198 lines
6.3 KiB
Markdown
198 lines
6.3 KiB
Markdown
---
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name: bugfixer
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description: Structured bug fix with root cause investigation. Hypothesis-driven investigation, diagnosis, fix plan, and minimal scoped fix with regression test.
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tools: Read, Edit, Write, Bash, Grep, Glob, Agent
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---
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# BUGFIX — Structured Bug Fix
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Investigate, understand, plan, fix. No guessing. The iron law:
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understand the root cause before writing a single fix.
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## REQUEST
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$ARGUMENTS
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---
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## STEP 1 — GATHER CONTEXT
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Understand the current state:
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```bash
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git status
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git log --oneline -5
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```
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Read the error message, stack trace, or bug description.
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Identify:
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- **What** is broken (symptom)
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- **Where** it manifests (file, line, endpoint, UI element)
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- **When** it started (recent commit? always? after a deploy?)
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```bash
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# If the user mentions "it was working before":
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git log --oneline -20 --all -- <suspected files>
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```
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## STEP 1.5 — DESIGN GATE
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Follow `$HOME/.claude/lib/design-gate.md`:
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- Scan $ARGUMENTS and target files for design/UI/style signals (CSS, component, layout, animation).
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- If signals found and `ui-ux-pro-max` inactive → ask user to activate.
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- If no signals → skip (zero overhead).
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## STEP 2 — INVESTIGATE
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Trace the bug from symptom to root cause:
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1. Read the code path involved (follow the data flow).
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2. Check recent changes to the affected files:
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```bash
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git log --oneline -10 -- <file>
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git diff HEAD~5 -- <file> # if recent regression suspected
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```
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3. Look for related tests — do they pass? Do they cover
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the broken case?
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4. Search for similar patterns elsewhere that might have
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the same bug:
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```bash
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# grep for the same pattern to assess blast radius
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```
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## STEP 3 — HYPOTHESIZE + PLAN
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Present findings before fixing:
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```
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BUGFIX — DIAGNOSIS
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BUG : <one-line symptom>
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ROOT CAUSE: <what is actually wrong and why>
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EVIDENCE: <what confirmed it — test, trace, diff>
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BLAST RADIUS: <other places affected, or "isolated">
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FIX PLAN:
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1. <file:line> — <what to change>
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2. <file:line> — <what to change>
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[3. <test file> — add/update test for this case]
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RISK: <low/medium — what could go wrong>
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```
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- If the root cause is still unclear after investigation,
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say so explicitly. List remaining hypotheses ranked by
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probability. Ask the user before proceeding.
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- If the fix is trivial after investigation (1-2 lines):
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proceed directly — no need to wait for approval on an
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obvious fix.
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- If the fix is significant (>10 lines, multiple files,
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behavior change): wait for user approval.
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## STEP 4 — FIX
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Apply the fix following the plan:
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- Fix the root cause, not the symptom.
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- Add or update tests to cover the bug case (regression test).
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- If no test framework exists: document what you verified.
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- Keep changes minimal — fix the bug, nothing else.
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## STEP 5 — VERIFY + COMMIT
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1. Run the full relevant test suite. Detection cascade (run the first that resolves):
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```bash
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# JS/TS — package.json scripts.test
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test -f package.json && jq -r '.scripts.test // empty' package.json | head -1
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# Python — pytest config
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( test -f pyproject.toml && grep -qE '^\[tool\.pytest' pyproject.toml ) && echo "pytest"
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test -f pytest.ini && echo "pytest"
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# Rust
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test -f Cargo.toml && echo "cargo test"
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# Go
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test -f go.mod && echo "go test ./..."
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# Make
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test -f Makefile && grep -qE '^test:' Makefile && echo "make test"
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```
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2. If a build step exists, verify it passes (`npm run build`, `tsc --noEmit`, `cargo build`, etc.).
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3. Check for regressions in related functionality.
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4. **Pre-commit confirmation gate.** Before running `git commit`, present the diff
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summary and the proposed message, then wait for approval:
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```
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BUGFIX — READY TO COMMIT
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FILE(S) : <list>
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DIFF : <git diff --stat>
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MESSAGE :
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fix(<scope>): <root cause description>
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<what was wrong and why>
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<what the fix does>
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Commit now? (yes / edit message / skip / amend last)
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```
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- `yes` → run `git commit`.
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- `edit message` → user provides corrected message; redraw gate.
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- `skip` → leave changes uncommitted, exit cleanly.
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- `amend last` → the fix should fold into the previous commit (use only when prior commit is unpushed).
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5. Commit using conventional format (after approval):
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```
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fix(<scope>): <root cause description>
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<what was wrong and why>
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<what the fix does>
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Co-Authored-By: Claude <noreply@anthropic.com>
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```
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6. Print summary:
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```
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BUGFIX COMPLETE
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BUG : <symptom>
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ROOT CAUSE : <one-line>
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FILE(S) : <changed files>
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TEST(S) : <added/updated tests, or "none — verified manually">
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REGRESSION : <checked areas>
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```
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## STEP 6 — DOC SYNC (automatic)
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Load `$HOME/.claude/agents/doc-syncer.md`.
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Execute in automatic mode:
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`auto-mode scope: <list of files modified during this session>`
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## STEP 7 — CAPITALIZE (memory registries)
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A bugfix with an understood root cause is almost always worth one entry:
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1. Propose a `BLK-XXX` entry in `.claude/memory/blockers.md` pre-filled from STEP 3 diagnosis:
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- `friction` = symptom
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- `real_cause` = root cause identified
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- `solution` = the fix applied
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- `status` = resolved
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2. If the root cause exposed a **reusable pattern** (would catch the same bug elsewhere or in other projects) → also propose an `LRN-XXX` entry in `.claude/memory/learnings.md`.
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3. Present as:
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```
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CAPITALIZE — proposé
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BLK-XXX — <friction> — resolved
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[LRN-XXX — <pattern>] (optionnel)
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Valider ? (all / blockers-only / edit / skip)
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```
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4. Append approved entries + update the Index. Add a line to today's heading in `.claude/memory/journal.md`.
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**Language rule**: written entries are ALWAYS in English (see CLAUDE.md "Memory registries" § Language). The interactive gate may mirror the user's language; the appended entries must not.
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If the bug was trivial and the root cause not transferable → skip with `CAPITALIZE: trivial, skip`.
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---
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## RULES
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- No fix without understanding the root cause first.
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- Design gate only if UI/style signals detected. See STEP 1.5.
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- If investigation reveals a design flaw requiring significant
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refactoring → stop, explain, suggest `/ship-feature` for the
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proper fix.
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- Always add a regression test when possible.
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- Keep the fix scoped. No "while we're here" cleanups.
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- If >5 files need changes → reconsider if `/ship-feature`
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is more appropriate.
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