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+---
+name: documentation
+description: "Generate/update README/API/architecture docs from the actual implementation rather than inventing behavior."
+---
+
+# Documentation Skill
+
+Generate/update README/API/architecture docs from the actual implementation rather than inventing behavior.
+
+## Principles
+
+### Source of Truth
+- Read code first
+- Document what exists
+- Don't speculate on behavior
+
+### Types
+- README: project overview, setup, usage
+- API: public interfaces, parameters, returns
+- Architecture: module boundaries, data flow
+
+### Maintenance
+- Update with code changes
+- Delete stale documentation
+- Link to code references
+\ No newline at end of file