---
type: "Glossary term"
title: "Agent Card"
description: "A2A's machine-readable description of an agent's capabilities."
tags: [glossary]
generated: { by: human:crpage, at: 2026-07-09T09:44:00Z }
aliases: "agent card; agent cards"
status: stable
---

# Definition
A JSON document by which an agent advertises its capabilities for discovery — the [A2A](../standards/a2a.md) mechanism, analogous to a service description for agents.

# Used in this bundle
Appears in: [a2a](../standards/a2a.md), [discovery-and-retrieval](../stack/discovery-and-retrieval.md).

# Related terms
[tool discovery](tool-discovery.md).