Specrun

Specrun is an open-source MCP server that automatically converts OpenAPI specification files into tools accessible via the Model Context Protocol (MCP). By scanning a designated folder for OpenAPI 3.x or Swagger 2.0 specs, it exposes each API's endpoints as callable tools for use in MCP-compatible assistants (such as Claude, Cursor, etc.). These generated tools allow structured, authenticated interaction with any OpenAPI-described API, with features like dynamic authentication, batch tool execution, live .env updates, and built-in prompts for tool discovery, input generation, and schema explanation. Best suited for developers, technical teams, and organizations looking to quickly integrate diverse APIs into their AI automations or agents via standardized MCP interfaces.