DISCOVERY SIGNALS

The signals agents look for

Eight artifacts decide whether an AI agent can find and enumerate an API’s documentation. Adoption across the 395 APIs in the Index, ranked.

  1. AI-crawler-friendly robots.txt86% 339/395
  2. llms.txt51% 203/395
  3. Docs sitemap49% 195/395
  4. llms-full.txt47% 187/395
  5. MCP registry listing30% 120/395
  6. OpenAPI spec17% 68/395
  7. .well-known/mcp.json5% 18/395
  8. AGENTS.md3% 11/395

Which of the eight does your API carry?

Check your API against all eight — free