Agent Discovery

Get the agent card

The A2A standard discovery document. Any client that knows the agent's base URL can GET this to learn the agent's DID, capabilities, published skills, and where to send requests.

OPTIONS and HEAD are also accepted — useful for CORS preflight and liveness probes respectively.

get/.well-known/agent.json

Response

Agent card

namestring required

descriptionstring

versionstring required

Agent's own version string.

protocolVersionstring required

A2A protocol version the agent speaks.

didstring required

urlstring uri required

Canonical URL where the agent serves requests.

documentationUrlstring uri

defaultInputModesstring[]

defaultOutputModesstring[]

authorstring

tagsstring[]

Changes

Changed in 2 of the 12 revisions of this API.21427

Apr 21, 20268a22dc1800442912See the full diff
- ▲
  removed the required property from the response with the status
  response-required-property-removed
- ▲
  removed the required property from the response with the status
  response-required-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property / from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property // from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ○
  api operation id getAgentCard removed and replaced with
  api-operation-id-removed
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property / to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property // to the response with the status
  response-optional-property-added
- ○
  added the optional property // to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  the response property became required for the status
  response-property-became-required
- ○
  the response property became required for the status
  response-property-became-required
- ○
  added the required property to the response with the status
  response-required-property-added
- ○
  added the required property // to the response with the status
  response-required-property-added
This revision also has 21 changes that name no endpoint, such as unreferenced schemas being removed. See the revision's changelog
Feb 12, 2026970d68a5c55d515See the full diff
- ●
  removed the optional property / from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property from the response with the status
  response-optional-property-removed
- ●
  removed the optional property // from the response with the status
  response-optional-property-removed
- ●
  removed the optional property // from the response with the status
  response-optional-property-removed
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property / to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property // to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the optional property to the response with the status
  response-optional-property-added
- ○
  added the required property to the response with the status
  response-required-property-added
- ○
  added the required property to the response with the status
  response-required-property-added
- ○
  added the required property to the response with the status
  response-required-property-added

Full history