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OpenAPI Specification

openapi: 3.2.0
info:
  title: Fine Structure MCP API
  version: 1.0.0
  summary: Build, edit, validate and publish complete web applications with AI.
  description: 'Fine Structure is an AI software-building platform: it generates complete applications, runs autonomous AI agent teams, and maintains a business brain over your data.


    Getting started is self-serve: sign up free at https://finestructure.ai (free tier included, no credit card), then create an API/MCP token at https://finestructure.ai/api-keys and pass it as `Authorization: Bearer fse2_mcp_`.


    Every operation below is also available as an MCP tool via the JSON-RPC endpoint POST /api/mcp (Streamable HTTP transport).'
  termsOfService: https://finestructure.ai/terms
  contact:
    name: Fine Structure support
    email: support@finestructure.ai
    url: https://finestructure.ai/contact
servers:
- url: https://finestructure.ai
  description: Production
tags:
- name: MCP
  description: Model Context Protocol (JSON-RPC 2.0)
paths:
  /api/mcp:
    post:
      operationId: mcp_jsonrpc
      summary: MCP JSON-RPC 2.0 endpoint (initialize, tools/list, tools/call)
      description: Model Context Protocol endpoint over Streamable HTTP. Supports the methods initialize, tools/list and tools/call per the MCP specification.
      tags:
      - MCP
      security:
      - bearerAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/JsonRpcRequest'
      responses:
        '200':
          description: JSON-RPC 2.0 response (success or error object)
          content:
            application/json:
              schema:
                type: object
components:
  schemas:
    JsonRpcRequest:
      type: object
      properties:
        jsonrpc:
          type: string
          const: '2.0'
        id:
          oneOf:
          - type: string
          - type: integer
          - type: 'null'
        method:
          type: string
          enum:
          - initialize
          - tools/list
          - tools/call
        params:
          type: object
          additionalProperties: true
      required:
      - jsonrpc
      - method
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: fse2_mcp_<token>
      description: User-created Fine Structure token. Create one self-serve at https://finestructure.ai/api-keys. Tokens are scoped by account, app and permissions.
externalDocs:
  description: Agent integration guide
  url: https://finestructure.ai/api/mcp/docs