What problem does it solve? After executing an implementation plan, it is hard to know whether every phase was actually completed, whether automated checks pass, and whether the code deviates from what was specified. This Skill systematically compares the plan against the real implementation and produces a structured validation report. ## Core Features & Use Cases - Context Discovery: Locates the plan, reviews recent git commits and diffs, and reads project state and decision files to reconstruct what was implemented. - Systematic Validation: Checks each plan phase for completion, runs automated verification commands like build, test, and lint, and assesses manual testing criteria. - Validation Report Generation: Produces a Markdown report covering implementation status, automated verification results, deviations, potential issues, and manual testing steps. - Use Case: After finishing a multi-phase feature implementation, run this Skill to confirm all success criteria pass, catch missing error handling or regressions, and document remaining manual test steps before opening a pull request. ## Quick Start Ask the agent to validate the implementation of the current plan against its success criteria and produce a validation report.