Write JSDoc comments and inline documentation for Valibot library source code in /library/src/. Use when documenting schemas, actions, methods, or utilities. Covers interface documentation, function overloads, purity annotations, inline comment patterns, and terminology consistency.

Review pull requests and source code changes in /library/src/. Use when reviewing PRs, validating implementation patterns, or checking code quality before merging. Covers code quality checks, type safety, documentation review, test coverage, and common issues to watch for.

Create new API reference pages for the Valibot website at website/src/routes/api/. Use when adding documentation for new schemas, actions, methods, or types. Covers reading source code, creating properties.ts and index.mdx files, updating menu.md, and cross-referencing related APIs.

Update existing API documentation pages after source code changes. Use when syncing docs with library changes like new parameters, type constraint changes, interface updates, or function renames. Covers common change patterns and verification steps.

Create conceptual documentation and tutorial pages for the Valibot website at website/src/routes/guides/. Use when adding guides about schemas, pipelines, async validation, migration, or other topics. Covers directory structure, MDX templates, frontmatter, and content guidelines.