Implement Feature Safely

Goal

Implement the feature with correct behavior, test coverage, and a clean diff that is easy to review.

Rules

• Prefer small, composable changes over sweeping rewrites.
• No silent behavior changes outside the requested scope.
• Add tests that would have caught the bug/absence of feature.

Workflow

1. Locate the correct insertion points (entry points, handlers, services).
2. Add a feature flag/config toggle if risk is non-trivial or rollout is needed.
3. Implement the smallest viable slice first:
   • Plumb inputs
   • Produce correct outputs
   • Handle errors explicitly
4. Add tests in this order:
   • Unit tests for core logic
   • Integration tests for the feature boundary
   • Golden snapshot tests only if appropriate
5. Run the project’s standard checks (tests, lint, typecheck, build).
6. Clean up:
   • Remove dead code