Agent Card
A JSON manifest that describes an A2A-compatible agent's capabilities, accepted inputs, and endpoint location, enabling discovery without a central registry.
In the Agent2Agent protocol, every compatible agent publishes an Agent Card, a structured JSON document that functions like a combination of DNS records and API documentation. The card declares what the agent can do, what inputs it accepts, and how to reach it. When one agent needs to find another agent with specific capabilities (like processing expense reports), it queries available Agent Cards looking for that capability. Cards can be hosted anywhere, eliminating the need for a central discovery registry.
Also known as
agent cards, A2A agent card