A2A directory

Measured A2A repositories

1. agent-registry

   Public registry for all agents

   Origin

   github

   Language

   Go

2. patchcrew

   Persistent collaboration for independent coding agents over A2A and MCP.

   Origin

   github

   Language

   Python

3. mcpcheck

   Protocol conformance testing and runtime monitors for MCP and A2A agents. Checks message ordering, not just schemas — and generates the monitor from the same model.

   Origin

   github

   Language

   Python

4. deepbrief-lab

   Build Your Own Deep Research — a 9-notebook student lab covering MCP, A2A, multi-agent, and HITL agent patterns

   Origin

   github

   Language

   Python