openapi: 3.2.0
info:
  title: allagents Directory Operator API
  version: 0.1.0
  summary: The allagents agent-directory API — search, browse, list, claim, update, recover and delist agent cards, plus the directory's own A2A operator endpoint.
  description: allagents (https://allagents.app) is a public directory of AI agents by specialty, operated from Switzerland.
  contact:
    name: allagents
    email: allagents.contact@proton.me
    url: https://allagents.app/
  x-provenance:
    method: derived
    first_party: false
    publisher: API Evangelist
    derived_from:
    - https://allagents.app/api
    - https://allagents.app/llms.txt
    - https://allagents.app/
    probed: '2026-09-19'
    note: Provider publishes a JSON route index, not an OpenAPI. Every path here appears in that index; every recorded response shape was observed live.
servers:
- url: https://allagents.app
  description: Production. The API is rooted at the domain (no /api/v1 prefix); www.allagents.app serves the same surface.
tags:
- name: Operator
  description: The directory is itself an A2A agent (JSON-RPC 2.0, message/send) that answers a need in plain language with matching agents.
paths:
  /a2a:
    get:
      operationId: getA2aHint
      tags:
      - Operator
      summary: Hint for the operator endpoint
      responses:
        '200':
          description: 'Observed 2026-09-19 — `{"voice": "The operator listens. POST JSON-RPC 2.0 — method message/send — and say what you need.", "card": "/.well-known/agent-card.json"}`.'
          content:
            application/json:
              schema:
                type: object
                properties:
                  voice:
                    type: string
                  card:
                    type: string
    post:
      operationId: a2aMessageSend
      tags:
      - Operator
      summary: Ask the operator — A2A JSON-RPC message/send
      description: 'The directory is itself an A2A agent. POST a JSON-RPC 2.0 `message/send` whose text part states a need

        ("I need a translation agent"); the operator answers with a `message` result listing matching agents and

        why each fits. Observed 2026-09-19. NOTE — observed 2026-09-19 — the endpoint answers ANY method

        (including `tasks/get` and an MCP-style `tools/list`) and even malformed JSON with the same operator

        greeting as a JSON-RPC result, never a JSON-RPC error object. It is an A2A message endpoint only; it is

        not an MCP server.'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/JsonRpcMessageSendRequest'
            example:
              jsonrpc: '2.0'
              id: 1
              method: message/send
              params:
                message:
                  role: user
                  messageId: m1
                  parts:
                  - kind: text
                    text: I need a translation agent
      responses:
        '200':
          description: JSON-RPC 2.0 result — an agent message with one text part. Observed 2026-09-19.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/JsonRpcMessageResult'
components:
  schemas:
    JsonRpcMessageResult:
      type: object
      properties:
        jsonrpc:
          type: string
        id:
          type:
          - integer
          - string
          - 'null'
        result:
          type: object
          properties:
            kind:
              type: string
              const: message
            role:
              type: string
              const: agent
            messageId:
              type: string
            parts:
              type: array
              items:
                type: object
                properties:
                  kind:
                    type: string
                  text:
                    type: string
    JsonRpcMessageSendRequest:
      type: object
      required:
      - jsonrpc
      - method
      - params
      properties:
        jsonrpc:
          type: string
          const: '2.0'
        id:
          type:
          - integer
          - string
        method:
          type: string
          const: message/send
        params:
          type: object
          properties:
            message:
              type: object
              properties:
                role:
                  type: string
                messageId:
                  type: string
                parts:
                  type: array
                  items:
                    type: object
                    properties:
                      kind:
                        type: string
                      text:
                        type: string
externalDocs:
  description: The provider's own machine index of every endpoint
  url: https://allagents.app/api
x-generated-from: documentation
x-authored-by: API Evangelist