fix-bug

name	fix-bug
description	Fix a bug with systematic debugging, TDD, and PR workflow
user_invocable	true

Fix Bug Workflow

Follow this exact sequence. No plan needed — go straight to debugging.

1. Sync main

git checkout main && git pull

2. Systematic Debugging

• DO NOT guess fixes — find root cause first
• Phase 1: Read errors, reproduce, check recent changes (git log --oneline -10), gather evidence
• Phase 2: Find working examples in the codebase, compare
• Phase 3: Form a single hypothesis, test minimally
• Phase 4: Implement fix with test

3. Create worktree and branch

git worktree add .claude/worktrees/fix-<name> -b fix/<bug-description>
cd .claude/worktrees/fix-<name>

All work happens in the worktree — main stays clean.

4. TDD Fix

• Write a failing test that reproduces the bug FIRST
• Then implement the fix
• The test must pass after the fix
• Run full test suite to check for regressions

5. Verify

• Run full test suite
• Verify the original bug is fixed
• Check no regressions

6. Code Review

• Self-review via git diff main...HEAD
• Or dispatch a code-review subagent if available
• Fix all issues found before proceeding

7. Create PR

• Commit with message explaining the root cause
• Push branch and create PR via gh pr create
• Return the PR URL
• DO NOT merge — wait for explicit approval

8. Merge (only when approved)

• gh pr merge <number> --merge
• Clean up worktree: cd <project-root> && git worktree remove .claude/worktrees/fix-<name>
• git checkout main && git pull && git branch -d fix/<bug-description>

Rules

• Never merge without explicit approval
• Never push directly to main
• Always write a regression test — the bug must never come back
• No plan needed — bugs are urgent, go straight to debugging
• If 3+ fix attempts fail, stop and question the architecture
• No dead code, no silent excepts, no string literals for constants

Quality Checklist

Before every PR, answer each item and present as a markdown table:

#	Check	Answer
1	What changed — what was fixed and how	[brief]
2	Root cause fix — does this fix the root cause, or just the symptom?	[yes/no + evidence]
3	Single source of truth — no duplicate data paths or redundant caches introduced?	[yes/no + evidence]
4	Test regression — do all existing tests pass?	[pass count / fail count]
5	Reuse — did you reuse existing patterns/functions, or reinvent something?	[yes/no + evidence]

• If any answer is unsatisfactory, fix it before creating the PR
• Be honest — don't beautify answers