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OpenAPI Specification

openapi: 3.2.0
info:
  title: Sandwich Public MCP API
  version: 1.0.0
  summary: Public care-directory MCP, markdown negotiation, and discovery for joinsandwich.com.
  description: Machine-readable API for the Sandwich marketing and directory site (www.joinsandwich.com). The public MCP is read-only and requires no auth. Private Care Circle tools and OAuth 2.0 live on inbox.lovedone.app (see /.well-known/oauth-authorization-server).
  contact:
    name: Sandwich
    email: hello@joinsandwich.com
    url: https://www.joinsandwich.com/agents
  license:
    name: Proprietary
    url: https://www.joinsandwich.com/terms
servers:
- url: https://www.joinsandwich.com
  description: Production (canonical www host)
- url: https://joinsandwich.com
  description: Apex host (redirects to www)
tags:
- name: MCP
  description: Public Model Context Protocol endpoint.
paths:
  /api/mcp:
    get:
      tags:
      - MCP
      operationId: getPublicMcpMetadata
      summary: Public MCP server metadata and tool list
      responses:
        '200':
          description: MCP endpoint description
          content:
            application/json:
              schema:
                type: object
    post:
      tags:
      - MCP
      operationId: postPublicMcp
      summary: JSON-RPC 2.0 MCP call (streamable HTTP)
      description: 'Public read-only MCP. No authentication. Methods: initialize, ping, tools/list, tools/call, notifications/initialized. Tools: search_care_resources, get_channel, calculate_long_term_care_cost.'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/JsonRpcRequest'
            examples:
              toolsList:
                value:
                  jsonrpc: '2.0'
                  id: 1
                  method: tools/list
              search:
                value:
                  jsonrpc: '2.0'
                  id: 2
                  method: tools/call
                  params:
                    name: search_care_resources
                    arguments:
                      query: medicaid look-back
                      limit: 5
      responses:
        '200':
          description: JSON-RPC success or protocol-level error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/JsonRpcResponse'
        '204':
          description: notifications/initialized acknowledged
        '400':
          description: Invalid JSON-RPC envelope
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/JsonRpcResponse'
components:
  schemas:
    JsonRpcRequest:
      type: object
      required:
      - jsonrpc
      - method
      properties:
        jsonrpc:
          type: string
          enum:
          - '2.0'
        id:
          oneOf:
          - type: string
          - type: number
          - type: 'null'
        method:
          type: string
        params:
          type: object
          additionalProperties: true
    JsonRpcResponse:
      type: object
      required:
      - jsonrpc
      properties:
        jsonrpc:
          type: string
          enum:
          - '2.0'
        id:
          oneOf:
          - type: string
          - type: number
          - type: 'null'
        result:
          type: object
          additionalProperties: true
        error:
          type: object
          properties:
            code:
              type: integer
            message:
              type: string
            data:
              type: object
              properties:
                hint:
                  type: string
              additionalProperties: true
  securitySchemes:
    firebaseBearer:
      type: http
      scheme: bearer
      bearerFormat: Firebase ID token
      description: Firebase ID token from a signed-in Sandwich user.