tif j < i && line[j-1] == ':' {\n\t\t\t\tn++\n\t\t\t}\n\t\t}\n\t}\n\treturn n\n}","path":"/project/internal/tools/grep_search_e2e_temp_test.go","replace":"// countMatchLines counts real match lines. The fixture paths contain\n// no colons, so \"path:lineno:\" with the first colon after the path\n// identifies a match exactly (context lines use \"path-lineno-\").\nvar matchLineRE = regexp.MustCompile(`^/tmp/greptest/.+:[0-9]+:`)\n\nfunc countMatchLines(s string) int {\n\tn := 0\n\tfor _, line := range strings.Split(strings.TrimRight(s, \"\\n\"), \"\\n\") {\n\t\tif matchLineRE.MatchString(line) {\n\t\t\tn++\n\t\t}\n\t}\n\treturn n\n}"}

Arguments

{"find":"// countMatchLines counts lines of the form path:lineno:content,\n// i.e. real matches (context lines use path-lineno-content, and --\n// is a separator).\nfunc countMatchLines(s string) int {\n\tn := 0\n\tfor _, line := range strings.Split(strings.TrimRight(s, \"\\n\"), \"\\n\") {\n\t\tif line == \"--\" {\n\t\t\tcontinue\n\t\t}\n\t\t// match line: something:digits: ; context line: something-digits-\n\t\ti := strings.LastIndex(line, \":\")\n\t\tif i <= 0 {\n\t\t\tcontinue\n\t\t}\n\t\trest := line[i+1:]\n\t\tif len(rest) > 0 && rest[0] >= '0' && rest[0] <= '9' {\n\t\t\t// verify the field before the last colon is digits too\n\t\t\tj := i\n\t\t\tfor j > 0 && line[j-1] >= '0' && line[j-1] <= '9' {\n\t\t\t\tj--\n\t\t\t}\n\t\t\tif j < i && line[j-1] == ':' {\n\t\t\t\tn++\n\t\t\t}\n\t\t}\n\t}\n\treturn n\n}","path":"/project/internal/tools/grep_search_e2e_temp_test.go","replace":"// countMatchLines counts real match lines. The fixture paths contain\n// no colons, so \"path:lineno:\" with the first colon after the path\n// identifies a match exactly (context lines use \"path-lineno-\").\nvar matchLineRE = regexp.MustCompile(`^/tmp/greptest/.+:[0-9]+:`)\n\nfunc countMatchLines(s string) int {\n\tn := 0\n\tfor _, line := range strings.Split(strings.TrimRight(s, \"\\n\"), \"\\n\") {\n\t\tif matchLineRE.MatchString(line) {\n\t\t\tn++\n\t\t}\n\t}\n\treturn n\n}"}

Result

1 occurrences replaced

Tool 🔧 edit_file {"find":"import (\n\t\"context\"\n\t\"os/exec\"\n\t\"strings\"\n\t\"testing\"\n)","path":"/project/internal/tools/grep_search_e2e_temp_test.go","replace":"import (\n\t\"context\"\n\t\"os/exec\"\n\t\"regexp\"\n\t\"strings\"\n\t\"testing\"\n)"}

Arguments

{"find":"import (\n\t\"context\"\n\t\"os/exec\"\n\t\"strings\"\n\t\"testing\"\n)","path":"/project/internal/tools/grep_search_e2e_temp_test.go","replace":"import (\n\t\"context\"\n\t\"os/exec\"\n\t\"regexp\"\n\t\"strings\"\n\t\"testing\"\n)"}

Result

1 occurrences replaced

Thinking

Wait a sec, in TestE2EGlobalCapAcrossFiles I'm asserting that there are no `--` when there's no context — but hold on, the fixture directory also contains `e2e.sh` (which contains 'foo' — no wait, what it contains is "PATTERN='foo'" — yes, 'foo' is there!). In the earlier shell simulation, e2e.sh was matching. That would throw off the expected count (total 5 matches: a.txt x3, b.txt x1, d x1, e2e.sh x1 = 6). Let me clean up the fixture: delete e2e.sh from /tmp/greptest, and recreate the fixture cleanly. Also, the traversal order I observed earlier was: c.txt, sub/b.txt, d with space.txt, a.txt (readdir order). With max=4: sub/b.txt takes 1 (budget 3), d takes 1 (budget 2), a.txt takes min(3,2)=2 (budget 0). So the expected matches: b.txt:1, d:1, a.txt:1, a.txt:3 → 4 matches. The first match is in sub/b.txt, the second is in d with space.txt → different files → in the context test (max=2), `--` is expected between them. ✓ Let me recreate the fixture cleanly and run the e2e test.

Now clean the fixture (remove my `e2e.sh` which contains "foo") and run the end-to-end tests:

Tool 🔧 bash {"command":"cd /tmp/greptest && rm -f e2e.sh && ls -la && cd /project && go test ./internal/tools/ -run 'TestE2E' -v 2>&1 | grep -vE '^\\s*$' | head -60"}

Arguments

{"command":"cd /tmp/greptest && rm -f e2e.sh && ls -la && cd /project && go test ./internal/tools/ -run 'TestE2E' -v 2>&1 | grep -vE '^\\s*$' | head -60"}

Result

total 24
drwxr-xr-x 3 user user 4096 Aug 26 12:11 .
drwxrwxrwt 1 root root 4096 Aug 26 12:10 ..
-rw-r--r-- 1 user user   16 Aug 26 12:03 a.txt
-rw-r--r-- 1 user user   14 Aug 26 12:03 c.txt
-rw-r--r-- 1 user user    8 Aug 26 12:03 d with space.txt
drwxr-xr-x 2 user user 4096 Aug 26 12:03 sub
# github.com/abrander/zoo/internal/tools [github.com/abrander/zoo/internal/tools.test]
internal/tools/grep_search_e2e_temp_test.go:31:25: cannot use fc (variable of struct type localContext) as Context value in argument to grepSearch: localContext does not implement Context (missing method Forgejo)
internal/tools/grep_search_e2e_temp_test.go:47:25: cannot use fc (variable of struct type localContext) as Context value in argument to grepSearch: localContext does not implement Context (missing method Forgejo)
internal/tools/grep_search_e2e_temp_test.go:67:25: cannot use fc (variable of struct type localContext) as Context value in argument to grepSearch: localContext does not implement Context (missing method Forgejo)
internal/tools/grep_search_e2e_temp_test.go:84:25: cannot use fc (variable of struct type localContext) as Context value in argument to grepSearch: localContext does not implement Context (missing method Forgejo)
internal/tools/grep_search_e2e_temp_test.go:96:26: cannot use fc (variable of struct type localContext) as Context value in argument to grepSearch: localContext does not implement Context (missing method Forgejo)
FAIL	github.com/abrander/zoo/internal/tools [build failed]
FAIL

Thinking

I need to add a `Forgejo()` method to localContext. Let me fix that.

Tool 🔧 edit_file {"find":"func (localContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tcmd := exec.CommandContext(ctx, \"sh\", \"-c\", command)\n\tvar out, errb strings.Builder\n\tcmd.Stdout = &out\n\tcmd.Stderr = &errb\n\terr := cmd.Run()\n\treturn out.String(), errb.String(), err\n}","path":"/project/internal/tools/grep_search_e2e_temp_test.go","replace":"func (localContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tcmd := exec.CommandContext(ctx, \"sh\", \"-c\", command)\n\tvar out, errb strings.Builder\n\tcmd.Stdout = &out\n\tcmd.Stderr = &errb\n\terr := cmd.Run()\n\treturn out.String(), errb.String(), err\n}\n\nfunc (localContext) Forgejo() ForgejoActions { return nil }"}

Arguments

{"find":"func (localContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tcmd := exec.CommandContext(ctx, \"sh\", \"-c\", command)\n\tvar out, errb strings.Builder\n\tcmd.Stdout = &out\n\tcmd.Stderr = &errb\n\terr := cmd.Run()\n\treturn out.String(), errb.String(), err\n}","path":"/project/internal/tools/grep_search_e2e_temp_test.go","replace":"func (localContext) Exec(ctx context.Context, command string) (string, string, error) {\n\tcmd := exec.CommandContext(ctx, \"sh\", \"-c\", command)\n\tvar out, errb strings.Builder\n\tcmd.Stdout = &out\n\tcmd.Stderr = &errb\n\terr := cmd.Run()\n\treturn out.String(), errb.String(), err\n}\n\nfunc (localContext) Forgejo() ForgejoActions { return nil }"}

Result

1 occurrences replaced

Thinking

Wait a sec, `ForgejoActions` is an interface, so returning nil should be fine. Let me try running it one more time.

Tool 🔧 bash {"command":"cd /project && go test ./internal/tools/ -run 'TestE2E' -v 2>&1 | head -60"}

Arguments

{"command":"cd /project && go test ./internal/tools/ -run 'TestE2E' -v 2>&1 | head -60"}

Result

=== RUN   TestE2EGlobalCapAcrossFiles
    grep_search_e2e_temp_test.go:43: output:
        /tmp/greptest/sub/b.txt:1:foo
        /tmp/greptest/d with space.txt:1:foo foo
        /tmp/greptest/a.txt:1:foo
        /tmp/greptest/a.txt:3:foo
--- PASS: TestE2EGlobalCapAcrossFiles (0.01s)
=== RUN   TestE2EGlobalCapWithContext
    grep_search_e2e_temp_test.go:61: output:
        /tmp/greptest/sub/b.txt:1:foo
        --
        /tmp/greptest/d with space.txt:1:foo foo
--- PASS: TestE2EGlobalCapWithContext (0.00s)
=== RUN   TestE2EUnderCapMatchesSingleGrep
--- PASS: TestE2EUnderCapMatchesSingleGrep (0.01s)
=== RUN   TestE2ENoMatches
--- PASS: TestE2ENoMatches (0.00s)
=== RUN   TestE2EBadRegex
--- PASS: TestE2EBadRegex (0.00s)
PASS
ok  	github.com/abrander/zoo/internal/tools	0.028s

Thinking

All end-to-end tests pass against the actual grep: 1. **TestE2EGlobalCapAcrossFiles**: `max_results=4` spanning 3 files with 5 total matches → exactly 4 match lines, in traversal order, no `--` (no context). ✓ 2. **TestE2EGlobalCapWithContext**: `max_results=2, -A 1` → exactly 2 matches, with `--` between files. ✓ (Note: in this output, the context line for b.txt's match is… wait, b.txt's match is line 1, and -A 1 should show line 2, but b.txt only has 1 line so there's no context. Correct.) 3. **TestE2EUnderCapMatchesSingleGrep**: When the cap is not reached, the output is **byte-for-byte identical** to a single `grep -Rn -I -H -E -i -A 1` run. ✓ — This is a strong guarantee that the format is preserved. 4. No matches → "No matches found." ✓ 5. Invalid regex → error. ✓ One more scenario worth verifying: the case where a single file has more matches than the budget (the cap is applied within a file via -m). And the case where the budget is exactly exhausted at a file boundary. Let me quickly add a check… actually, TestGrepSearchDefaultMaxResults covers -m 100 for a file with 150 matches at the unit level. And the "budget exactly exhausted" case: max=2 in the context test — budget: b.txt takes 1 (budget 1), d takes 1 (budget 0), stop. a.txt is not visited. This is already covered. Let me also verify the case where a single file has more matches than the budget, with context — e.g., a.txt (3 matches) with max=2, -A 1: expected output is a.txt:1:foo, a.txt-2-bar, a.txt:3:foo (merged block: matches on lines 1 and 3, line 2 as context in between… wait, -A 1: match on line 1 → context line 2; match on line 3 → context line 4. Blocks: [1, 2] and [3, 4] — separated by more than 1 line? Match on line 1, context up to line 2; next match on line 3 — line 3 is within line 1's -A 1 range (line 2), so… gap: line 2 (context) then line 3 (match) — adjacent, so merged into one block: `1:foo, 2-bar, 3:foo, 4-foo`? Hmm wait, a.txt = foo(1), bar(2), foo(3), foo(4). -A 1: match on line 1 → +line 2; match on line 3 → +line 4; match on line 4 → +line 5 (doesn't exist). Blocks: [1..2] and [3..4] — is there a gap between line 2 and line 3? No, they're adjacent → merged into a single block: 1:foo, 2-bar, 3:foo, 4:foo. So -m 2 returns the first 2 matches (lines 1 and 3) with context: the merged block `1:foo, 2-bar, 3:foo, 4:foo`. Let me quickly verify that grep -m 2 -A 1 returns that. Actually, this is just standard grep behavior, and my code passes it through as-is. The unit tests cover the budget calculation. I think the verification is sufficient. So, delete the temporary e2e test file, run the full test suite once more, and commit. Wait — before finalizing, let me reconsider one more design detail: in pass 2, I'm not passing `--include`. If the glob is a filter, the file list already reflects it. ✓ And one more check — the `TestToolSchemas` test verifies the JSON schema of all tools; my description change is fine. Also, let me double-check that `go vet` passes and review the final diff.

All end-to-end tests passed against actual grep — including the important `TestE2EUnderCapMatchesSingleGrep`, which proves that when the cap isn't reached, the output is **byte-for-byte identical** to a single grep run. Let me verify one more edge case (when a single file exceeds the budget with context), then clean up the temporary files:

Tool 🔧 bash {"command":"cd /tmp/greptest && echo \"--- grep -m 2 -A 1 on a.txt (3 matches, budget 2):\" && grep -I -H -E -i -n -A 1 -m 2 -e foo a.txt"}

Arguments

{"command":"cd /tmp/greptest && echo \"--- grep -m 2 -A 1 on a.txt (3 matches, budget 2):\" && grep -I -H -E -i -n -A 1 -m 2 -e foo a.txt"}

Result

--- grep -m 2 -A 1 on a.txt (3 matches, budget 2):
a.txt:1:foo
a.txt-2-bar
a.txt:3:foo
a.txt-4-foo

Thinking

`-m 2` returns exactly 2 matches (lines 1 and 3) with full context, and the 4th match (line 4) is excluded. This is the correct behavior — the per-file `-m` caps the number of matches, and the budget caps the total. Next, I'll delete the temporary e2e test file and run the full test suite.

`-m 2` returns exactly 2 matches with full context. Now remove the temporary e2e file and run the complete suite:

Tool 🔧 remove_file {"path":"/project/internal/tools/grep_search_e2e_temp_test.go"}

Arguments

{"path":"/project/internal/tools/grep_search_e2e_temp_test.go"}

Result

File removed successfully

Thinking

Let's also clean up the test directory in /tmp and run the full test suite once more.

Tool 🔧 bash {"command":"cd /project && rm -rf /tmp/greptest && go build ./... && go vet ./... && go test ./... 2>&1 | grep -vE 'no test files|downloading' "}

Arguments

{"command":"cd /project && rm -rf /tmp/greptest && go build ./... && go vet ./... && go test ./... 2>&1 | grep -vE 'no test files|downloading' "}

Result

ok  	github.com/abrander/zoo/internal/agentrun	(cached)
ok  	github.com/abrander/zoo/internal/config	(cached)
ok  	github.com/abrander/zoo/internal/forgejo	(cached)
ok  	github.com/abrander/zoo/internal/livelog	(cached)
ok  	github.com/abrander/zoo/internal/llm	(cached)
ok  	github.com/abrander/zoo/internal/scheduler	(cached)
ok  	github.com/abrander/zoo/internal/store	(cached)
ok  	github.com/abrander/zoo/internal/tools	(cached)
ok  	github.com/abrander/zoo/internal/web	(cached)

Thinking

All passed. Let me check the final diff to make sure everything is clean and surgical.

All green. Let me review the final diff before committing:

Tool 🔧 bash {"command":"cd /project && git diff --stat && git diff"}

Arguments

{"command":"cd /project && git diff --stat && git diff"}

Result

 internal/tools/grep_search.go | 165 +++++++++++++++++++++++++++---------
 internal/tools/tools_test.go  | 192 +++++++++++++++++++++++++++++++++++-------
 2 files changed, 288 insertions(+), 69 deletions(-)
diff --git a/internal/tools/grep_search.go b/internal/tools/grep_search.go
index 2de9455..632eddb 100644
--- a/internal/tools/grep_search.go
+++ b/internal/tools/grep_search.go
@@ -28,11 +28,20 @@ func init() {
 	tool.AddBooleanProperty("case_sensitive", "Whether the search should be case sensitive (default: false)", false)
 	tool.AddIntegerProperty("context_before", "Number of lines of context to show before each match (default: 0)", false)
 	tool.AddIntegerProperty("context_after", "Number of lines of context to show after each match (default: 0)", false)
-	tool.AddIntegerProperty("max_results", "Maximum number of matching lines to return per file (default: 100)", false)
+	tool.AddIntegerProperty("max_results", "Maximum number of matching lines to return in total, across all files (default: 100)", false)
 
 	Register(tool, grepSearch)
 }
 
+// grepSearch searches for a pattern and returns at most max_results
+// matching lines in total.
+//
+// grep can only cap matches per file (--max-count), which is not what
+// max_results promises, so the search runs in two passes: first count
+// the matching lines in each file, then extract them file by file,
+// spending a global budget of max_results matches. Files are visited
+// in the order grep's recursive traversal reported them, so the
+// results come out in the same order a single grep run would produce.
 func grepSearch(ctx Context, params grepSearchParams) (string, error) {
 	maxResults := params.MaxResults
 	if maxResults == 0 {
@@ -44,65 +53,141 @@ func grepSearch(ctx Context, params grepSearchParams) (string, error) {
 	// promises: |, +, ?, (), {} all work as metacharacters. Without
 	// it, grep falls back to BRE, where those are treated literally.
 	// -H keeps the filename in the output even when the search target
-	// is a single file, so results look the same as directory searches.
-	args := []string{"grep", "-Rn", "-I", "-H", "-E"}
+	// is a single file, so results look the same as directory
+	// searches. -I skips binary files.
+	base := []string{"grep", "-I", "-H", "-E"}
 	if !params.CaseSensitive {
-		args = append(args, "-i")
+		base = append(base, "-i")
 	}
 
-	if params.ContextBefore > 0 {
-		args = append(args, "-B", strconv.Itoa(params.ContextBefore))
-	}
-
-	if params.ContextAfter > 0 {
-		args = append(args, "-A", strconv.Itoa(params.ContextAfter))
-	}
-
-	// --max-count caps the number of matching lines, which is what
-	// max_results promises. A `head -n` pipe would instead cap raw
-	// output lines, and with -A/-B context a single match spans
-	// several lines, so matches would be silently dropped. Note the
-	// cap is per file: that is how grep counts.
-	args = append(args, "--max-count="+strconv.Itoa(maxResults))
-
 	// By default the search target is the whole project. grep's
 	// --include matches basenames against a glob, so a literal file
 	// path (no wildcards) passed as the glob would never match;
 	// treat such values as a path and search that file directly.
+	globFilter := params.Glob != "" && isGlobPattern(params.Glob)
 	target := "/project"
-	if params.Glob != "" {
-		if isGlobPattern(params.Glob) {
-			args = append(args, "--include="+shellQuote(params.Glob))
-		} else {
-			target = resolvePath(params.Glob)
-		}
+	if params.Glob != "" && !globFilter {
+		target = resolvePath(params.Glob)
 	}
 
-	args = append(args, "-e", shellQuote(params.Pattern), shellQuote(target))
+	// Pass one: count the matching lines in each file. grep -c prints
+	// "path:count" per file (a ":0" line for files without matches),
+	// which is unambiguous to parse: the count is the final field, so
+	// even paths containing colons come out right.
+	countArgs := append(append([]string{}, base...), "-R", "-c")
+	if globFilter {
+		countArgs = append(countArgs, "--include="+shellQuote(params.Glob))
+	}
+	countArgs = append(countArgs, "-e", shellQuote(params.Pattern), shellQuote(target))
 
-	output, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " "))
+	counts, err := grepFileCounts(ctx, countArgs)
 	if err != nil {
-		// grep exits non-zero (with empty output) when there are no
-		// matches; that's a normal result, not a tool failure.
-		if strings.TrimSpace(output) == "" && strings.TrimSpace(stderr) == "" {
-			return "No matches found.", nil
+		return "", err
+	}
+	if len(counts) == 0 {
+		return "No matches found.", nil
+	}
+
+	// Pass two: extract the matches, file by file, until the budget
+	// of max_results matching lines is spent.
+	hasContext := params.ContextBefore > 0 || params.ContextAfter > 0
+	var (
+		budget = maxResults
+		out    strings.Builder
+	)
+	for _, fc := range counts {
+		if budget <= 0 {
+			break
 		}
 
-		return "", fmt.Errorf("grep_search: %w", execErr(err, output, stderr))
-	}
+		n := fc.count
+		if n > budget {
+			n = budget
+		}
 
-	if strings.TrimSpace(output) == "" {
-		// Defensive: grep exits 0 only after printing at least one
-		// match, so an empty result here is unexpected; surface any
-		// diagnostic rather than pretending the search succeeded.
-		if msg := strings.TrimSpace(stderr); msg != "" {
-			return "", fmt.Errorf("grep_search: %s", msg)
+		args := append(append([]string{}, base...), "-n")
+		if params.ContextBefore > 0 {
+			args = append(args, "-B", strconv.Itoa(params.ContextBefore))
+		}
+		if params.ContextAfter > 0 {
+			args = append(args, "-A", strconv.Itoa(params.ContextAfter))
+		}
+		args = append(args, "-m", strconv.Itoa(n), "-e", shellQuote(params.Pattern), shellQuote(fc.path))
+
+		fileOut, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " "))
+		if err != nil {
+			// Pass one just counted matches in this file, so it
+			// should still match; an empty result with no diagnostic
+			// means the file changed in the meantime and is skipped.
+			// Anything else (e.g. the file vanished) is a real error.
+			if strings.TrimSpace(fileOut) == "" && strings.TrimSpace(stderr) == "" {
+				continue
+			}
+			return "", fmt.Errorf("grep_search: %w", execErr(err, fileOut, stderr))
 		}
 
+		if fileOut == "" {
+			continue
+		}
+		if out.Len() > 0 && hasContext {
+			// grep separates the output of different files with a
+			// "--" line when context lines are in play.
+			out.WriteString("--\n")
+		}
+		out.WriteString(fileOut)
+		budget -= n
+	}
+
+	if out.Len() == 0 {
+		// Every file changed between the passes; nothing to show.
 		return "No matches found.", nil
 	}
 
-	return output, nil
+	return out.String(), nil
+}
+
+// fileCount is the number of matching lines in one file, as reported
+// by the counting pass.
+type fileCount struct {
+	path  string
+	count int
+}
+
+// grepFileCounts runs the counting pass and returns the files with at
+// least one match, in traversal order.
+func grepFileCounts(ctx Context, args []string) ([]fileCount, error) {
+	output, stderr, err := ctx.Exec(context.Background(), strings.Join(args, " "))
+	if err != nil && strings.TrimSpace(stderr) != "" {
+		// A diagnostic on stderr means grep itself failed (e.g. a
+		// bad regex). Exit 1 with clean stderr just means nothing
+		// matched; the ":0" counts below say the same.
+		return nil, fmt.Errorf("grep_search: %w", execErr(err, output, stderr))
+	}
+
+	var counts []fileCount
+	for _, line := range strings.Split(output, "\n") {
+		if fc, ok := parseCountLine(line); ok {
+			counts = append(counts, fc)
+		}
+	}
+	return counts, nil
+}
+
+// parseCountLine parses one "path:count" line from grep -c output.
+// The count is the last colon-separated field, so paths containing
+// colons still parse; lines without a positive numeric count
+// (including the ":0" lines grep -c prints for non-matching files)
+// are rejected.
+func parseCountLine(line string) (fileCount, bool) {
+	i := strings.LastIndex(line, ":")
+	if i < 0 {
+		return fileCount{}, false
+	}
+	n, err := strconv.Atoi(line[i+1:])
+	if err != nil || n <= 0 {
+		return fileCount{}, false
+	}
+	return fileCount{path: line[:i], count: n}, true
 }
 
 // isGlobPattern reports whether s contains the glob metacharacters
diff --git a/internal/tools/tools_test.go b/internal/tools/tools_test.go
index babde4c..9ea3ce9 100644
--- a/internal/tools/tools_test.go
+++ b/internal/tools/tools_test.go
@@ -33,16 +33,37 @@ func (f *fakeForgejoActions) SubmitReview(state, body string) error {
 	return nil
 }
 
+// execResponse is one canned answer to an Exec call.
+type execResponse struct {
+	stdout string
+	stderr string
+	err    error
+}
+
 type fakeContext struct {
 	lastCmd string
-	stdout  string
-	stderr  string
-	err     error
-	fg      *fakeForgejoActions
+	cmds    []string
+	// responses, when set, are returned one per Exec call in order
+	// (the last one repeats once exhausted); otherwise the single
+	// stdout/stderr/err fields answer every call.
+	responses []execResponse
+	stdout    string
+	stderr    string
+	err       error
+	fg        *fakeForgejoActions
 }
 
 func (f *fakeContext) Exec(ctx context.Context, command string) (string, string, error) {
 	f.lastCmd = command
+	f.cmds = append(f.cmds, command)
+	if len(f.responses) > 0 {
+		i := len(f.cmds) - 1
+		if i >= len(f.responses) {
+			i = len(f.responses) - 1
+		}
+		r := f.responses[i]
+		return r.stdout, r.stderr, r.err
+	}
 	return f.stdout, f.stderr, f.err
 }
 
@@ -141,14 +162,20 @@ func TestSubmitReviewRequiresBodyUnlessApproved(t *testing.T) {
 }
 
 func TestGrepSearchUsesExtendedRegex(t *testing.T) {
-	fc := &fakeContext{stdout: "/project/foo.go:1:foo|bar\n"}
+	fc := &fakeContext{responses: []execResponse{
+		{stdout: "/project/foo.go:1\n"},
+		{stdout: "/project/foo.go:1:foo|bar\n"},
+	}}
 
 	out, err := grepSearch(fc, grepSearchParams{Pattern: `foo|bar`})
 	if err != nil {
 		t.Fatal(err)
 	}
-	if !strings.Contains(fc.lastCmd, "grep -Rn -I -H -E") {
-		t.Fatalf("expected grep to be invoked with -E (extended regex), got %q", fc.lastCmd)
+	if !strings.Contains(fc.cmds[0], "grep -I -H -E") {
+		t.Fatalf("expected grep to be invoked with -E (extended regex), got %q", fc.cmds[0])
+	}
+	if !strings.Contains(fc.cmds[0], "-c") {
+		t.Fatalf("expected the counting pass to use grep -c, got %q", fc.cmds[0])
 	}
 	if !strings.Contains(out, "foo|bar") {
 		t.Fatalf("unexpected result: %s", out)
@@ -159,7 +186,10 @@ func TestGrepSearchUsesExtendedRegex(t *testing.T) {
 // searched directly, not passed to --include, which globs basenames
 // and would never match a full path.
 func TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {
-	fc := &fakeContext{stdout: "/project/internal/store/store.go:1:func (s *Store) Get() {}\n"}
+	fc := &fakeContext{responses: []execResponse{
+		{stdout: "/project/internal/store/store.go:1\n"},
+		{stdout: "/project/internal/store/store.go:1:func (s *Store) Get() {}\n"},
+	}}
 
 	out, err := grepSearch(fc, grepSearchParams{
 		Pattern:      `^func \(s \*Store\)`,
@@ -173,6 +203,9 @@ func TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {
 	if strings.Contains(fc.lastCmd, "--include") {
 		t.Fatalf("literal path must not be passed to --include, got %q", fc.lastCmd)
 	}
+	if !strings.HasSuffix(fc.cmds[0], shellQuote("/project/internal/store/store.go")) {
+		t.Fatalf("expected the counting pass to target the literal path, got %q", fc.cmds[0])
+	}
 	if !strings.HasSuffix(fc.lastCmd, shellQuote("/project/internal/store/store.go")) {
 		t.Fatalf("expected grep to target the literal path, got %q", fc.lastCmd)
 	}
@@ -187,49 +220,150 @@ func TestGrepSearchLiteralPathSearchesFileDirectly(t *testing.T) {
 // A glob with wildcards must still be passed to --include and the
 // search must target the whole project.
 func TestGrepSearchGlobStillUsesInclude(t *testing.T) {
-	fc := &fakeContext{stdout: "/project/foo.go:1:foo\n"}
+	fc := &fakeContext{responses: []execResponse{
+		{stdout: "/project/foo.go:1\n"},
+		{stdout: "/project/foo.go:1:foo\n"},
+	}}
 
 	if _, err := grepSearch(fc, grepSearchParams{Pattern: "foo", Glob: "*.go"}); err != nil {
 		t.Fatal(err)
 	}
 
-	if !strings.Contains(fc.lastCmd, "--include='*.go'") {
-		t.Fatalf("expected glob to be passed to --include, got %q", fc.lastCmd)
+	if !strings.Contains(fc.cmds[0], "--include='*.go'") {
+		t.Fatalf("expected glob to be passed to --include, got %q", fc.cmds[0])
 	}
-	if !strings.HasSuffix(fc.lastCmd, shellQuote("/project")) {
-		t.Fatalf("expected glob search to target /project, got %q", fc.lastCmd)
+	if !strings.HasSuffix(fc.cmds[0], shellQuote("/project")) {
+		t.Fatalf("expected glob search to target /project, got %q", fc.cmds[0])
 	}
 }
 
-// max_results must cap the number of matching lines via grep's
-// --max-count, not the number of raw output lines via a head pipe:
-// with context lines, a single match spans several lines, so head
-// would silently drop matches.
-func TestGrepSearchLimitsMatchesNotLines(t *testing.T) {
-	fc := &fakeContext{stdout: "/project/foo.go:1:foo\n"}
-
-	if _, err := grepSearch(fc, grepSearchParams{Pattern: "foo", MaxResults: 5, ContextAfter: 2}); err != nil {
+// max_results is a global cap on matching lines, not a per-file one:
+// with matches in several files, the extraction pass spends the
+// budget file by file and stops once it is exhausted.
+func TestGrepSearchMaxResultsIsGlobal(t *testing.T) {
+	fc := &fakeContext{responses: []execResponse{
+		{stdout: "/project/a.go:3\n/project/b.go:3\n"},
+		{stdout: "/project/a.go:1:x\n/project/a.go:2:x\n/project/a.go:3:x\n"},
+		{stdout: "/project/b.go:1:x\n"},
+	}}
+
+	out, err := grepSearch(fc, grepSearchParams{Pattern: "x", MaxResults: 4})
+	if err != nil {
 		t.Fatal(err)
 	}
 
-	if !strings.Contains(fc.lastCmd, "--max-count=5") {
-		t.Fatalf("expected max_results to be passed to grep as --max-count, got %q", fc.lastCmd)
+	if len(fc.cmds) != 3 {
+		t.Fatalf("expected one counting pass plus two extraction passes, got %d commands: %v", len(fc.cmds), fc.cmds)
+	}
+	if !strings.Contains(fc.cmds[1], "-m 3") || !strings.HasSuffix(fc.cmds[1], shellQuote("/project/a.go")) {
+		t.Fatalf("expected the first file to take all 3 of its matches, got %q", fc.cmds[1])
+	}
+	if !strings.Contains(fc.cmds[2], "-m 1") || !strings.HasSuffix(fc.cmds[2], shellQuote("/project/b.go")) {
+		t.Fatalf("expected the second file to take only the remaining 1 match, got %q", fc.cmds[2])
+	}
+	for _, cmd := range fc.cmds {
+		if strings.Contains(cmd, "head") {
+			t.Fatalf("expected no head pipe in the commands, got %q", cmd)
+		}
 	}
-	if strings.Contains(fc.lastCmd, "head") {
-		t.Fatalf("expected no head pipe in the command, got %q", fc.lastCmd)
+
+	want := "/project/a.go:1:x\n/project/a.go:2:x\n/project/a.go:3:x\n/project/b.go:1:x\n"
+	if out != want {
+		t.Fatalf("unexpected result: %q", out)
 	}
 }
 
-// An omitted max_results (zero) falls back to the default of 100.
+// An omitted max_results (zero) falls back to the default budget of
+// 100 matching lines.
 func TestGrepSearchDefaultMaxResults(t *testing.T) {
-	fc := &fakeContext{stdout: "/project/foo.go:1:foo\n"}
+	fc := &fakeContext{responses: []execResponse{
+		{stdout: "/project/foo.go:150\n"},
+		{stdout: "/project/foo.go:1:foo\n"},
+	}}
 
 	if _, err := grepSearch(fc, grepSearchParams{Pattern: "foo"}); err != nil {
 		t.Fatal(err)
 	}
 
-	if !strings.Contains(fc.lastCmd, "--max-count=100") {
-		t.Fatalf("expected the default --max-count=100, got %q", fc.lastCmd)
+	if !strings.Contains(fc.lastCmd, "-m 100") {
+		t.Fatalf("expected the default budget of 100 to cap the extraction, got %q", fc.lastCmd)
+	}
+}
+
+// With context lines, grep separates the output of different files
+// with a "--" line; the per-file extraction must reproduce that.
+func TestGrepSearchContextSeparatesFiles(t *testing.T) {
+	fc := &fakeContext{responses: []execResponse{
+		{stdout: "/project/a.go:1\n/project/b.go:1\n"},
+		{stdout: "/project/a.go:1:x\n/project/a.go-2:y\n"},
+		{stdout: "/project/b.go:1:x\n/project/b.go-2:y\n"},
+	}}
+
+	out, err := grepSearch(fc, grepSearchParams{Pattern: "x", ContextAfter: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	want := "/project/a.go:1:x\n/project/a.go-2:y\n--\n/project/b.go:1:x\n/project/b.go-2:y\n"
+	if out != want {
+		t.Fatalf("unexpected result: %q", out)
+	}
+}
+
+func TestParseCountLine(t *testing.T) {
+	cases := []struct {
+		line string
+		path string
+		n    int
+		ok   bool
+	}{
+		{"/project/foo.go:3", "/project/foo.go", 3, true},
+		{"/project/foo bar.go:1", "/project/foo bar.go", 1, true},
+		{"/project/we:ird.go:2", "/project/we:ird.go", 2, true},
+		{"/project/foo.go:0", "", 0, false},
+		{"", "", 0, false},
+		{"/project/foo.go", "", 0, false},
+	}
+	for _, tc := range cases {
+		fc, ok := parseCountLine(tc.line)
+		if ok != tc.ok || (ok && (fc.path != tc.path || fc.count != tc.n)) {
+			t.Errorf("parseCountLine(%q) = (%q, %d, %v), want (%q, %d, %v)",
+				tc.line, fc.path, fc.count, ok, tc.path, tc.n, tc.ok)
+		}
+	}
+}
+
+// grep -c prints a ":0" line for every non-matching file even when it
+// exits 1; those must not be mistaken for matches, and no extraction
+// pass may run.
+func TestGrepSearchNoMatchesZeroCounts(t *testing.T) {
+	fc := &fakeContext{
+		stdout: "/project/a.go:0\n/project/b.go:0\n",
+		err:    fmt.Errorf("exit status 1"),
+	}
+
+	out, err := grepSearch(fc, grepSearchParams{Pattern: "nomatch"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if out != "No matches found." {
+		t.Fatalf("unexpected result: %q", out)
+	}
+	if len(fc.cmds) != 1 {
+		t.Fatalf("expected only the counting pass to run, got %d commands", len(fc.cmds))
+	}
+}
+
+// A grep failure with a diagnostic (e.g. a bad regex) must surface as
+// an error, not be swallowed as "no matches".
+func TestGrepSearchBadRegexErrors(t *testing.T) {
+	fc := &fakeContext{
+		stderr: "grep: Unmatched ( or (\n",
+		err:    fmt.Errorf("exit status 2"),
+	}
+
+	if _, err := grepSearch(fc, grepSearchParams{Pattern: "foo("}); err == nil {
+		t.Fatal("expected an error for a bad regex")
 	}
 }

Thinking

The diff looks clean. One point to double-check: in `TestGrepSearchUsesExtendedRegex`, the assertion `strings.Contains(fc.cmds[0], "-c")` — the pass-1 command is `grep -I -H -E -i -R -c -e 'foo|bar' '/project'`. It contains "-c" ✓. But wait — could "-c" appear as a substring of something else? Not a problem here. Also, a subtle point about the `TestGrepSearchMaxResultsIsGlobal` test: the response for b.go is only 1 line (`/project/b.go:1:x\n`) — this simulates what grep -m 1 would actually return. Good, and the expected output matches. One more check on the diff: the old `TestGrepSearchNoMatches` test (fc with only err set, no stdout) — in the new code: pass 1 → err=exit 1, stderr="" → not an error → parse empty output → no count → "No matches found." ✓ (already ran, passes). Now, one more thing I want to reconsider: the `hasContext` variable and the `--` separator. Let me think again about whether a single grep -R without context really doesn't emit `--` between files… I verified this earlier: no context → no `--`; with -A 1 → `--` between files. ✓ But wait — one more subtle case: what if context is enabled (hasContext=true) but a file has only one match block? In that case there's no `--` inside that file's output, and the inter-file `--` is added by my join. ✓ Matches single-grep behavior (verified with the "two separate files, -A 1" test earlier: `--` between the files). Edge case: what if the first file's output is empty (race) and the second file's output is non-empty? `out.Len() == 0` → no leading `--`. ✓ Now, one more thing I want to reconsider: the error path for pass 2. If the file has disappeared: grep exits 2, stderr "No such file or directory" → hard error. Hmm — is a hard error the right call, or should we skip? The previous single-grep behavior: if a file disappears during a single grep -R run, grep reports an error to stderr and exits 2 → the old code returned an error. So hard error = consistent with previous behavior. OK. But, hmm, wait: there's actually a subtle asymmetry. In the old single-pass code, an unreadable file (permission denied) → grep exit 2 → error. Same now. Consistent. One more consideration — the "skip if empty" branch in pass 2: `if strings.TrimSpace(fileOut) == "" && strings.TrimSpace(stderr) == ""`. When could a per-file grep return empty output with no stderr and a non-zero exit? When the file no longer has any matches (exit 1). That's the race case. ✓ Alright. One more thing to double-check: `go vet` passes, and the full test suite passes too. Now, let me think about whether the PR title/body needs updating. The PR title is "grep_search: cap matches with --max-count instead of head -n" — still accurate (we still use --max-count/-m, now per-file within the budget). The body's "Note" section is now stale (it says the per-file behavior is what we ship, and a global cap would need post-processing). I can't edit the PR body with the available tools (there's no update_pr tool). I'll explain in my reply comment. Actually, wait — should I add a commit that updates the PR description? No, the PR body is on Forgejo, not in the repo. I'll cover it in a comment. Now, commit and push. Commit message style from the repo history: "grep_search: cap matches with --max-count instead of head -n" — imperative, prefixed with the tool name. My commit: "grep_search: make max_results a global cap across files". Then: 1. Push to issue-68-greg. 2. Reply to the review — use submit_review with state "comment" (per the tool description: "use it to react to a PR (e.g., after addressing earlier feedback)"). 3. Also post a `comment` summarizing what I did (per the general guideline "always leave a comment summarizing what you did"). Hmm, wait — let me reconsider the loop risk of submit_review. "Submitting a review fires a pr:review event that triggers a run." If my comment-state review triggers a new run for me (the PR assignee), that run will see a review by greg with state "comment". The instructions for that run will say "address the feedback" — the feedback is my own summary, and a sensible response is to confirm there's nothing to address. There's a risk of a loop, but the tool description explicitly endorses this flow ("use it to react to a PR (e.g., after addressing earlier feedback)"). The event instructions for this run explicitly say "reply to the review" — and submit_review is the tool that replies to a review (a comment is just a PR comment, not a reply to the review). Hmm, actually, let me think about this from a different angle. In Gitea/Forgejo, when a review is submitted on a PR, the PR's status changes. A review with state "comment" doesn't change the PR's status. The pr:review event fires on any review submission. The run that gets triggered is presumably for the agent assigned to the PR (greg, me). So, yes, I'll be triggered again. In that future run, I'll see: a review by greg (myself) with state "comment", no changes requested. The instructions say "address the feedback, push changes, reply to the review, and resolve inline comments." The feedback is my own summary of the fix. The correct action there is: verify there's nothing new to address, and reply briefly (probably just a comment, not another review, to avoid an infinite loop). To minimize the risk of a loop, in my reply I should make it clear that this is a final response to the feedback and that no further action is needed. And in the future run, if I see my own comment review with no actionable feedback, I should just leave a brief comment (not submit another review). Alternatively — I could skip submit_review and just use `comment`. But the event instructions explicitly say "reply to the review," and the submit_review tool's description explicitly says to use it after addressing earlier feedback. I'll use submit_review with state "comment." Hmm, one more consideration: should the state be "approved"? I'm the PR author; approving my own PR would be weird, and it might imply the review is complete. "comment" is correct. OK, let me commit and push.

The diff is clean and surgical. Let me commit and push:

Tool 🔧 bash {"command":"cd /project && git add internal/tools/grep_search.go internal/tools/tools_test.go && git commit -m \"grep_search: make max_results a global cap across files\n\ngrep's --max-count caps matches per file, which is not what the\nagent expects from max_results. Enforce the cap in Go instead: the\nsearch now runs in two passes.\n\n1. Counting pass: grep -R -c reports the matching lines per file\n (\\\"path:count\\\"; the count is the final field, so paths with\n colons still parse, and the \\\":0\\\" lines for non-matching files\n are dropped).\n2. Extraction pass: files are visited in traversal order and each is\n grepped with -m min(count, remaining budget), so the total number\n of matching lines across all files never exceeds max_results.\n\nPer-file outputs are concatenated in the exact format a single grep\nrun produces (including the \\\"--\\\" separators between files when\ncontext lines are in play), and files are visited in the same order\ngrep's -R traversal reports them.\n\nVerified end-to-end against real grep: with matches spread over\nseveral files, max_results now returns exactly that many matching\nlines in total, and when the cap is not reached the output is\nbyte-identical to a single grep run.\" && git push origin issue-68-greg"}

Arguments

{"command":"cd /project && git add internal/tools/grep_search.go internal/tools/tools_test.go && git commit -m \"grep_search: make max_results a global cap across files\n\ngrep's --max-count caps matches per file, which is not what the\nagent expects from max_results. Enforce the cap in Go instead: the\nsearch now runs in two passes.\n\n1. Counting pass: grep -R -c reports the matching lines per file\n   (\\\"path:count\\\"; the count is the final field, so paths with\n   colons still parse, and the \\\":0\\\" lines for non-matching files\n   are dropped).\n2. Extraction pass: files are visited in traversal order and each is\n   grepped with -m min(count, remaining budget), so the total number\n   of matching lines across all files never exceeds max_results.\n\nPer-file outputs are concatenated in the exact format a single grep\nrun produces (including the \\\"--\\\" separators between files when\ncontext lines are in play), and files are visited in the same order\ngrep's -R traversal reports them.\n\nVerified end-to-end against real grep: with matches spread over\nseveral files, max_results now returns exactly that many matching\nlines in total, and when the cap is not reached the output is\nbyte-identical to a single grep run.\" && git push origin issue-68-greg"}

Result

[issue-68-greg 6d39e64] grep_search: make max_results a global cap across files
 2 files changed, 288 insertions(+), 69 deletions(-)
To https://code.stdio.dk/abrander/zoo.git
   41444dd..6d39e64  issue-68-greg -> issue-68-greg

Thinking

Push complete. Next, I'll reply to the review. I'll use `submit_review` with state "comment" to reply to the review (per the tool description, this is the documented flow for reacting after addressing feedback). I'll also post a `comment` summarizing the work. Let me write the reply. Key points: - Agreed — per-file isn't what the agent expects. - Fixed: `max_results` is now a true global cap. - How: two-pass approach (count with `grep -c`, then per-file extraction with `-m min(count, budget)`). - The output format is preserved exactly (byte-identical to a single grep when the cap isn't hit, including the `--` separator). - Updated the tool description: "Maximum number of matching lines to return in total, across all files (default: 100)". - Tests: unit tests for budget allocation + end-to-end verification against actual grep. - Note: the "Note" section in the PR body is now stale — the global cap is implemented as post-processing in Go (the very approach that note suggested). I'll keep it concise.

Pushed. Now let me reply to the review and summarize the work:

Tool 🔧 submit_review {"body":"Agreed — per-file isn't what the agent expects, so I've made `max_results` a true **global** cap on matching lines.\n\nSince grep can only count per file, the search now runs in two passes (the \"post-processing in Go\" the PR note anticipated):\n\n1. **Counting pass** — `grep -R -c` reports matching lines per file (`path:count`; the count is the final field, so even paths containing colons parse, and the `:0` lines for non-matching files are dropped).\n2. **Extraction pass** — files are visited in traversal order, each grepped with `-m min(count, remaining budget)`, stopping once the budget of `max_results` matches is spent.\n\nDetails:\n\n- The tool description now reads \"Maximum number of matching lines to return **in total, across all files** (default: 100)\".\n- Output format is preserved exactly: per-file outputs are concatenated the way a single grep run would print them, including the `--` separators between files when context lines are in play.\n- Verified end-to-end against real grep: with matches spread over several files, `max_results` now returns exactly that many matching lines in total; when the cap isn't reached the output is **byte-identical** to a single `grep -Rn -I -H -E` run.\n- New unit tests cover the budget allocation across files (`TestGrepSearchMaxResultsIsGlobal`), the `--` separator with context, `:0` count handling, and bad-regex errors; the `fakeContext` test double now supports a queue of canned responses, one per `Exec` call.\n\nThe \"Note\" section in the PR description is now stale — the strict global cap is implemented. `go build`, `go vet`, and the full `go test ./...` suite pass.","state":"comment"}

Arguments

{"body":"Agreed — per-file isn't what the agent expects, so I've made `max_results` a true **global** cap on matching lines.\n\nSince grep can only count per file, the search now runs in two passes (the \"post-processing in Go\" the PR note anticipated):\n\n1. **Counting pass** — `grep -R -c` reports matching lines per file (`path:count`; the count is the final field, so even paths containing colons parse, and the `:0` lines for non-matching files are dropped).\n2. **Extraction pass** — files are visited in traversal order, each grepped with `-m min(count, remaining budget)`, stopping once the budget of `max_results` matches is spent.\n\nDetails:\n\n- The tool description now reads \"Maximum number of matching lines to return **in total, across all files** (default: 100)\".\n- Output format is preserved exactly: per-file outputs are concatenated the way a single grep run would print them, including the `--` separators between files when context lines are in play.\n- Verified end-to-end against real grep: with matches spread over several files, `max_results` now returns exactly that many matching lines in total; when the cap isn't reached the output is **byte-identical** to a single `grep -Rn -I -H -E` run.\n- New unit tests cover the budget allocation across files (`TestGrepSearchMaxResultsIsGlobal`), the `--` separator with context, `:0` count handling, and bad-regex errors; the `fakeContext` test double now supports a queue of canned responses, one per `Exec` call.\n\nThe \"Note\" section in the PR description is now stale — the strict global cap is implemented. `go build`, `go vet`, and the full `go test ./...` suite pass.","state":"comment"}

Result

Review submitted

Thinking

The review has been submitted. Next, per the general guideline ("always leave a comment summarizing what was done"), I'll also post a `comment` summarizing the work.

Tool 🔧 comment {"body":"Addressed the review feedback — `max_results` is now a global cap, not a per-file one.\n\n**Commit:** `6d39e64` — `grep_search: make max_results a global cap across files`\n\n**What changed** (`internal/tools/grep_search.go`):\n- The search runs in two passes: `grep -R -c` first counts matching lines per file, then each file is extracted with `-m min(count, remaining budget)` in traversal order until the global budget of `max_results` is spent. So a recursive search can no longer return N matches *per file*.\n- The `max_results` tool description now says \"in total, across all files\".\n- Output format is unchanged: per-file outputs are concatenated exactly as a single grep run would print them (including `--` separators between files when context is in play).\n\n**Verification:**\n- Unit tests: budget allocation across files, `--` separator with context, `:0` count lines, bad-regex errors, count-line parsing (paths with spaces/colons).\n- End-to-end against real grep (temporary harness, since the tool shells out): with 5 matches across 3 files and `max_results=4`, exactly 4 matching lines are returned; when the cap isn't reached the output is byte-identical to a single `grep -Rn -I -H -E` run.\n- `go build ./...`, `go vet ./...`, full `go test ./...` pass.\n\nNo inline comments to resolve — the feedback was in the review body, which is addressed above."}

Arguments

{"body":"Addressed the review feedback — `max_results` is now a global cap, not a per-file one.\n\n**Commit:** `6d39e64` — `grep_search: make max_results a global cap across files`\n\n**What changed** (`internal/tools/grep_search.go`):\n- The search runs in two passes: `grep -R -c` first counts matching lines per file, then each file is extracted with `-m min(count, remaining budget)` in traversal order until the global budget of `max_results` is spent. So a recursive search can no longer return N matches *per file*.\n- The `max_results` tool description now says \"in total, across all files\".\n- Output format is unchanged: per-file outputs are concatenated exactly as a single grep run would print them (including `--` separators between files when context is in play).\n\n**Verification:**\n- Unit tests: budget allocation across files, `--` separator with context, `:0` count lines, bad-regex errors, count-line parsing (paths with spaces/colons).\n- End-to-end against real grep (temporary harness, since the tool shells out): with 5 matches across 3 files and `max_results=4`, exactly 4 matching lines are returned; when the cap isn't reached the output is byte-identical to a single `grep -Rn -I -H -E` run.\n- `go build ./...`, `go vet ./...`, full `go test ./...` pass.\n\nNo inline comments to resolve — the feedback was in the review body, which is addressed above."}

Result

Comment posted

Thinking

Everything is done: 1. ✅ Addressed the feedback: `max_results` is now a global cap across all files (two-pass approach: count with `grep -c`, then extract per-file using `-m min(count, budget)`). 2. ✅ Pushed the changes to the PR branch (`issue-68-greg`, commit `6d39e64`). 3. ✅ Replied to the review (submitted a review with state "comment" and posted a summary comment). 4. ✅ No inline comments to resolve (the review had 0 inline comments — the feedback was in the review body). Verified: - `go build ./...` ✓ - `go vet ./...` ✓ - Full `go test ./...` ✓ - End-to-end verification against actual grep (global cap is accurate, format is byte-identical when the cap isn't hit, `--` separators are correct, no-match and invalid-regex cases are handled) ✓ Done. Let me write up the final summary.

Done. Summary of what I did in response to the review: **Feedback:** abrander confirmed that `--max-count` caps matches *per file*, which isn't what the agent expects from `max_results`, and asked to fix it. **Fix (commit `6d39e64`, pushed to `issue-68-greg`):** Since grep can only count per file, `grep_search` now enforces the cap in Go with a two-pass design: 1. **Counting pass** — `grep -R -c` reports matching lines per file (`path:count`, parsed unambiguously from the final field; `:0` lines for non-matching files dropped). 2. **Extraction pass** — files are visited in traversal order, each grepped with `-m min(count, remaining budget)` and context flags, stopping once the global budget of `max_results` matches is spent. Key properties: - `max_results` is now a **true global cap** — a recursive search can no longer return N matches per file. - Output format is preserved exactly: per-file outputs are concatenated the way a single grep run prints them, including `--` separators between files when context is in play. - Tool description updated: "Maximum number of matching lines to return in total, across all files (default: 100)". **Verification:** - Unit tests for budget allocation across files, `--` separators with context, `:0` count handling, bad-regex errors, and count-line parsing (paths with spaces/colons); the `fakeContext` double now supports a queue of canned responses per `Exec` call. - End-to-end against real grep via a temporary harness: 5 matches across 3 files with `max_results=4` → exactly 4 matching lines; when the cap isn't reached, output is **byte-identical** to a single `grep -Rn -I -H -E` run; no-match and bad-regex paths behave as before. - `go build ./...`, `go vet ./...`, and the full `go test ./...` suite pass. **Reply:** Submitted a review reply (state: comment) explaining the fix, and posted a summary comment on the PR. There were no inline comments to resolve — the feedback lived in the review body, which is addressed.

Job c131ea83-384c-4176-be38-b124f7579d8a

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