openapi: 3.2.0
info:
  title: LiteLLM A2a Registration API
  description: 'Proxy Server to call 100+ LLMs in the OpenAI format. **Customize Swagger Docs**


    👉 ```LiteLLM Admin Panel on /ui```. Create, Edit Keys with SSO. Having issues? Try ```Fallback Login```


    💸 ```LiteLLM Model Cost Map```.


    🔎 ```LiteLLM Model Hub```. See available models on the proxy. **Docs**'
  version: 1.102.1
tags:
- name: a2a_registration
paths:
  /v1/a2a/discover:
    post:
      description: 'Fetch the upstream agent''s well-known card so the UI can show the admin

        which skills/capabilities the agent exposes.


        Only proxy admins can call this — the UI uses it during agent registration,

        and we don''t want arbitrary keys probing internal URLs.


        Example:

        ```bash

        curl -X POST "http://localhost:4000/v1/a2a/discover" \

        -H "Authorization: Bearer " \

        -H "Content-Type: application/json" \

        -d ''{"url": "https://upstream-agent.example.com"}''

        ```'
      operationId: discover_agent_card_v1_a2a_discover_post
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DiscoverAgentRequest'
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DiscoverAgentResponse'
          description: Successful Response
        '422':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
          description: Validation Error
      security:
      - APIKeyHeader: []
      summary: Discover Agent Card
      tags:
      - a2a_registration
components:
  schemas:
    DiscoveryMode:
      description: 'How to locate the upstream agent card.


        String-valued so it serializes cleanly over JSON / Pydantic.'
      enum:
      - well_known_fallback
      - langgraph_platform
      title: DiscoveryMode
      type: string
    DiscoverAgentRequest:
      properties:
        discovery_mode:
          $ref: '#/components/schemas/DiscoveryMode'
          default: well_known_fallback
          description: How to locate the upstream card. ``well_known_fallback`` for pure A2A agents (try standard paths); ``langgraph_platform`` for LangGraph Platform deployments where the card is shared across assistants and disambiguated by a query parameter.
        params:
          anyOf:
          - additionalProperties: true
            type: object
          - type: 'null'
          description: 'Mode-specific parameters. ``langgraph_platform`` requires ``{''assistant_id'': <id>}``. ``well_known_fallback`` ignores this.'
          title: Params
        url:
          description: 'Base URL of the upstream agent. Behavior depends on ``discovery_mode``: ``well_known_fallback`` (default) tries /.well-known/agent-card.json, /.well-known/agent.json, /agent.json under this URL in order; ``langgraph_platform`` hits ``/.well-known/agent-card.json?assistant_id=<id>`` instead.'
          title: Url
          type: string
      required:
      - url
      title: DiscoverAgentRequest
      type: object
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationError
    DiscoverAgentResponse:
      properties:
        agent_card:
          additionalProperties: true
          title: Agent Card
          type: object
        url:
          title: Url
          type: string
      required:
      - url
      - agent_card
      title: DiscoverAgentResponse
      type: object
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
  securitySchemes:
    APIKeyHeader:
      type: apiKey
      description: Bearer token
      in: header
      name: x-litellm-api-key