Agent Card
A JSON document an A2A agent publishes at /.well-known/agent-card.json that advertises its identity, skills, endpoints and authentication.
- term
- Agent Card
- category
- identity
- short_def
- A JSON document an A2A agent publishes at /.well-known/agent-card.json that advertises its identity, skills, endpoints and authentication.
- long_def
- The Agent Card is A2A's discovery primitive — a machine-readable 'business card' hosted at a well-known URI (per RFC 8615) listing the agent's name, description, version, service endpoints, supported interfaces, capabilities (e.g. streaming) and the AgentSkill objects it offers. A client reads the card to decide whether and how to delegate a task to the agent.
- see_also
a2aagent-identityagntcy- etymology_origin
- Defined by the Agent2Agent (A2A) protocol; served at the well-known URI /.well-known/agent-card.json following RFC 8615 'Well-Known Uniform Resource Identifiers'.
- related_to
a2aagent-identityagntcyweb-bot-auth- contrast_with
- Unlike llms.txt or AGENTS.md, which describe a site or repository for ingestion, an Agent Card describes a callable AGENT — its skills, endpoints and auth — so other agents can discover and delegate work to it.
- example
- An A2A agent publishes its Agent Card at /.well-known/agent-card.json, listing skills and endpoints so client agents can discover and delegate to it.
- source
- https://a2a-protocol.org/dev/topics/agent-discovery/
- status
- active
- why_it_matters
- The Agent Card is how a service makes itself discoverable and delegable in a multi-agent system; publishing one is the A2A counterpart of having a sitemap for agents.
- sameAs
- —
- bridge_entity
- protocols/interop/a2a
- last_verified
- 2026-06-15
- md_twin
- /glossary/agent-card.md