Publish an agent card

How to do it

Serve the agent card JSON with name, description, version, supportedInterfaces, capabilities, input and output modes, and skills. This follows A2A 1.0. Clients send A2A-Version: 1.0, and a missing header means version 0.3. Make SendMessage work on the endpoint the card names.

Example

{
  "name": "Example Co assistant",
  "description": "Answers questions about our services and books calls.",
  "version": "1.0.0",
  "supportedInterfaces": [
    { "url": "https://example.com/a2a", "protocolBinding": "JSONRPC", "protocolVersion": "1.0" }
  ],
  "capabilities": { "streaming": false, "pushNotifications": false },
  "defaultInputModes": ["text/plain"],
  "defaultOutputModes": ["text/plain"],
  "skills": [{ "id": "book-call", "name": "Book a call", "description": "Find a free slot and book it.", "tags": ["booking"] }]
}

How to check

Fetch the card and validate it against the A2A schema. Send a JSON-RPC SendMessage with A2A-Version: 1.0, and get a message or task back.