AI Agents & Applications · advanced · concept 172 of 187

🤝Agent-to-Agent Protocols (A2A)

A2A is an open protocol, now a Linux Foundation project, that lets one agent delegate work to another as a peer. MCP wires an agent to tools; A2A wires agents to each other, and treats the remote agent as opaque. A server publishes an Agent Card at /.well-known/agent-card.json listing skills, endpoints, transports and security schemes. The common mistake is reading that card as a trust signal. Signing is optional, credentials are arranged out of band, and nothing attests the remote agent is competent or honest.