Reference

The reference section is the implementation entry point. Use it when you already understand the protocol model and need exact surfaces: HTTP paths, MCP tools, interoperability status, SDK calls, and generated artifacts.

OpenAPI 3.1 contract, live endpoint, and committed snapshot.

REST API

Streamable HTTP transport and tool surface.

MCP

Legacy experimental endpoint, current compatibility limits, and migration target.

A2A integration status

@grp-protocol/sdk client, examples, and receipt verification helpers.

TypeScript SDK

Version

The current beta protocol version is grp/0.1. Pin integrations to the published OpenAPI snapshot or a tagged release once v0.1.0 is cut.

Source of Truth

The REST contract is the OpenAPI document. The SDK examples are typechecked. Conformance profiles test the same lifecycle through REST and MCP, so the reference pages should read as one operation surface rather than four separate products.