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* feat: add skill-check for agentskills.io spec validation Read-only skill that validates SKILL.md files against the agentskills specification and Anthropic best practices. Catches structural errors, semantic contradictions, naming anti-patterns, and quality gaps. Source: https://github.com/olgasafonova/SkillCheck-Free License: MIT Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * Add ## Overview section per canonical template Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>