A2UI Atomic Catalog — API Documentation

Developer & Agent Documentation

Developer and API documentation for the A2UI Atomic Catalog. All developer resources are free, unauthenticated, and machine-readable.

`POST /api/render`	Render atom payload to standalone HTML page (50 req/day)
`POST /api/compose`	Natural language prompt → typed atom blocks (20 req/day)
`GET /ask?q=...`	Natural-language search over the atom catalog (60 req/day)
`GET /api/data/{source}`	Declared data source proxy (data-sources.yaml)
`GET /spec.json`	Full atom vocabulary (573 atoms) with all field contracts
`GET /catalogue/atoms-json-schema.json`	Strict JSON Schema for constrained agent decoding
`GET /catalogue/index.json`	Compact catalog selection menu

Product MCP Server: https://a2uicatalog.ai/mcp — tools for composing, rendering, and publishing UI atoms.
Documentation MCP Server: https://a2uicatalog.ai/mcp-docs — tools (search_docs, list_docs) for querying documentation.

OpenAPI 3.1 Specification — complete machine-readable OpenAPI spec
Developers Guide — integration walkthrough and deployment guide
SDKs & Client Libraries — npm CLI/MCP package, Python A2A tools, and SDK generators
llms.txt and docs/llms.txt — LLM-friendly context documents
agents.md — agent guide with tool contracts and invocation examples
Authentication Guide — auth requirements and OAuth metadata
SDK Documentation — SDKs and client packages
Auth & Rate Limits — real rate limits per tool and endpoint
Pricing & Limits — free tier terms and self-hosting runbooks
Versioning Policy — API versioning (X-API-Version) and deprecation rules
RFC 9727 API Catalog — linkset of all API surfaces
ARD Discovery Catalog — AI Resource Discovery index