mcp-openapi
Turn any OpenAPI spec into MCP tools for Claude — zero config, instant API access.
Point mcp-openapi-runner at any OpenAPI 3.x spec and Claude can call every endpoint through natural language. No custom integration code. No manual tool definitions. One line of config.
Why mcp-openapi?
| Without mcp-openapi | With mcp-openapi |
|---|---|
| Write custom MCP server per API | One config line per API |
| Define tool schemas manually | Auto-generated from OpenAPI spec |
| Handle auth, params, body yourself | Built-in auth + parameter handling |
| Maintain code as API evolves | Spec changes = tools update automatically |
Quick start
Add to your Claude Desktop / Claude Code / Cursor / Cline MCP config:
{
"mcpServers": {
"petstore": {
"command": "npx",
"args": ["-y", "mcp-openapi-runner", "--spec", "https://petstore3.swagger.io/api/v3/openapi.json"]
}
}
}That's it. Claude can now discover and call every endpoint in that API.
