openapi: 3.2.0
info:
  title: Agentic Resource Discovery Registry Agents API
  version: 0.5.0
  description: 'Universal federated discovery API specification for AI agents, tools, and capabilities.

    Allows LLM orchestrators to semantically search and discover registries for relevant capabilities

    and enables registry-to-registry federated query routing.

    '
tags:
- name: Agents
paths:
  /agents:
    get:
      summary: Browse Catalog Entries
      description: 'Deterministic, highly cacheable listing endpoint designed for developer portals.

        Relies on strict EBNF database filtering instead of natural language search.

        '
      operationId: listAgents
      parameters:
      - name: filter
        in: query
        required: false
        description: EBNF-like filter expression (e.g., "type = 'application/mcp-server-card+json' AND createdAfter > '2026-01-01'")
        schema:
          type: string
      - name: orderBy
        in: query
        required: false
        description: Field and sorting direction (e.g., "displayName", "updatedAt DESC")
        schema:
          type: string
      - name: pageSize
        in: query
        required: false
        description: Maximum number of entries to return.
        schema:
          type: integer
          default: 20
          maximum: 100
      - name: pageToken
        in: query
        required: false
        description: Token for pagination.
        schema:
          type: string
      responses:
        '200':
          description: Successful deterministic list operation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListResponse'
        '400':
          $ref: '#/components/responses/400BadRequest'
        '401':
          $ref: '#/components/responses/401Unauthorized'
        '429':
          $ref: '#/components/responses/429TooManyRequests'
        '500':
          $ref: '#/components/responses/500InternalError'
      tags:
      - Agents
components:
  responses:
    500InternalError:
      description: Internal server error.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    401Unauthorized:
      description: Credentials missing or rejected.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    429TooManyRequests:
      description: Rate limit exceeded.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    400BadRequest:
      description: Malformed request payload or invalid syntax.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    ListResponse:
      type: object
      required:
      - items
      properties:
        items:
          type: array
          items:
            $ref: ./ai-catalog.schema.json#/$defs/catalogEntry
        total:
          type: integer
          description: Total count of matching entries in the registry.
        pageToken:
          type: string
          description: Token for paginating subsequent results.
    Error:
      type: object
      required:
      - errorCode
      - message
      properties:
        errorCode:
          type: string
          description: Standard uppercase error classification code.
          example: INVALID_ARGUMENT
        message:
          type: string
          description: Human-readable description explaining the error.
          example: The filter expression syntax 'type = MCP' is invalid. Did you mean 'type = application/mcp-server-card+json'?