UNITONE MCP Builder

What it does

UNITONE MCP Builder turns any REST API into a deployable MCP server without writing code. Paste an OpenAPI/Swagger spec URL, import a Postman collection, or describe your API in plain text — the builder parses the endpoints, lets you select which ones to expose, and generates a fully typed TypeScript MCP server ready to run on stdio transport. An embedded React admin dashboard (served at localhost:5173) lets you manage configs, deploy servers with one click, and monitor running instances.

Built for local development, with enterprise hosting available via UnitOne AI.

Tools

UNITONE MCP Builder is a code-generation tool rather than a tool-exposing MCP server. It generates servers that expose your API endpoints as MCP tools — the tool count per generated server depends on how many endpoints you select (recommended: under 40 for optimal performance).

Key capabilities of the builder:

• OpenAPI/Swagger parser — accepts JSON, YAML, or spec URL; resolves $ref components
• Postman collection importer — parses exported collection JSON
• Plain-text parser — infers endpoints from freeform API documentation
• Code generator — produces a Handlebars-templated TypeScript server using @modelcontextprotocol/sdk v1.20+
• Admin dashboard — React 18 + MUI interface for managing configs and deployments
• One-click deploy — builds and starts generated servers directly from the UI
• Auth support — bearer tokens, API keys, OAuth2 client credentials

Installation

git clone https://github.com/UnitOneAI/MCPBuilder.git
cd MCPBuilder
npm install
npm run dev

Dashboard: http://localhost:5173 · API server: http://localhost:3000

Generated servers output to generated-servers/<name>/. Configure your MCP client to point at the built dist/index.js:

{
  "mcpServers": {
    "my-api": {
      "command": "node",
      "args": ["/absolute/path/to/generated-servers/my-api/dist/index.js"],
      "env": {
        "API_BASE_URL": "https://api.example.com",
        "API_TOKEN": "your_token"
      }
    }
  }
}

Supported hosts

Any MCP client that supports stdio transport — Claude Desktop confirmed in README.