Lists multiple specific concrete actions: 'executing the full test suite', 'lint and format checks', 'removing temporary scaffolding', and 'writing a structured validation report with command outputs and success-criteria evidence'. Very detailed about what it does.

Clearly answers both what (runs validation phase with test suite, lint/format, scaffolding removal, writes report) AND when (explicit 'Use when...' clause with multiple trigger scenarios like verifying implementation, confirming criteria, wrapping up plans).

Includes natural keywords users would say: 'verify', 'completed implementation', 'success criteria', 'wrap up a plan', 'finalize a feature or fix', 'sign off', 'closing it out'. Good coverage of natural language variations.

Clear niche as the 'final validation phase' skill with distinct triggers around plan completion and sign-off. The specific mention of writing to 'context/plans/{plan_name}.md' and focus on 'success-criteria evidence' makes it unlikely to conflict with general testing or linting skills.

The content is lean and efficient, with no unnecessary explanations of concepts Claude already knows. Every section serves a clear purpose and the language is direct without padding.

Provides concrete, specific guidance with real command examples (pytest, npm test, eslint --fix, ruff --fix), specific file paths to check, and a complete example report entry that's copy-paste ready.

Clear numbered checklist with explicit validation steps, includes feedback loops for failures (fix -> re-run -> update report), and distinguishes between fixable vs non-trivial failures with specific escalation guidance.

Well-organized with clear sections (When to use, Validation checklist, If checks fail, Validation report). Content is appropriately sized for a single file with no need for external references, and the example report is properly nested under its section.