OpenAPI to MCP Tools
OpenAPI specifications => MCP (Model Context Protocol) tools
What is OpenAPI to MCP Tools?
OpenAPI to MCP Tools is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to openapi specifications => mcp (model context protocol) tools
OpenAPI specifications => MCP (Model Context Protocol) tools
This server falls under the Developer Tools and APIs categories on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- OpenAPI specifications => MCP (Model Context Protocol) tools
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx openapi2mcptoolsConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use OpenAPI to MCP Tools
openapi2mcptools is a TypeScript library and MCP server that automatically converts OpenAPI specifications into Model Context Protocol tools, allowing AI agents to interact with any REST API that has an OpenAPI definition without writing custom integration code. It reads OpenAPI specs, generates typed tool definitions via getToolsList(), and executes API calls via getToolsCaller(), bridging the gap between standard API documentation and AI tool use. API developers and AI engineers use it to rapidly expose existing REST APIs to AI models by pointing it at an OpenAPI spec.
Prerequisites
- Node.js 18 or later installed
- npm or pnpm available in your PATH
- An OpenAPI specification file (JSON or YAML) for the API you want to expose
- An MCP-compatible client such as Claude Desktop or Cursor
Clone the repository
Clone the openapi2mcptools repository to get the source code and example configurations.
git clone https://github.com/2013xile/openapi2mcptools.git
cd openapi2mcptools
npm installBuild the project
Compile the TypeScript source to JavaScript.
npm run buildPoint the converter at your OpenAPI spec
In your server entry point, create a Converter instance with your API's baseURL and load your OpenAPI specification. The converter auto-generates MCP tools from all defined endpoints.
import { Converter } from 'openapi2mcptools';
const converter = new Converter({ baseURL: 'https://api.example.com' });
await converter.load({ /* your OpenAPI spec object */ });
const tools = converter.getToolsList();
const toolCaller = converter.getToolsCaller();Register tools with the MCP server
Wire the generated tools into your MCP server using ListToolsRequestSchema and CallToolRequestSchema handlers, then connect via StdioServerTransport.
server.setRequestHandler(ListToolsRequestSchema, async () => ({
tools: converter.getToolsList()
}));
server.setRequestHandler(CallToolRequestSchema, async (request) => {
const caller = converter.getToolsCaller();
return caller(request.params.name, request.params.arguments);
});Configure your MCP client
Add the built server to your claude_desktop_config.json.
{
"mcpServers": {
"openapi-tools": {
"command": "node",
"args": ["/absolute/path/to/openapi2mcptools/build/index.js"]
}
}
}OpenAPI to MCP Tools Examples
Client configuration
Claude Desktop configuration for the openapi2mcptools server pointing to a local build.
{
"mcpServers": {
"openapi-tools": {
"command": "node",
"args": ["/path/to/openapi2mcptools/build/index.js"]
}
}
}Prompts to try
Example prompts once an OpenAPI-backed MCP server is running.
- "List all available tools generated from the OpenAPI spec."
- "Call the createUser endpoint with name 'Alice' and email '[email protected]'."
- "Search for products using the searchProducts tool with query 'laptop'."
- "What endpoints are available in the loaded API spec?"
- "Execute the getPetById operation with id 42."Troubleshooting OpenAPI to MCP Tools
Converter.load() fails with schema validation errors
Ensure your OpenAPI spec is valid JSON or YAML conforming to OpenAPI 3.0 or 3.1. Validate your spec using the Swagger Editor at editor.swagger.io before loading it.
API calls return CORS or network errors
Set the baseURL in the Converter constructor to your API's correct base URL. For APIs requiring authentication, pass custom headers via the httpClient option when creating the Converter instance.
No tools generated despite a valid spec
Check that your OpenAPI spec's paths contain operationId fields, as openapi2mcptools uses these to name the generated tools. Add operationId to each endpoint if they are missing.
Frequently Asked Questions about OpenAPI to MCP Tools
What is OpenAPI to MCP Tools?
OpenAPI to MCP Tools is a Model Context Protocol (MCP) server that openapi specifications => mcp (model context protocol) tools It connects AI assistants to external tools and data sources through a standardized interface.
How do I install OpenAPI to MCP Tools?
Follow the installation instructions on the OpenAPI to MCP Tools GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with OpenAPI to MCP Tools?
OpenAPI to MCP Tools works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is OpenAPI to MCP Tools free to use?
Yes, OpenAPI to MCP Tools is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
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