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The Skill Specification Linter is a specialized quality assurance tool designed to enforce the agentskills.io standard for Claude Code skills. It automatically audits frontmatter fields, directory structures, and content quality rules—such as the prohibition of token-wasting ASCII art and persona statements—to ensure skills are optimized for LLM performance. This tool is essential for developers contributing to marketplaces or maintaining internal skill repositories who need to run automated quality gates and maintain high structural standards.