# Agent Card

> A machine-readable A2A document that describes an agent's identity, capabilities, interfaces, security, and skills.

- Category: Tools & Protocols
- Stage: Emerging
- Also called: A2A AgentCard, Agent discovery card
- Canonical: https://www.joelcsaji.com/ai-dictionary/agent-card

## Plain English

It is a profile page for another agent, but formatted so software can trust and use it.

## Example

A client reads a vendor-pricing agent's Agent Card before deciding whether it can request a quote.

## Why it matters

Agent discovery needs metadata that is inspectable before agents start exchanging work or data.

## Related

- [Agent2Agent](https://www.joelcsaji.com/ai-dictionary/agent2agent)
- [Agent Skill](https://www.joelcsaji.com/ai-dictionary/agent-skill)

## Sources

- [A2A Protocol Specification](https://a2a-protocol.org/latest/specification/)