Anthropic open-sourced the skills that power Claude's document features. 16 skills.
Most are examples. But 4 of them, PDF, DOCX, PPTX, XLSX, are the actual production code running behind Claude's "create a document" feature.
The 3 worth installing right now:
→ MCP Builder. Step-by-step guide for building Model Context Protocol servers. API research, tool naming, auth patterns, error handling.
→ Webapp Testing. Playwright-based toolkit with a decision tree. Server lifecycle manager. Screenshots, logs, the works.
→ Skill Creator. A skill for building skills. Draft, test, benchmark, optimize tri