What problem does it solve? Plans written for AI-assisted execution often contain wrong file paths, missing steps, untested assumptions, and hidden breaking changes. This Skill runs a structured two-layer validation fan-out over a plan file so defects are caught and fixed before execution begins, producing a single net gate verdict. ## Core Features & Use Cases - Layer 1 dimension agents: Four always-on parallel checks covering infra/setup fit, test coverage, breaking changes, and security surface, each returning PASS, CONCERN, or FAIL with findings. - Layer 2 per-section feasibility agents: One agent per plan section answering four questions on mechanical feasibility, plan gaps, conflicts, and highest-risk edits, with a probe-emission rule for untestable runtime behaviors. - Net gate synthesis: Aggregates all verdicts into PASS, CONDITIONAL, or BLOCKED, generates proposed plan updates, execute-agent instructions, backlog artifacts, and a validate-contract that hands off to execution. - Use Case: Before executing a multi-package refactor plan, run the validate fan-out to discover that a listed file path is wrong and two downstream consumers are missing from the blast radius, then apply the fixes to the plan and proceed under a CONDITIONAL gate. ## Quick Start Run the validate fan-out on the plan file at process/features/my-feature/active/plan.md and present the net gate verdict with proposed plan updates.
