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by Leivoo

mcp-openapi-swagger

一个基于 NodeJS 的 MCP Server:输入 OpenAPI JSON URL 或 Swagger UI URL,自动抓取/解析文档并返回接口清单(summary 级),供 Cursor 的提示词继续处理。

你会得到什么

  • 支持两种输入:

    • OpenAPI JSON URL(例如 /openapi.json/v3/api-docs

    • Swagger UI URL(例如 /swagger-ui/index.html),会自动发现其背后的 spec URL

  • 输出:method + path + summary + tags + operationId

安装依赖与构建

npm install
npm run build

构建产物在 dist/,并且已配置 bin,可以被 npx 直接执行。

在 Cursor 配置 MCP(npx 启动本地目录)

项目内已提供示例配置:.cursor/mcp.json

关键配置如下(示例):

{
  "mcpServers": {
    "openapi-swagger": {
      "transport": "stdio",
      "command": "npx",
      "args": ["-y", "E:/API-MCP"],
      "env": {
        "OPENAPI_SOURCE_URL": "https://example.com/v3/api-docs"
      }
    }
  }
}

E:/API-MCP 替换成你本机的项目根目录路径。

你也可以把 OPENAPI_SOURCE_URL 配成 Swagger UI 地址(例如 https://example.com/swagger-ui/index.html)。

工具(Tools)

openapi_setSource

缓存一个文档地址,后续 openapi_listEndpoints 可省略入参。

输入:

{ "sourceUrl": "https://example.com/swagger-ui/index.html" }

openapi_listEndpoints

抓取并解析 OpenAPI,然后返回接口清单(summary 级)。

输入(两种用法二选一):

{ "sourceUrl": "https://example.com/v3/api-docs" }

或(使用已缓存的 source):

{}

如果你在 .cursor/mcp.json 里配置了 OPENAPI_SOURCE_URL,那么第一次调用 openapi_listEndpoints 直接传 {} 就能生效。

输出示例:

{
  "ok": true,
  "source": {
    "inputUrl": "https://example.com/swagger-ui/index.html",
    "resolvedSpecUrl": "https://example.com/v3/api-docs",
    "openapiVersion": "3.0.3"
  },
  "endpoints": [
    {
      "method": "GET",
      "path": "/pets/{id}",
      "operationId": "getPetById",
      "summary": "Get a pet",
      "tags": ["pets"]
    }
  ]
}

失败时输出示例(便于提示词分支处理):

{
  "ok": false,
  "stage": "fetch/parse/extract",
  "inputUrl": "https://example.com/swagger-ui/index.html",
  "details": {
    "name": "Error",
    "message": "Failed to discover spec URL from Swagger UI page"
  }
}

运行/调试

npm run dev

如果你要验证 npx 启动(Cursor 同款):

npx -y E:/API-MCP
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