openapi: 3.2.0
info:
  title: Agentic Resource Discovery Registry Explore 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: Explore
paths:
  /explore:
    post:
      summary: Dynamic Registry Introspection
      description: "Aggregates statistical facets and bucketing over the matched search space. \nReturns counts instead of ranked catalog entries. \n"
      operationId: exploreRegistry
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ExploreRequest'
      responses:
        '200':
          description: Successful explore operation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ExploreResponse'
        '400':
          $ref: '#/components/responses/400BadRequest'
        '401':
          $ref: '#/components/responses/401Unauthorized'
        '429':
          $ref: '#/components/responses/429TooManyRequests'
        '501':
          description: Dynamic registry exploration is not implemented by this server.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          $ref: '#/components/responses/500InternalError'
      tags:
      - Explore
components:
  schemas:
    ExploreFacetBucket:
      type: object
      required:
      - value
      - count
      properties:
        value:
          type: string
        count:
          type: integer
      additionalProperties: false
    ExploreRequest:
      type: object
      required:
      - resultType
      properties:
        query:
          $ref: '#/components/schemas/QueryModel'
        resultType:
          type: object
          required:
          - facets
          properties:
            facets:
              type: array
              items:
                $ref: '#/components/schemas/ExploreFacetRequest'
      additionalProperties: false
    ExploreResponse:
      type: object
      required:
      - resultType
      - facets
      properties:
        resultType:
          type: string
          enum:
          - facets
        facets:
          type: object
          additionalProperties:
            $ref: '#/components/schemas/ExploreFacetResult'
      additionalProperties: false
    QueryModel:
      type: object
      properties:
        text:
          type: string
          description: Natural language description narrows the set by semantic relevance.
          example: find me a weather lookup tool
        filter:
          type: object
          description: "Structured constraints. Keys are field paths (can be dot-separated for nested fields). \nValues are arrays or scalar values.\n"
          additionalProperties:
            oneOf:
            - type: string
            - type: array
              items:
                type: string
          example:
            type:
            - application/mcp-server-card+json
            trustManifest.attestations.type:
            - SOC2-Type2
      additionalProperties: false
    ExploreFacetRequest:
      type: object
      required:
      - field
      properties:
        field:
          type: string
          description: Dot-separated path of the catalogEntry property to aggregate.
          example: type
        limit:
          type: integer
          default: 20
        minCount:
          type: integer
          default: 1
      additionalProperties: false
    ExploreFacetResult:
      type: object
      required:
      - buckets
      properties:
        buckets:
          type: array
          items:
            $ref: '#/components/schemas/ExploreFacetBucket'
        otherCount:
          type: integer
      additionalProperties: false
    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'?
  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'