By name: gate-check description: "Validates phase readiness — checks required deliverables, permits, quality standards, and budget tolerance. Outputs PASS / CONCERNS / FAIL." user-invocable: true allowed-tools: Read, Glob, Grep
When invoked: Check all phase gate criteria — required documents exist, permits obtained, quality standards met, budget within tolerance. Output structured gate check with PASS/CONCERNS/FAIL verdict and list of blocking items.