What problem does it solve? Plans written for autonomous execution often contain hidden flaws—missing tasks, circular dependencies, or oversized scope—that only surface as failures mid-execution. This Skill catches those problems before execution begins, acting as a quality gate between planning and execution. ## Core Features & Use Cases - Six-Dimension Validation: Checks requirement coverage, task completeness, dependency correctness, key links between artifacts, scope sanity, and verification derivation. - Structured Issue Reporting: Outputs issues in YAML format with severity levels (blocker, warning, info), affected plan/task, and concrete fix hints. - Dependency Graph Analysis: Parses depends_on frontmatter across plans to detect cycles, missing references, and incorrect wave assignments. - Use Case: After running a planning phase that generates PLAN.md files for a multi-phase roadmap, run this checker to confirm every requirement has covering tasks and no circular dependencies exist before starting execution. ## Quick Start Validate all PLAN.md files in the current phase against the roadmap and report any blockers or warnings before execution.