What problem does it solve? Turning an approved technical plan into working code requires disciplined execution: reading the full plan, tracking progress across phases, verifying each step, and handling mismatches between the plan and the actual codebase. This Skill operationalizes that process so plans stored in thoughts/shared/plans are implemented completely and consistently. ## Core Features & Use Cases - Plan-Driven Implementation: Reads a plan file from thoughts/shared/plans, checks existing checkmarks, and implements each phase in order. - Verification Loop: Runs the plan's success criteria (such as make check test) after each phase and checks off completed items directly in the plan file. - Mismatch Handling: Stops and presents a structured issue report (expected vs. found) when reality diverges from the plan, and supports resuming from the first unchecked item. - Use Case: After a planning stage produces thoughts/shared/plans/add-auth.md, invoke this Skill to implement all phases consecutively, updating checkboxes as work completes. ## Quick Start Ask the agent to run ff_implement_plan on the plan file at thoughts/shared/plans/your-plan.md and implement all remaining phases.