A2A — Agent2Agent Protocol

Google & Linux Foundation's open standard for agent-to-agent communication (v1.0 GA).

Google & Linux Foundation's open standard for how agents talk to other agents. Defines an agent card schema (name, skills, transports, security) and the JSONRPC / gRPC / HTTP+JSON transport options. Most agents declare A2A as a baseline communication protocol and layer commerce protocols on top.

Cross-vendor agent interop: AstraSync injects ASTRA / ASTRAE identifiers into the A2A metadata block so receivers can verify provenance.

You declare: agent URL, version, skills (≥1), transport, optional provider info and security schemes.

What you get: the verification gateway endpoint pre-fills the agent URL automatically when both target the same server.