What problem does it solve? When requirements drift mid-implementation, previously generated code no longer matches the updated PRD. This Skill re-synchronizes code with changed requirements by updating the PRD, re-invoking the Implement Agent, and verifying results with the Check Agent, without restarting the whole task workflow. ## Core Features & Use Cases - Change-aware PRD updates: Appends a structured change log (original requirement, new requirement, reason, impact scope) to prd.md before re-implementation. - Incremental re-implementation: Instructs the Implement Agent to preserve correct existing code and only modify parts affected by the requirement change. - Verification loop: Runs the Check Agent afterward to catch inconsistencies between old and new code, regressions, and lint/typecheck failures. - Use Case: During a Trellis task started with /trellis:start, the product owner changes an acceptance criterion. You update the PRD via this Skill, the Implement Agent adjusts only the affected modules, and the Check Agent confirms nothing regressed. ## Quick Start Ask the AI to run the re-implement workflow for the current Trellis task after describing which requirements in the PRD have changed.
