What problem does it solve? Turning a clear requirement into working code often leads to oversized diffs, untested changes, and scope creep. This Skill enforces a disciplined test-first loop so every change is small, verified, and keeps the codebase green. ## Core Features & Use Cases - Test-First Loop: Write a failing test that captures the next behavior slice, make it pass with the simplest code, then run the verify command before moving on. - Bounded Changes: Produce the smallest diff that meets the requirement, respect the out_of_scope fence, and match surrounding code style. - Engineer Agent Delegation: Hand off independent bounded work to the engineer agent, or work locally when coordination is needed. - Use Case: Given a scoped specification for a new API endpoint, implement it slice by slice with failing tests first, keeping the test suite green at every step and reporting any material deviations. ## Quick Start Implement the approved specification test-first, delivering small verified changes one slice at a time.