---
title: "A2A Agent Card | A2A agent card agent-to-agent discovery | Agent-Ready Check"
description: "An Agent2Agent card publishes your agent's identity, skills and interfaces so other agents can discover and call it. Pass criteria: /.well-known/agent-card.json declares name, version and supported interfaces."
locale: en
canonical: https://agent-ready.t0ols.com/checks/a2a-agent-card/
---

# A2A Agent Card

> Category: API, Auth, MCP & Skill Discovery

An Agent2Agent card publishes your agent's identity, skills and interfaces so other agents can discover and call it.

## Why it matters

Useful when you want to be a participant in multi-agent workflows rather than just a data source.

## Pass criteria

/.well-known/agent-card.json declares name, version and supported interfaces.

## How to implement it

Goal: Publish an A2A Agent Card so other agents can discover this site's agent

/.well-known/agent-card.json declares name, version and supported interfaces.

The step-by-step implementation prompt is part of the paid tier. The free layer gives you the diagnosis, the evidence and the specification links.

Specifications: https://a2a-protocol.org/, https://google.github.io/A2A/
Implementation notes: https://agent-ready.t0ols.com/.well-known/agent-skills/a2a-agent-card/SKILL.md