A2UI Atomic Catalog — API Docs & Reference

Developer & Agent Documentation

Predictable entry point for developer resources and API reference documents.

Primary integration surface: the MCP server at /mcp — no API key, no signup, POST JSON-RPC 2.0 directly.

• API Documentation — complete endpoint and protocol reference
• OpenAPI 3.1 Specification — raw JSON OpenAPI contract
• Developers Guide — human integration guide
• llms.txt — LLM overview and quick links
• spec.json — 501 atom definitions and field contracts
• Authentication Guide and Rate Limits
• Webhooks & Events — real-time event streaming and delivery patterns