majiayu000 Better Bug Fix
Follow a test-first debugging workflow that proves the bug and validates the fix.
Workflow
Triage and scope the bug.
- Restate the symptom and expected behavior in one sentence.
- Identify the affected area (files, module, API, UI).
Write a minimal failing test first.
- Add the smallest test that reproduces the bug.
- Prefer existing test frameworks and patterns in the repo.
- If no tests exist, create a minimal repro harness as close as possible to existing structure.
Run tests to confirm failure.
- Execute the narrowest test command that includes the new test.
- Record the failing output or error signature.
Delegate fixes to subagents.
- Spawn 2-3 subagents with clear ownership of investigation/fix ideas.
- Ask each to propose a fix and the rationale, referencing the failing test.
- Keep their scopes non-overlapping (e.g., data flow, edge cases, API contract).
Implement the best fix.
- Apply the most plausible fix based on test and codebase conventions.
- Keep the change minimal and focused on the bug.
Prove the fix.
- Re-run the failing test(s) and any relevant nearby tests.
- Ensure the new test passes and no regressions are introduced.
Report clearly.
- Explain the root cause, the test added, and why the fix works.
- Call out any remaining risks or follow-ups.
Guardrails
- Do not attempt a fix before a reproducing test exists.
- If a test cannot be written, explicitly explain why and propose the closest alternative (repro script or manual steps).
- Avoid refactors unless necessary to make the test feasible.
- Keep changes small; prefer surgical fixes.
Subagent Prompt Template
Use this template when spawning subagents:
"""
You are a subagent investigating a bug. The reproducing test is failing. Please:
- Identify the likely root cause in the code.
- Propose a minimal fix.
- Note any tradeoffs or additional tests to add.
Stay within your assigned scope.
"""