This MCP-OpenAPI server allows you to expose HTTP methods from an OpenAPI specification as tools that can be used by LLMs through the Model Context Protocol (MCP). It acts as a bridge between LLMs and existing APIs defined by OpenAPI specs.
You can install the MCP-OpenAPI server from PyPI:
pip install mcp-openapi
The server requires uvx to run.
There are two ways to run the MCP-OpenAPI server: using SSE (Server-Sent Events) or stdio mode.
Start the server by specifying an OpenAPI URL and the mode:
uvx mcp-openapi --openapi-url https://httpbin.org/spec.json sse
or
uvx mcp-openapi --openapi-url https://httpbin.org/spec.json stdio
You can configure the server using command-line arguments or environment variables:
OpenAPI URL:
--openapi-url=URL
MCP_OPENAPI_URL
SSE Mode Configuration:
--fastmcp-sse-host
- the host to serve the MCP server on--fastmcp-sse-port
- the port to serve the MCP server onGlobal Options:
--fastmcp-debug
- enable debug mode for the MCP server--fastmcp-log-level
- the log level for the MCP serverThese can also be configured via environment variables using the FASTMCP_
prefix, e.g., FASTMCP_LOG_LEVEL=DEBUG
.
Here's an example of how to integrate the MCP-OpenAPI server with Claude:
{
"mcpServers": {
"todos": {
"command": "uvx",
"args": [
"mcp-openapi",
"--openapi-url=http://localhost:8000/openapi.json",
"stdio"
]
}
}
}
MCP-OpenAPI can use a global auth token when making requests to the target API:
uvx mcp-openapi --openapi-url=URL --auth-token=YOUR_TOKEN stdio
The token will be used as a bearer token or for basic authentication depending on the OpenAPI spec.
MCP-OpenAPI supports:
Both JSON and YAML formats are supported.
To add this MCP server to Claude Code, run this command in your terminal:
claude mcp add-json "todos" '{"command":"uvx","args":["mcp-openapi","--openapi-url=http://localhost:8000/openapi.json","stdio"]}'
See the official Claude Code MCP documentation for more details.
There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json
file so that it is available in all of your projects.
If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json
file.
To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".
When you click that button the ~/.cursor/mcp.json
file will be opened and you can add your server like this:
{
"mcpServers": {
"todos": {
"command": "uvx",
"args": [
"mcp-openapi",
"--openapi-url=http://localhost:8000/openapi.json",
"stdio"
]
}
}
}
To add an MCP server to a project you can create a new .cursor/mcp.json
file or add it to the existing one. This will look exactly the same as the global MCP server example above.
Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.
The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.
You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.
To add this MCP server to Claude Desktop:
1. Find your configuration file:
~/Library/Application Support/Claude/claude_desktop_config.json
%APPDATA%\Claude\claude_desktop_config.json
~/.config/Claude/claude_desktop_config.json
2. Add this to your configuration file:
{
"mcpServers": {
"todos": {
"command": "uvx",
"args": [
"mcp-openapi",
"--openapi-url=http://localhost:8000/openapi.json",
"stdio"
]
}
}
}
3. Restart Claude Desktop for the changes to take effect