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Use the downloadable contracts to generate clients, validate payloads, configure API tools, or index the documentation for an AI system. Each specification is a standalone bundle with no unresolved external references. The HTTP contracts use OpenAPI 3.1.2, shared data models use JSON Schema 2020-12, and multi-step flows use Arazzo 1.1. MCP examples follow the MCP base protocol and tool model. The distribution also provides an RFC 9727 API catalog plus llms.txt and llms-full.txt indexes. Treat those indexes as navigation aids; use OpenAPI, JSON Schema, and MCP discovery for exact field definitions.