Git Investigate Skill
Trigger
- Keywords: code history, git blame, track changes, who wrote this, when was it changed, root cause, code archaeology
When NOT to Use
- Code review (use codex-review)
- Feature development (use feature-dev)
- Just want to read code (use Read directly)
Command
/git-investigate src/service/xxx.ts:123 # Specific line
/git-investigate processToken # Function name
/git-investigate "error message" # Keyword
Workflow
Locate code -> git blame -> find commit -> trace history -> analyze changes -> report
Investigation Framework
| Question | Method |
|---|
| Who wrote it? | git blame |
| When was it changed? | git log --follow |
| Why was it changed? | commit message + PR |
| What was missed? | git diff compare original vs problematic version |
Common Patterns
| Pattern | Symptom | Root Cause |
|---|
| Type removed | Enum value deleted | Assumed no longer needed |
| Condition simplified | If conditions reduced | Missed during refactoring |
| Rename | Partially unchanged | Incomplete search-and-replace |
| Boundary ignored | Only handles main flow | Edge cases not considered |
Output
## Git Investigation Report
- **Target**: <file/feature>
- **Timeline**: <commit range>
- **Root cause**: <analysis>
- **Introduced by**: <commit hash + author>
Verification
- Report includes: investigation target, author info, timeline, original vs problematic code
- Root cause has clear analysis
- Fix recommendation is specific and actionable
References
references/commands.md - Git command reference + report template
Examples
Input: Who changed this line of code?
Action: git blame -> find commit -> trace PR -> output report
Input: When was this bug introduced?
Action: git log -p -S -> locate introduction point -> analyze cause -> output report
