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MCP Openapi Proxy logo

MCP Openapi Proxy

matthewhand/mcp-openapi-proxy

mcp-openapi-proxy is a Python package that implements a Model Context Protocol (MCP) server, designed to dynamically expose REST APIs—defined by OpenAPI specifications—as MCP tools. This facilitates seamless integration of OpenAPI-described APIs into MCP-based workflows.

View on GitHub45

Install

uvx mcp-openapi-proxy

Client configuration

{
  "mcpServers": {
    "mcp-openapi-proxy": {
      "command": "uvx",
      "args": [
        "mcp-openapi-proxy"
      ],
      "env": {
        "OPENAPI_SPEC_URL": "<OPENAPI_SPEC_URL>",
        "API_KEY": "<API_KEY>"
      }
    }
  }
}

Environment variables

OPENAPI_SPEC_URLAPI_KEYTOOL_WHITELISTSTRIP_PARAMTOOL_NAME_PREFIXAPI_AUTH_TYPEEXTRA_HEADERSOPENAPI_SPEC_FORMATSERVER_URL_OVERRIDEIGNORE_SSL_TOOLSASANA_API_KEYBOX_API_KEY
GitHub stars
45
Author
@matthewhand
Category
Developer Tools, Cloud Platform
License
MIT
Updated
Oct 6, 2026

About MCP Openapi Proxy

2026-09-05 — 0.4.0: MCP 2.x / 2026-07-28 native Streamable HTTP (stateless POST /mcp, dual-stack with legacy stdio).

Features

  • Dynamic Tool Generation: Automatically creates MCP tools from OpenAPI endpoint definitions.

  • Tool Annotations: Every OpenAPI-derived tool includes MCP annotations (title, plus readOnlyHint / idempotentHint for GET and clearly read-ish POST, or destructiveHint for other methods) so clients…

  • Simple Mode Option: Offers a static configuration alternative via FastMCP mode.

  • OpenAPI Specification Support: Compatible with OpenAPI v3 with potential support for v2.

  • Flexible Filtering: Allows endpoint filtering through whitelisting by paths or other criteria.

  • Payload Authentication: Supports custom authentication via JMESPath expressions (e.g. for APIs like Slack that expect tokens in the payload not the HTTP header).

  • Header Authentication: Uses Bearer by default for API_KEY in the Authorization header, customizable for APIs like Fly.io requiring Api-Key.

  • MCP Integration: Seamlessly integrates with MCP ecosystems for invoking REST APIs as tools.

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

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