Job 8f107841-0ce9-4ca1-a620-ca0593653b2e
Details and log output for this agent run.
Agent
greg
greg
Log
Thinking
First, let's start by exploring the project to find the grep tool that was mentioned in the issue.
Tool 🔧 list_files {"path": ".", "recursive": true}
Arguments
{"path": ".", "recursive": true}
Result
/project/cmd /project/cmd/zoo /project/cmd/zoo/main.go /project/go.mod /project/go.sum /project/internal /project/internal/agentrun /project/internal/agentrun/clone.go /project/internal/agentrun/context.go /project/internal/agentrun/docker.go /project/internal/agentrun/docker_integration_test.go /project/internal/agentrun/forgejo.go /project/internal/agentrun/loop.go /project/internal/agentrun/roster.go /project/internal/agentrun/roster_test.go /project/internal/agentrun/run.go /project/internal/agentrun/seed_test.go /project/internal/agentrun/system.md /project/internal/config /project/internal/config/config.go /project/internal/config/config_test.go /project/internal/forgejo /project/internal/forgejo/client.go /project/internal/forgejo/event.go /project/internal/forgejo/poll.go /project/internal/forgejo/watcher.go /project/internal/forgejo/webhook.go /project/internal/forgejo/webhook_test.go /project/internal/livelog /project/internal/livelog/hub.go /project/internal/livelog/hub_test.go /project/internal/llm /project/internal/llm/client.go /project/internal/llm/streamer.go /project/internal/llm/streamer_test.go /project/internal/llm/types.go /project/internal/scheduler /project/internal/scheduler/scheduler.go /project/internal/scheduler/scheduler_test.go /project/internal/store /project/internal/store/schema.sql /project/internal/store/store.go /project/internal/store/store_test.go /project/internal/tools /project/internal/tools/bash.go /project/internal/tools/context.go /project/internal/tools/edit-file.go /project/internal/tools/forgejo.go /project/internal/tools/git.go /project/internal/tools/grep_search.go /project/internal/tools/list_files.go /project/internal/tools/move_file.go /project/internal/tools/read_file.go /project/internal/tools/registry.go /project/internal/tools/remove_file.go /project/internal/tools/shell.go /project/internal/tools/tools_test.go /project/internal/tools/write_file.go /project/internal/web /project/internal/web/templates.go /project/internal/web/web.go /project/internal/web/web_test.go /project/zoo.hcl.example
Tool 🔧 bash {"command": "cd /project && git log --oneline -5 && git status"}
Arguments
{"command": "cd /project && git log --oneline -5 && git status"}
Result
ea073a3 (HEAD -> issue-31-greg, origin/main, origin/HEAD, main) Merge pull request 'Add job overview on dashboard' (#26) from issue-24-anna into main 3b38675 feat(dashboard): add job overview on dashboard 1c33680 Merge pull request 'Move max_live_agents into the environment block' (#23) from issue-22-mika into main 7cf22ff Move max_live_agents into the environment block 94b8ca1 Merge pull request 'Add per-agent Forgejo tokens, deprecate Sudo: header approach' (#21) from issue-16-mika into main On branch issue-31-greg nothing to commit, working tree clean
Thinking
The grep tool is at `/project/internal/tools/grep_search.go`. Let's read it.
Tool 🔧 read_file {"path": "internal/tools/grep_search.go", "start_line": 1, "end_line": 200}
Arguments
{"path": "internal/tools/grep_search.go", "start_line": 1, "end_line": 200}
Result
{"path":"internal/tools/grep_search.go","content":"package tools\r\n\r\nimport (\r\n\t\"context\"\r\n\t\"fmt\"\r\n\t\"strconv\"\r\n\t\"strings\"\r\n\r\n\t\"github.com/abrander/zoo/internal/llm\"\r\n)\r\n\r\ntype grepSearchParams struct {\r\n\tPattern string `json:\"query\"`\r\n\tGlob string `json:\"glob\"`\r\n\tCaseSensitive bool `json:\"case_sensitive\"`\r\n\tContextBefore int `json:\"context_before\"`\r\n\tContextAfter int `json:\"context_after\"`\r\n\tMaxResults int `json:\"max_results\"`\r\n}\r\n\r\nfunc init() {\r\n\ttool := llm.NewTool(\r\n\t\t\"grep_search\",\r\n\t\t\"Search for a regular expression in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.\")\r\n\r\n\ttool.AddStringProperty(\"query\", \"The regex pattern to search for\", true)\r\n\ttool.AddStringProperty(\"glob\", \"Optional glob pattern to filter files, e.g. '*.go'\", false)\r\n\ttool.AddBooleanProperty(\"case_sensitive\", \"Whether the search should be case sensitive (default: false)\", false)\r\n\ttool.AddIntegerProperty(\"context_before\", \"Number of lines of context to show before each match (default: 0)\", false)\r\n\ttool.AddIntegerProperty(\"context_after\", \"Number of lines of context to show after each match (default: 0)\", false)\r\n\ttool.AddIntegerProperty(\"max_results\", \"Maximum number of matching lines to return (default: 100, 0 means no limit)\", false)\r\n\r\n\tRegister(tool, grepSearch)\r\n}\r\n\r\nfunc grepSearch(ctx Context, params grepSearchParams) (string, error) {\r\n\tmaxResults := params.MaxResults\r\n\tif maxResults == 0 {\r\n\t\tmaxResults = 100\r\n\t}\r\n\r\n\targs := []string{\"grep\", \"-Rn\", \"-I\"}\r\n\tif !params.CaseSensitive {\r\n\t\targs = append(args, \"-i\")\r\n\t}\r\n\r\n\tif params.ContextBefore \u003e 0 {\r\n\t\targs = append(args, \"-B\", strconv.Itoa(params.ContextBefore))\r\n\t}\r\n\r\n\tif params.ContextAfter \u003e 0 {\r\n\t\targs = append(args, \"-A\", strconv.Itoa(params.ContextAfter))\r\n\t}\r\n\r\n\tif params.Glob != \"\" {\r\n\t\targs = append(args, \"--include=\"+shellQuote(params.Glob))\r\n\t}\r\n\r\n\targs = append(args, \"-e\", shellQuote(params.Pattern), \"/project\")\r\n\r\n\tcmd := strings.Join(args, \" \") + fmt.Sprintf(\" | head -n %d\", maxResults)\r\n\r\n\toutput, err := ctx.Exec(context.Background(), cmd)\r\n\tif err != nil {\r\n\t\t// grep exits non-zero (with empty output) when there are no\r\n\t\t// matches; that's a normal result, not a tool failure.\r\n\t\tif strings.TrimSpace(output) == \"\" {\r\n\t\t\treturn \"No matches found.\", nil\r\n\t\t}\r\n\r\n\t\treturn \"\", fmt.Errorf(\"grep_search: %w\", err)\r\n\t}\r\n\r\n\tif strings.TrimSpace(output) == \"\" {\r\n\t\treturn \"No matches found.\", nil\r\n\t}\r\n\r\n\treturn output, nil\r\n}\r","start_line":1,"end_line":79,"total_lines":79,"truncated":false}
Thinking
The problem: "It doesn't actually use regex. Fix it. We love regex."
Looking at the code: `args = append(args, "-e", shellQuote(params.Pattern), "/project")`.
The `-e` flag for grep means "use the following as a pattern" — but by default, grep uses BRE (Basic Regular Expressions), not ERE (Extended Regular Expressions). So if you pass something like `foo|bar` or `(foo)`, it won't behave as the user expects as a regex. The tool's description says "search for a regular expression," but grep's default BRE mode doesn't support `|`, `+`, `?`, `()`, etc. without escaping. So "it doesn't actually use regex" — meaning, it's not really using regex in the way users expect (ERE/PCRE).
Fix: add `-E` (extended regex) to the arguments. That's the minimal, surgical fix.
Let me also check `shellQuote` and `ctx.Exec` to understand how the command is executed.
The issue is clear: the tool claims to search for a "regular expression" but invokes `grep` without `-E`, so it runs in BRE mode where `|`, `+`, `?`, `()` etc. don't work as regex metacharacters. Let me check the surrounding infrastructure before fixing.
Tool 🔧 read_file {"path": "internal/tools/shell.go", "start_line": 1, "end_line": 100}
Arguments
{"path": "internal/tools/shell.go", "start_line": 1, "end_line": 100}
Result
{"path":"internal/tools/shell.go","content":"package tools\r\n\r\nimport (\r\n\t\"context\"\r\n\t\"encoding/base64\"\r\n\t\"fmt\"\r\n\t\"strings\"\r\n)\r\n\r\n// shellQuote wraps s in single quotes for safe interpolation into a `sh\r\n// -c` command string, escaping any embedded single quotes.\r\nfunc shellQuote(s string) string {\r\n\treturn \"'\" + strings.ReplaceAll(s, \"'\", `'\\''`) + \"'\"\r\n}\r\n\r\nfunc resolvePath(path string) string {\r\n\tif path == \"\" {\r\n\t\treturn \"/project\"\r\n\t}\r\n\r\n\tif path == \".\" || path == \"./\" {\r\n\t\treturn \"/project\"\r\n\t}\r\n\r\n\tif strings.HasPrefix(path, \"/project/\") {\r\n\t\treturn path\r\n\t}\r\n\r\n\tif !strings.HasPrefix(path, \"/\") {\r\n\t\treturn \"/project/\" + strings.TrimPrefix(path, \"/\")\r\n\t}\r\n\r\n\treturn path\r\n}\r\n\r\nfunc shellReadFile(ctx Context, path string) ([]byte, error) {\r\n\tp := resolvePath(path)\r\n\r\n\t// We use base64 encoding to avoid issues with binary data and\r\n\t// special characters in the file content. The output of the command\r\n\t// will be base64-encoded, which we then decode in Go.\r\n\toutput, err := ctx.Exec(context.Background(), \"base64 \"+shellQuote(p))\r\n\tif err != nil {\r\n\t\treturn nil, err\r\n\t}\r\n\r\n\tdecoded, err := base64.StdEncoding.DecodeString(output)\r\n\tif err != nil {\r\n\t\treturn nil, fmt.Errorf(\"decode base64 output of %q: %w\", path, err)\r\n\t}\r\n\r\n\treturn decoded, nil\r\n}\r\n\r\nfunc shellWriteFile(ctx Context, path string, content []byte) error {\r\n\tp := resolvePath(path)\r\n\tencoded := base64.StdEncoding.EncodeToString(content)\r\n\r\n\tcmd := fmt.Sprintf(\r\n\t\t`mkdir -p \"$(dirname %s)\" \u0026\u0026 echo %s | base64 -d \u003e %s`,\r\n\t\tshellQuote(p), shellQuote(encoded), shellQuote(p))\r\n\r\n\t_, err := ctx.Exec(context.Background(), cmd)\r\n\tif err != nil {\r\n\t\treturn fmt.Errorf(\"write %q: %w\", path, err)\r\n\t}\r\n\r\n\treturn nil\r\n}\r","start_line":1,"end_line":69,"total_lines":69,"truncated":false}
Tool 🔧 read_file {"path": "internal/tools/tools_test.go", "start_line": 1, "end_line": 150}
Arguments
{"path": "internal/tools/tools_test.go", "start_line": 1, "end_line": 150}
Result
{"path":"internal/tools/tools_test.go","content":"package tools\r\n\r\nimport (\r\n\t\"context\"\r\n\t\"strings\"\r\n\t\"testing\"\r\n)\r\n\r\ntype fakeForgejoActions struct {\r\n\tcomments []string\r\n\tassigned []string\r\n}\r\n\r\nfunc (f *fakeForgejoActions) Comment(body string) error {\r\n\tf.comments = append(f.comments, body)\r\n\treturn nil\r\n}\r\nfunc (f *fakeForgejoActions) OpenPullRequest(head, base, title, body string) error { return nil }\r\nfunc (f *fakeForgejoActions) RequestReview(reviewers []string) error { return nil }\r\nfunc (f *fakeForgejoActions) AddLabel(name string) error { return nil }\r\nfunc (f *fakeForgejoActions) RemoveLabel(name string) error { return nil }\r\nfunc (f *fakeForgejoActions) CloseIssue() error { return nil }\r\nfunc (f *fakeForgejoActions) ReopenIssue() error { return nil }\r\nfunc (f *fakeForgejoActions) AssignIssue(agentName string) error {\r\n\tf.assigned = append(f.assigned, agentName)\r\n\treturn nil\r\n}\r\n\r\ntype fakeContext struct {\r\n\tlastCmd string\r\n\toutput string\r\n\terr error\r\n\tfg *fakeForgejoActions\r\n\r\n\tlastGitSubcommand string\r\n\tlastGitArgs []string\r\n}\r\n\r\nfunc (f *fakeContext) Exec(ctx context.Context, command string) (string, error) {\r\n\tf.lastCmd = command\r\n\treturn f.output, f.err\r\n}\r\n\r\nfunc (f *fakeContext) Git(ctx context.Context, subcommand string, args ...string) (string, error) {\r\n\tf.lastGitSubcommand = subcommand\r\n\tf.lastGitArgs = args\r\n\treturn f.output, f.err\r\n}\r\n\r\nfunc (f *fakeContext) Forgejo() ForgejoActions {\r\n\treturn f.fg\r\n}\r\n\r\nfunc TestShellQuote(t *testing.T) {\r\n\tcases := map[string]string{\r\n\t\t\"simple\": \"'simple'\",\r\n\t\t\"it's a dir\": `'it'\\''s a dir'`,\r\n\t}\r\n\tfor in, want := range cases {\r\n\t\tif got := shellQuote(in); got != want {\r\n\t\t\tt.Errorf(\"shellQuote(%q) = %q, want %q\", in, got, want)\r\n\t\t}\r\n\t}\r\n}\r\n\r\nfunc TestReadFileParsesMetaAndContent(t *testing.T) {\r\n\tfc := \u0026fakeContext{output: \"3\\nline one\\nline two\\nline three\\n\"}\r\n\r\n\tout, err := readFile(fc, readFileParams{Path: \"src/main.go\"})\r\n\tif err != nil {\r\n\t\tt.Fatal(err)\r\n\t}\r\n\r\n\tif !strings.Contains(fc.lastCmd, \"/project/src/main.go\") {\r\n\t\tt.Fatalf(\"expected command to reference /project/src/main.go, got %q\", fc.lastCmd)\r\n\t}\r\n\tif !strings.Contains(out, \"line one\") || !strings.Contains(out, `\"total_lines\":3`) {\r\n\t\tt.Fatalf(\"unexpected result: %s\", out)\r\n\t}\r\n\tif strings.Contains(out, `\"truncated\":true`) {\r\n\t\tt.Fatalf(\"full read should not be truncated: %s\", out)\r\n\t}\r\n}\r\n\r\nfunc TestGitRejectsDisallowedSubcommand(t *testing.T) {\r\n\tfc := \u0026fakeContext{}\r\n\r\n\t_, err := git(fc, gitParams{Subcommand: \"push-force\"})\r\n\tif err == nil {\r\n\t\tt.Fatal(\"expected error for disallowed subcommand\")\r\n\t}\r\n}\r\n\r\nfunc TestGitPassesSubcommandAndArgsThrough(t *testing.T) {\r\n\tfc := \u0026fakeContext{output: \"ok\"}\r\n\r\n\t_, err := git(fc, gitParams{Subcommand: \"commit\", Args: []string{\"-m\", \"fix: handle it's edge case\"}})\r\n\tif err != nil {\r\n\t\tt.Fatal(err)\r\n\t}\r\n\r\n\tif fc.lastGitSubcommand != \"commit\" {\r\n\t\tt.Fatalf(\"expected subcommand %q, got %q\", \"commit\", fc.lastGitSubcommand)\r\n\t}\r\n\tif len(fc.lastGitArgs) != 2 || fc.lastGitArgs[1] != \"fix: handle it's edge case\" {\r\n\t\tt.Fatalf(\"expected args passed through unescaped, got %v\", fc.lastGitArgs)\r\n\t}\r\n}\r\n\r\nfunc TestCommentToolCallsForgejo(t *testing.T) {\r\n\tfg := \u0026fakeForgejoActions{}\r\n\tfc := \u0026fakeContext{fg: fg}\r\n\r\n\tif _, err := comment(fc, commentParams{Body: \"hello\"}); err != nil {\r\n\t\tt.Fatal(err)\r\n\t}\r\n\r\n\tif len(fg.comments) != 1 || fg.comments[0] != \"hello\" {\r\n\t\tt.Fatalf(\"unexpected comments: %v\", fg.comments)\r\n\t}\r\n}\r\n\r\nfunc TestAssignIssueToolCallsForgejo(t *testing.T) {\r\n\tfg := \u0026fakeForgejoActions{}\r\n\tfc := \u0026fakeContext{fg: fg}\r\n\r\n\tout, err := assignIssue(fc, assignIssueParams{Agent: \"greg\"})\r\n\tif err != nil {\r\n\t\tt.Fatal(err)\r\n\t}\r\n\tif out != \"Assigned to greg\" {\r\n\t\tt.Fatalf(\"unexpected result: %q\", out)\r\n\t}\r\n\tif len(fg.assigned) != 1 || fg.assigned[0] != \"greg\" {\r\n\t\tt.Fatalf(\"unexpected assignments: %v\", fg.assigned)\r\n\t}\r\n}\r\n\r\nfunc TestRegistryRoundTrip(t *testing.T) {\r\n\tif len(All()) == 0 {\r\n\t\tt.Fatal(\"expected registered tools\")\r\n\t}\r\n\r\n\tfound := false\r\n\tfor _, tl := range All() {\r\n\t\tif tl.Function.Name == \"bash\" {\r\n\t\t\tfound = true\r\n\t\t}\r\n\t}\r\n\tif !found {\r","start_line":1,"end_line":150,"total_lines":153,"truncated":true}
Thinking
Now I understand the setup. The fix is simple: add `-E` to the grep arguments so that the pattern is interpreted as an extended regular expression (ERE), which is what users (and the tool description) expect when they say "regex".
The tool description says "Search for a regular expression in project files". In BRE (grep's default), metacharacters like `|`, `+`, `?`, `()`, `{}` don't function as regex operators. So when an agent searches with something like `foo|bar` or `func\(`, it fails. Adding `-E` makes it a proper ERE search.
Minimal surgical fix:
```go
args := []string{"grep", "-Rn", "-I", "-E"}
```
Wait, one thing to consider: `-R` and `-I` — no problem. Adding `-E` is the standard fix.
Should I also consider PCRE (`-P`)? GNU grep supports `-P`, but busybox grep (which is often used in containers) may not support `-P`. `-E` is universally supported. ERE is the right choice.
Let me check what shell Exec uses — probably `sh -c`. Let me check the Context interface and how Exec works in docker.go.
Also, let me check whether there are existing tests for grep_search. Looking at tools_test.go — I didn't see any grep tests. Let me look at the rest of the test file (lines 150–153) and check the Context interface in context.go.
Let me see the rest of the test file and the Context interface:
Tool 🔧 read_file {"path": "internal/tools/tools_test.go", "start_line": 150, "end_line": 153}
Arguments
{"path": "internal/tools/tools_test.go", "start_line": 150, "end_line": 153}
Result
{"path":"internal/tools/tools_test.go","content":"\tif !found {\r\n\t\tt.Fatal(\"expected bash tool to be registered\")\r\n\t}\r\n}\r","start_line":150,"end_line":153,"total_lines":153,"truncated":false}
Tool 🔧 read_file {"path": "internal/tools/context.go", "start_line": 1, "end_line": 80}
Arguments
{"path": "internal/tools/context.go", "start_line": 1, "end_line": 80}
Result
{"path":"internal/tools/context.go","content":"// Package tools is the registry of functions an agent's tool-calling\r\n// loop can invoke, ported from ../a/tools but retargeted at a Docker\r\n// container (via Exec) and the Forgejo issue/PR that triggered the run\r\n// (via Forgejo()) instead of a local sandboxed filesystem.\r\npackage tools\r\n\r\nimport \"context\"\r\n\r\n// Context is bound to a single agent run (job), unlike ../a's single\r\n// global Context, since multiple agents run concurrently in zoo.\r\ntype Context interface {\r\n\t// Exec runs command inside the run's container via `sh -c` and\r\n\t// returns combined stdout+stderr. The container never holds a\r\n\t// Forgejo credential, so this cannot reach the Forgejo API or\r\n\t// authenticate git operations against it — see Git.\r\n\tExec(ctx context.Context, command string) (string, error)\r\n\r\n\t// Git runs a git subcommand against the run's working tree on the\r\n\t// host, outside the container, so that operations needing a Forgejo\r\n\t// credential (currently just push) can authenticate without that\r\n\t// credential ever being written to disk where the container (and\r\n\t// anything run inside it via Exec) could read it.\r\n\tGit(ctx context.Context, subcommand string, args ...string) (string, error)\r\n\r\n\t// Forgejo returns the actions bound to the issue/PR that triggered\r\n\t// this run, so tools don't need to be told which repo/issue to act\r\n\t// on.\r\n\tForgejo() ForgejoActions\r\n}\r\n\r\n// ForgejoActions are the actions available to an agent against the\r\n// triggering issue/PR. Implemented by internal/agentrun, backed by\r\n// internal/forgejo.Client plus the run's owner/repo/issue.\r\ntype ForgejoActions interface {\r\n\tComment(body string) error\r\n\tOpenPullRequest(head, base, title, body string) error\r\n\tRequestReview(reviewers []string) error\r\n\tAddLabel(name string) error\r\n\tRemoveLabel(name string) error\r\n\tCloseIssue() error\r\n\tReopenIssue() error\r\n\r\n\t// AssignIssue hands the triggering issue/PR off to another agent by\r\n\t// their name (which doubles as their Forgejo username); the\r\n\t// resulting issue:assigned event triggers that agent's run.\r\n\tAssignIssue(agentName string) error\r\n}\r","start_line":1,"end_line":47,"total_lines":47,"truncated":false}
Thinking
Now I have a grasp of the whole picture. The fix is to add `-E` to the grep invocation so that the pattern is interpreted as an extended regular expression (ERE) — which is what "regex" means in the tool's description.
The surgical change in `internal/tools/grep_search.go`:
```go
args := []string{"grep", "-Rn", "-I", "-E"}
```
I'll also add a test that verifies the command contains `-E`. The test file uses `fakeContext` which captures `lastCmd`, so I can write a test like:
```go
func TestGrepSearchUsesExtendedRegex(t *testing.T) {
fc := &fakeContext{output: "/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 -E") {
t.Fatalf("expected grep to use extended regex (-E), got %q", fc.lastCmd)
}
if !strings.Contains(out, "foo|bar") {
t.Fatalf("unexpected result: %s", out)
}
}
```
This matches the existing test style.
Also, I'll check the tool's description — it says "Search for a regular expression in project files". That's fine as-is. It might be worth clarifying that it's ERE. The description is already good. I could tweak it slightly to say "extended regular expression" so the LLM knows which flavor it is. That's a nice touch: "Search for an extended regular expression (ERE) in project files...". I'll make that small tweak too so the agent knows exactly which regex flavor it's dealing with.
Let's make the changes.
Now I have the full picture. The bug: `grep` defaults to **BRE** (basic regular expressions), where metacharacters like `|`, `+`, `?`, `()`, `{}` are literal — so a pattern like `foo|bar` or `func\(` won't behave as a regex, contradicting the tool's own description. The fix is to add `-E` so patterns are interpreted as extended regular expressions (ERE), which is the universally supported "regex" mode (unlike `-P`/PCRE, which busybox grep may lack).
Tool 🔧 edit_file {"path": "internal/tools/grep_search.go", "find": "\targs := []string{\"grep\", \"-Rn\", \"-I\"}", "replace": "\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\targs := []string{\"grep\", \"-Rn\", \"-I\", \"-E\"}"}
Arguments
{"path": "internal/tools/grep_search.go", "find": "\targs := []string{\"grep\", \"-Rn\", \"-I\"}", "replace": "\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\targs := []string{\"grep\", \"-Rn\", \"-I\", \"-E\"}"}
Result
1 occurrences replaced
Tool 🔧 edit_file {"path": "internal/tools/grep_search.go", "find": "\t\t\"Search for a regular expression in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.\")", "replace": "\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.\")"}
Arguments
{"path": "internal/tools/grep_search.go", "find": "\t\t\"Search for a regular expression in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.\")", "replace": "\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.\")"}
Result
1 occurrences replaced
Thinking
Next, I'll add a test that verifies the command uses `-E`. I'll append it to tools_test.go.
Now add a regression test in the existing test style:
Tool 🔧 edit_file {"path": "internal/tools/tools_test.go", "find": "func TestRegistryRoundTrip(t *testing.T) {", "replace": "func TestGrepSearchUsesExtendedRegex(t *testing.T) {\n\tfc := &fakeContext{output: \"/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 -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\nfunc TestGrepSearchNoMatches(t *testing.T) {\n\tfc := &fakeContext{output: \"\", 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 TestRegistryRoundTrip(t *testing.T) {"}
Arguments
{"path": "internal/tools/tools_test.go", "find": "func TestRegistryRoundTrip(t *testing.T) {", "replace": "func TestGrepSearchUsesExtendedRegex(t *testing.T) {\n\tfc := &fakeContext{output: \"/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 -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\nfunc TestGrepSearchNoMatches(t *testing.T) {\n\tfc := &fakeContext{output: \"\", 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 TestRegistryRoundTrip(t *testing.T) {"}
Result
1 occurrences replaced
Thinking
I used `fmt.Errorf` in the test, but I need to make sure `fmt` is imported in tools_test.go. The current imports are `context`, `strings`, and `testing`. Let me add `fmt`.
I need to add the `fmt` import to the test file:
Tool 🔧 edit_file {"path": "internal/tools/tools_test.go", "find": "import (\n\t\"context\"\n\t\"strings\"\n\t\"testing\"\n)", "replace": "import (\n\t\"context\"\n\t\"fmt\"\n\t\"strings\"\n\t\"testing\"\n)"}
Arguments
{"path": "internal/tools/tools_test.go", "find": "import (\n\t\"context\"\n\t\"strings\"\n\t\"testing\"\n)", "replace": "import (\n\t\"context\"\n\t\"fmt\"\n\t\"strings\"\n\t\"testing\"\n)"}
Result
1 occurrences replaced
Thinking
Wait, I need to re-check the no-match path in grepSearch. When grep exits with non-zero (no matches), `ctx.Exec` returns an error. The code looks like this:
```go
output, err := ctx.Exec(context.Background(), cmd)
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) == "" {
return "No matches found.", nil
}
return "", fmt.Errorf("grep_search: %w", err)
}
```
OK, so in the case of `output: ""` and `err: fmt.Errorf("exit status 1")`, it returns "No matches found.", nil. Good, my test should pass.
Next, let me verify that the whole file compiles and the tests pass. I'll try running `go build ./...` and `go test ./internal/tools/`.
Now verify the changes and run the tests:
Tool 🔧 bash {"command": "cd /project && go build ./... && go vet ./internal/tools/ && go test ./internal/tools/ -v -run 'Grep|ShellQuote' 2>&1 | tail -20"}
Arguments
{"command": "cd /project && go build ./... && go vet ./internal/tools/ && go test ./internal/tools/ -v -run 'Grep|ShellQuote' 2>&1 | tail -20"}
Result
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 modernc.org/libc v1.74.4 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 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 golang.org/x/text v0.40.0 go: downloading github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec === RUN TestShellQuote --- PASS: TestShellQuote (0.00s) === RUN TestGrepSearchUsesExtendedRegex --- PASS: TestGrepSearchUsesExtendedRegex (0.00s) === RUN TestGrepSearchNoMatches --- PASS: TestGrepSearchNoMatches (0.00s) PASS ok github.com/abrander/zoo/internal/tools 0.003s
Thinking
The build succeeded, vet passed, and the new test also passed. Just to be safe, I'll run the full test suite for the tools package, and also do a quick sanity check on the actual grep behavior to confirm that the semantics of `-E` are correct.
Build, vet, and new tests pass. Let me run the full test suite and do a real-world sanity check of the exact command the tool now builds:
Tool 🔧 bash {"command": "cd /project && go test ./internal/tools/ 2>&1 | tail -3"}
Arguments
{"command": "cd /project && go test ./internal/tools/ 2>&1 | tail -3"}
Result
ok github.com/abrander/zoo/internal/tools 0.003s
Tool 🔧 bash {"command": "cd /tmp && mkdir -p greptest && printf 'func main() {\\n fmt.Println(\"foo|bar\")\\n x := 1+2\\n}\\n' > greptest/main.go && echo \"--- old behavior (BRE, no -E):\" && grep -Rn -I -i -e 'foo|bar' greptest/ ; echo \"exit=$?\" ; echo \"--- new behavior (ERE, -E):\" && grep -Rn -I -E -i -e 'foo|bar' greptest/ ; echo \"exit=$?\""}
Arguments
{"command": "cd /tmp && mkdir -p greptest && printf 'func main() {\\n fmt.Println(\"foo|bar\")\\n x := 1+2\\n}\\n' > greptest/main.go && echo \"--- old behavior (BRE, no -E):\" && grep -Rn -I -i -e 'foo|bar' greptest/ ; echo \"exit=$?\" ; echo \"--- new behavior (ERE, -E):\" && grep -Rn -I -E -i -e 'foo|bar' greptest/ ; echo \"exit=$?\""}
Result
--- old behavior (BRE, no -E):
greptest/main.go:2: fmt.Println("foo|bar")
exit=0
--- new behavior (ERE, -E):
greptest/main.go:2: fmt.Println("foo|bar")
exit=0
Thinking
Hmm, in this test both matched. That's because the literal string "foo|bar" is contained in the file. Let me do a better test. I'll search for a pattern that only matches as ERE, for example `foo|baz` (where "baz" is in the file but "foo" isn't... no wait, "foo" is there). Let me try a pattern where BRE and ERE differ: for example, searching for `1+2` — in BRE, `+` is a literal, so `1+2` matches the literal "1+2" (which exists on line 3). In ERE, `1+2` means "one or more 1s followed by 2", which also matches "12"... hmm, "1+2" as ERE matches "12" (one or more 1s followed by 2). Line 3 is `x := 1+2`, which contains "12"? No — "1+2" is the characters 1, +, 2. The ERE `1+2` matches "12" (112, 12...). "1+2" doesn't contain a consecutive "12"... wait, "1+2" — the characters are '1', '+', '2'. The substring "12" doesn't exist. So the ERE `1+2` doesn't match line 3, but the BRE `1+2` matches line 3 literally.
A better test: a pattern like `main|other`. Let me create a file containing "other" and search for `main|other`:
- BRE: the literal "main|other" — no match (exit 1)
- ERE: matches both "main" and "other" (exit 0)
This clearly demonstrates the difference.
That test wasn't discriminating (the literal string was present). Let me verify with a pattern where BRE and ERE genuinely differ:
Tool 🔧 bash {"command": "cd /tmp/greptest && printf 'other thing\\n' > other.txt && echo \"--- BRE (old): grep -Rn -I -i -e 'main|other'\" && grep -Rn -I -i -e 'main|other' . ; echo \"exit=$?\" ; echo \"--- ERE (new): grep -Rn -I -E -i -e 'main|other'\" && grep -Rn -I -E -i -e 'main|other' . ; echo \"exit=$?\" ; echo \"--- ERE with groups/quantifiers: grep -Rn -I -E -e '(main|other)' .\" && grep -Rn -I -E -e '(main|other)' . ; echo \"exit=$?\""}
Arguments
{"command": "cd /tmp/greptest && printf 'other thing\\n' > other.txt && echo \"--- BRE (old): grep -Rn -I -i -e 'main|other'\" && grep -Rn -I -i -e 'main|other' . ; echo \"exit=$?\" ; echo \"--- ERE (new): grep -Rn -I -E -i -e 'main|other'\" && grep -Rn -I -E -i -e 'main|other' . ; echo \"exit=$?\" ; echo \"--- ERE with groups/quantifiers: grep -Rn -I -E -e '(main|other)' .\" && grep -Rn -I -E -e '(main|other)' . ; echo \"exit=$?\""}
Result
--- BRE (old): grep -Rn -I -i -e 'main|other'
exit=1
--- ERE (new): grep -Rn -I -E -i -e 'main|other'
./main.go:1:func main() {
./other.txt:1:other thing
exit=0
--- ERE with groups/quantifiers: grep -Rn -I -E -e '(main|other)' .
./main.go:1:func main() {
./other.txt:1:other thing
exit=0
Thinking
Confirmed:
- Old behavior (BRE): `main|other` → no matches (the `|` was treated as a literal)
- New behavior (ERE): `main|other` → matches both files, and groups/quantifiers also work.
The fix is working. Next, let me check the final state of the modified files, then commit, push, and open a PR.
Confirmed — the old BRE behavior failed to match `main|other` (treating `|` as literal), while the new ERE behavior matches correctly, and groups/quantifiers work too. Let me review the final diff and commit:
Tool 🔧 bash {"command": "cd /project && git diff"}
Arguments
{"command": "cd /project && git diff"}
Result
diff --git a/internal/tools/grep_search.go b/internal/tools/grep_search.go
index 15be9d4..b546e2b 100644
--- a/internal/tools/grep_search.go
+++ b/internal/tools/grep_search.go
@@ -21,7 +21,7 @@ type grepSearchParams struct {
func init() {
tool := llm.NewTool(
"grep_search",
- "Search for a regular expression in project files (in the project container). Supports context lines, a glob filter, and case sensitivity control.")
+ "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'", false)
@@ -39,7 +39,11 @@ func grepSearch(ctx Context, params grepSearchParams) (string, error) {
maxResults = 100
}
- args := []string{"grep", "-Rn", "-I"}
+ // -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.
+ args := []string{"grep", "-Rn", "-I", "-E"}
if !params.CaseSensitive {
args = append(args, "-i")
}
diff --git a/internal/tools/tools_test.go b/internal/tools/tools_test.go
index f407147..eee2203 100644
--- a/internal/tools/tools_test.go
+++ b/internal/tools/tools_test.go
@@ -2,6 +2,7 @@ package tools
import (
"context"
+ "fmt"
"strings"
"testing"
)
@@ -136,6 +137,33 @@ func TestAssignIssueToolCallsForgejo(t *testing.T) {
}
}
+func TestGrepSearchUsesExtendedRegex(t *testing.T) {
+ fc := &fakeContext{output: "/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 -E") {
+ t.Fatalf("expected grep to be invoked with -E (extended regex), got %q", fc.lastCmd)
+ }
+ if !strings.Contains(out, "foo|bar") {
+ t.Fatalf("unexpected result: %s", out)
+ }
+}
+
+func TestGrepSearchNoMatches(t *testing.T) {
+ fc := &fakeContext{output: "", 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)
+ }
+}
+
func TestRegistryRoundTrip(t *testing.T) {
if len(All()) == 0 {
t.Fatal("expected registered tools")
Thinking
The diff looks clean and surgical. Let's commit and push, then open a PR.
Clean and surgical. Committing and pushing:
Tool 🔧 bash {"command": "cd /project && git add internal/tools/grep_search.go internal/tools/tools_test.go && git commit -m \"fix(tools): make grep_search actually use regex (ERE)\n\ngrep defaults to BRE, where |, +, ?, (), {} are literal characters,\nso patterns like 'foo|bar' never matched as the tool description\npromised. Add -E so patterns are interpreted as extended regular\nexpressions, and clarify the tool description to say ERE.\n\nAdd regression tests: one asserting -E is in the invoked command,\none covering the no-match path.\" && git push -u origin issue-31-greg"}
Arguments
{"command": "cd /project && git add internal/tools/grep_search.go internal/tools/tools_test.go && git commit -m \"fix(tools): make grep_search actually use regex (ERE)\n\ngrep defaults to BRE, where |, +, ?, (), {} are literal characters,\nso patterns like 'foo|bar' never matched as the tool description\npromised. Add -E so patterns are interpreted as extended regular\nexpressions, and clarify the tool description to say ERE.\n\nAdd regression tests: one asserting -E is in the invoked command,\none covering the no-match path.\" && git push -u origin issue-31-greg"}
Result
ERROR CALLING TOOL: command failed: command exited with status 128
Thinking
The push failed with exit code 128. Let me check what happened — it might be a remote configuration issue. Let me try running the steps individually to see the error.
Tool 🔧 bash {"command": "cd /project && git status && git log --oneline -2 && git remote -v"}
Arguments
{"command": "cd /project && git status && git log --oneline -2 && git remote -v"}
Result
On branch issue-31-greg nothing to commit, working tree clean 2c5b978 (HEAD -> issue-31-greg) fix(tools): make grep_search actually use regex (ERE) ea073a3 (origin/main, origin/HEAD, main) Merge pull request 'Add job overview on dashboard' (#26) from issue-24-anna into main origin https://code.stdio.dk/abrander/zoo.git (fetch) origin https://code.stdio.dk/abrander/zoo.git (push)
Thinking
The commit succeeded (2c5b978), but the push failed with exit 128. The remote is an HTTPS URL. Maybe the push requires the `git` tool rather than bash (the system prompt says "for remote git operations (pull, fetch, push, etc.), use the `git` tool"). Let me try using the git tool for the push.
The commit succeeded but the push failed — per the environment, remote git operations should use the `git` tool:
Tool 🔧 git {"subcommand": "push", "args": ["-u", "origin", "issue-31-greg"]}
Arguments
{"subcommand": "push", "args": ["-u", "origin", "issue-31-greg"]}
Result
To https://code.stdio.dk/abrander/zoo.git * [new branch] issue-31-greg -> issue-31-greg branch 'issue-31-greg' set up to track 'origin/issue-31-greg'.
Thinking
The push succeeded. Next, I'll open a pull request.
Pushed. Now opening the PR:
Tool 🔧 open_pull_request {"head": "issue-31-greg", "base": "main", "title": "fix(tools): make grep_search actually use regex (ERE)", "body": "## Problem\n\n`grep_search` advertised itself as a regex search, but it invoked `grep` without `-E`, so patterns were interpreted as **BRE** (basic regular expressions). In BRE, `|`, `+`, `?`, `()`, `{}` are literal characters — so a pattern like `foo|bar` or `func\\(` would never match as a regex, and agents using the tool got no results for perfectly valid regexes.\n\n## Fix\n\n- Add `-E` to the grep invocation so patterns are interpreted as **extended regular expressions** (the \"real\" regex flavor: alternation, groups, quantifiers all work).\n- Chose ERE over PCRE (`-P`) because `-E` is universally supported, including by busybox grep in minimal containers.\n- Clarified the tool description to say \"extended regular expression (ERE)\" with an example, so the LLM knows exactly which flavor it's writing.\n\n## Verification\n\n- New regression test `TestGrepSearchUsesExtendedRegex` asserts the command contains `grep -Rn -I -E`.\n- New test `TestGrepSearchNoMatches` covers the no-match exit path.\n- `go build ./...`, `go vet`, and `go test ./internal/tools/` all pass.\n- Manual check: `grep -Rn -I -i -e 'main|other'` (old) → no matches, exit 1; `grep -Rn -I -E -i -e 'main|other'` (new) → matches both files, exit 0."}
Arguments
{"head": "issue-31-greg", "base": "main", "title": "fix(tools): make grep_search actually use regex (ERE)", "body": "## Problem\n\n`grep_search` advertised itself as a regex search, but it invoked `grep` without `-E`, so patterns were interpreted as **BRE** (basic regular expressions). In BRE, `|`, `+`, `?`, `()`, `{}` are literal characters — so a pattern like `foo|bar` or `func\\(` would never match as a regex, and agents using the tool got no results for perfectly valid regexes.\n\n## Fix\n\n- Add `-E` to the grep invocation so patterns are interpreted as **extended regular expressions** (the \"real\" regex flavor: alternation, groups, quantifiers all work).\n- Chose ERE over PCRE (`-P`) because `-E` is universally supported, including by busybox grep in minimal containers.\n- Clarified the tool description to say \"extended regular expression (ERE)\" with an example, so the LLM knows exactly which flavor it's writing.\n\n## Verification\n\n- New regression test `TestGrepSearchUsesExtendedRegex` asserts the command contains `grep -Rn -I -E`.\n- New test `TestGrepSearchNoMatches` covers the no-match exit path.\n- `go build ./...`, `go vet`, and `go test ./internal/tools/` all pass.\n- Manual check: `grep -Rn -I -i -e 'main|other'` (old) → no matches, exit 1; `grep -Rn -I -E -i -e 'main|other'` (new) → matches both files, exit 0."}
Result
Pull request opened
Thinking
The PR has been opened. Next, I'll leave a comment on the issue summarizing what was done.
Tool 🔧 comment {"body": "Fixed! 🎉\n\n**The bug:** `grep_search` claimed to search for \"a regular expression\" but invoked `grep` without `-E`, so patterns were interpreted as **BRE** (basic regular expressions). In BRE, `|`, `+`, `?`, `()`, `{}` are treated as *literal* characters — so a pattern like `foo|bar` would never match as a regex. It was regex in name only.\n\n**The fix** (PR open for review):\n- Added `-E` to the grep invocation → patterns are now interpreted as **extended regular expressions**, where all the usual metacharacters work.\n- Chose ERE over PCRE (`-P`) since `-E` is universally supported, including in minimal/busybox containers.\n- Updated the tool description to explicitly say \"extended regular expression (ERE)\" with an example, so agents know exactly which regex flavor they're writing.\n\n**Verified:**\n- New regression test asserting `-E` is in the command, plus a test for the no-match path.\n- `go build`, `go vet`, and `go test ./internal/tools/` all pass.\n- Manual check: searching `main|other` — old command: no matches (exit 1); new command: matches both files (exit 0).\n\nWe love regex. Now it's real regex."}
Arguments
{"body": "Fixed! 🎉\n\n**The bug:** `grep_search` claimed to search for \"a regular expression\" but invoked `grep` without `-E`, so patterns were interpreted as **BRE** (basic regular expressions). In BRE, `|`, `+`, `?`, `()`, `{}` are treated as *literal* characters — so a pattern like `foo|bar` would never match as a regex. It was regex in name only.\n\n**The fix** (PR open for review):\n- Added `-E` to the grep invocation → patterns are now interpreted as **extended regular expressions**, where all the usual metacharacters work.\n- Chose ERE over PCRE (`-P`) since `-E` is universally supported, including in minimal/busybox containers.\n- Updated the tool description to explicitly say \"extended regular expression (ERE)\" with an example, so agents know exactly which regex flavor they're writing.\n\n**Verified:**\n- New regression test asserting `-E` is in the command, plus a test for the no-match path.\n- `go build`, `go vet`, and `go test ./internal/tools/` all pass.\n- Manual check: searching `main|other` — old command: no matches (exit 1); new command: matches both files (exit 0).\n\nWe love regex. Now it's real regex."}
Result
Comment posted
Thinking
Everything is complete:
1. ✅ Identified the bug: grep was being run in BRE mode without `-E`
2. ✅ Fixed by adding `-E` and updating the tool description
3. ✅ Added regression tests
4. ✅ Build, vet, and tests all pass
5. ✅ Manually verified the behavioral difference
6. ✅ Committed and pushed the branch
7. ✅ Opened a PR
8. ✅ Posted a summary comment on the issue
Done. Let me present a brief summary.
Done. Summary of the work on issue #31 "Fix the grep tool":
**Root cause:** `internal/tools/grep_search.go` advertised itself as a regex search but invoked `grep` without `-E`, so patterns were interpreted as **BRE** where `|`, `+`, `?`, `()`, `{}` are literal characters — a pattern like `foo|bar` could never match as a regex.
**Changes:**
1. **`internal/tools/grep_search.go`** — added `-E` to the grep args (patterns now interpreted as ERE, the universally supported "real" regex flavor, unlike PCRE which busybox grep may lack) and clarified the tool description to say "extended regular expression (ERE)" with an example.
2. **`internal/tools/tools_test.go`** — added `TestGrepSearchUsesExtendedRegex` (asserts the command contains `grep -Rn -I -E`) and `TestGrepSearchNoMatches` (covers the no-match exit path).
**Verification:** `go build ./...`, `go vet`, and `go test ./internal/tools/` all pass. Manual check confirmed the behavioral difference: searching `main|other` with the old command returned no matches (exit 1); with `-E` it matches both files (exit 0).
The branch `issue-31-greg` is pushed, a PR is open against `main`, and the issue has a summary comment.