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OpenAPI MCP Server

@ivo-toby

リポジトリ

基本情報

カテゴリ

その他

ライセンス

MIT

トランスポート

stdio

作者

ivo-toby

OpenAPI MCP Server について

MCP Server (Model Context Protocol) for turning OpenAPI specifications into a MCP Resource

OpenAPI MCP Server の設定

以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。

{
  "mcpServers": {
    "mcp-openapi-server": {
      "command": "npx",
      "args": [
        "@ivotoby/openapi-mcp-server",
        "\\"
      ]
    }
  }
}

OpenAPI MCP Server のツール

ツール一覧はまだありません

この掲載には表示できるツール一覧がまだありません。サーバーにツールがないという意味ではありません。対応機能はプロジェクトのドキュメントをご確認ください。

上のボタンで一時的なサンドボックスでこのサーバーを実行し、ツール一覧を取得できます。

概要

What is OpenAPI MCP Server?

A Model Context Protocol (MCP) server that exposes OpenAPI endpoints as MCP tools, with optional support for MCP prompts and resources. It enables Large Language Models to discover and interact with REST APIs defined by OpenAPI specifications.

How to use OpenAPI MCP Server?

Use the CLI directly with npx @ivotoby/openapi-mcp-server or import the OpenAPIServer class as a library in your Node.js application. Configure via environment variables (e.g., API_BASE_URL, OPENAPI_SPEC_PATH) or command‑line flags (e.g., --api-base-url, --openapi-spec). Supports both stdio (default) and HTTP transport.

Key features of OpenAPI MCP Server

  • Exposes OpenAPI endpoints as MCP tools automatically
  • Supports loading OpenAPI specs via URL, file, stdin, or inline
  • Two transports: stdio (default) and Streamable HTTP
  • Mutual TLS (mTLS) support for upstream API authentication
  • Tool loading modes: all, dynamic, or explicit
  • Filtering by tags and custom headers

Use cases of OpenAPI MCP Server

  • Connect Claude Desktop to any REST API via OpenAPI spec
  • Allow LLMs to dynamically discover and invoke API actions
  • Provide structured tools for API‑driven autonomous agents
  • Load private APIs using mTLS or custom CA certificates
  • Use with Cursor or any MCP‑compatible client

よくある質問

1

What transport methods does OpenAPI MCP Server support?

Stdio (default) for direct integration with AI systems like Claude Desktop, and Streamable HTTP for web clients and HTTP‑capable systems.

2

How can I load an OpenAPI specification?

Four methods: provide a URL or local file path with `--openapi-spec`, pipe the spec via standard input with `--spec-from-stdin`, pass the spec inline with `--spec-inline`, or use the corresponding environment variables. Only one source is allowed at a time.

3

How do I authenticate to the upstream API?

You can set static headers via `--headers` / `API_HEADERS`, or use mutual TLS with `--client-cert` and `--client-key` options. mTLS is orthogonal to header‑based authentication.

4

What is the default transport and how do I change it?

The default transport is `stdio`. Switch to HTTP by setting `--transport http` (or the `TRANSPORT_TYPE` environment variable). The HTTP server listens on `127.0.0.1:3000` by default.

5

Can I use OpenAPI MCP Server as a library?

Yes. Import the `OpenAPIServer` class in your own Node.js applications for custom implementations, instead of using the CLI tool.

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