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OpenAPI MCP Server

@3loc

Repository

Basic information

Category

Other

Transports

stdio

Author

3loc

About OpenAPI MCP Server

This is a skeleton project that you can use as a starting point for building your own MCP server. The example addition function demonstrates how to implement handlers across all three protocols.

#openapi#mcp#server

OpenAPI MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "openapi-mcp-server-3loc": {
      "command": "docker",
      "args": [
        "compose",
        "build"
      ]
    }
  }
}

OpenAPI MCP Server tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is OpenAPI MCP Server?

OpenAPI MCP Server is a skeleton project for building your own Model Context Protocol (MCP) server. It includes an example addition function and demonstrates how to implement handlers across all three supported protocols: Standard I/O (stdio), Server-Sent Events (SSE), and OpenAPI/REST endpoints.

How to use OpenAPI MCP Server?

Run the server using Docker or Docker Compose. Set the MODE environment variable to stdio, sse, or openapi to select the transport mode. Launch a specific service (e.g., docker compose up sse-mcp-server) or run directly with Docker (e.g., docker run -i --rm -e MODE=stdio 3loc/openapi-mcp-server). Configure the server using an mcp.json file.

Key features of OpenAPI MCP Server

  • Supports three transport modes: stdio, SSE, and OpenAPI
  • Provides a starting point for building custom MCP servers
  • Includes an example addition function handler
  • Deployable via Docker or Docker Compose
  • Configurable through environment variable MODE
  • Can be used with mcp.json configuration file

Use cases of OpenAPI MCP Server

  • Starting point for developing a new MCP server
  • Testing and prototyping MCP functionality across different transports
  • Demonstrating how to implement MCP handlers for all three protocols
  • Quick local deployment of a basic MCP server using Docker

Frequently asked questions

1

What operating modes does OpenAPI MCP Server support?

It supports three modes: `stdio` (standard I/O), `sse` (Server-Sent Events on port 8001), and `openapi` (OpenAPI/REST on port 8002).

2

How do I run OpenAPI MCP Server in SSE mode?

Use `docker run -p 8001:8000 --rm -e MODE=sse 3loc/openapi-mcp-server` or `docker compose up sse-mcp-server`.

3

How do I configure OpenAPI MCP Server?

Create an `mcp.json` file with the appropriate command/args for stdio mode or a URL for SSE mode. The server reads the `MODE` environment variable to select the transport.

4

What is included as an example in OpenAPI MCP Server?

The server includes an example addition function that demonstrates how to implement handlers across all three protocols.

5

What are the runtime requirements for OpenAPI MCP Server?

The server runs inside a Docker container. The image is `3loc/openapi-mcp-server`. No other dependencies are listed.

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