What problem does it solve? Code reviews and unit tests often miss whether a changed backend route actually behaves correctly at runtime. This Skill verifies modified routes and handlers by sending targeted HTTP requests against a live service, confirming status codes, response shapes, validation, and edge cases tied directly to the diff. ## Core Features & Use Cases - Diff-Driven Test Design: Inspects the actual code diff first, then designs requests that exercise exactly the changed behavior rather than generic happy-path checks. - Safe Live Verification: Reuses a healthy running server when available, or starts the service with isolated ports and temporary data stores, never touching production data. - Structured Pass/Fail Reporting: Reports what changed, the request used, expected versus actual results, and a clear pass or fail verdict for each behavior change. - Use Case: After modifying an endpoint's query parameter validation, ask the agent to verify the route; it will start the local service if needed, send targeted curl requests covering valid and invalid inputs, and report exactly which checks passed or failed. ## Quick Start Verify the backend routes I just changed by running targeted requests against the local service and report pass or fail for each behavior change.