OpenAPI MCP Server

Name: OpenAPI MCP Server
Author: ivo-toby

@ivo-toby

リポジトリ

OpenAPI MCP Server について

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

基本情報

カテゴリ

その他

ライセンス

MIT

ランタイム

node

トランスポート

stdio

公開者

ivo-toby

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",
        "\\"
      ]
    }
  }
}

ツール

ツールは検出されませんでした

ツールは README から自動的に抽出されます。メンテナーは ## Tools という見出しの下に記載することで、このタブに反映できます。

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

FAQ from OpenAPI MCP Server

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.

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.

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.

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.

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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