MCPO: OpenAPI Proxy for MCP Servers

MCPO (Model Context Protocol to OpenAPI Proxy) is a dead-simple proxy that takes an MCP server command and makes it accessible via standard RESTful OpenAPI. It enables tools to "just work" with LLM agents and applications expecting OpenAPI servers, addressing the integration challenges of stdio-based MCP tools within the broader web ecosystem. Developed by the Open WebUI community, MCPO is an active project, with version 0.0.20 released on February 27, 2026.