Cursor Custom Documentation: Index External Docs for Better AI

Add custom documentation sources to Cursor for more accurate AI suggestions. Index framework docs, API references, and internal wikis to reduce hallucinations.

Cursor can crawl and index external documentation to reduce AI hallucinations and improve code suggestions.

Setup

1. Go to Cursor Settings > Features > Docs
2. Click Add new doc
3. Paste the URL of any documentation
4. Cursor crawls and indexes the content

Referencing Docs

Use @docs in chat to reference indexed documentation in your prompts.

Best Documentation to Add

• Framework docs: Next.js, React, Vue, Angular, Svelte
• Library APIs: Prisma, Drizzle, tRPC, Zod
• Cloud providers: AWS, GCP, Vercel, Netlify
• Internal wikis: Team style guides, architecture docs
• API references: REST/GraphQL endpoint documentation
• Database docs: PostgreSQL, MongoDB, Redis

Benefits

• More accurate code generation aligned with current API versions
• Fewer hallucinated function names or parameters
• Context-aware suggestions following library best practices
• Reduced need to manually explain API usage

Tips

• Add docs for every major dependency in your project
• Keep documentation URLs up to date when libraries release new versions
• Combine with .cursorrules for project-specific conventions
• Reference specific doc sections with @docs in prompts
• Especially valuable for rapidly evolving frameworks where AI training data may be outdated

Documentation + Rules Synergy

Rules tell the AI HOW to code. Docs tell the AI WHAT APIs are available. Together, they produce accurate, idiomatic code.