Names the domain (implementation validation against specs/design/tasks) and describes the general action, but lacks specific concrete actions like 'compare code to requirements', 'check test coverage', or 'verify API contracts'.

Clearly answers both what ('Validate that implementation matches specs, design, and tasks') and when (explicit 'Trigger:' clause with multiple specific trigger terms).

Excellent coverage of natural trigger terms including 'verify', 'validate', 'check implementation', 'quality gate', plus Spanish variants ('verificar', 'revisar cambio') and a command-style trigger ('/sdd:verify').

The terms 'verify' and 'validate' are fairly generic and could overlap with other validation skills (e.g., data validation, test validation). The 'sdd verify' and '/sdd:verify' triggers help distinguish it, but the core terms remain broad.

The skill is reasonably efficient but includes some redundancy (e.g., the detailed output template could be more condensed, and some explanatory text like 'You are a sub-agent responsible for VERIFICATION' is unnecessary context Claude doesn't need).

Provides highly concrete, executable guidance with specific file paths to check, exact command detection logic, clear classification criteria (COMPLIANT/PARTIAL/NOT COMPLIANT), and detailed output templates that are copy-paste ready.

Excellent multi-step workflow with 7 clearly numbered steps, explicit validation checkpoints (Step 2b automated checks), clear decision trees for each step, and comprehensive error recovery table with specific actions for each situation.

Well-structured with clear references to external files (persistence-contract.md, engram-convention.md, openspec-convention.md) that are one level deep and clearly signaled. Content is appropriately organized into logical sections.