mcpo vs openapi-servers
MCP-to-OpenAPI proxy compared with reference tool servers
mcpo proxies existing MCP servers into HTTP endpoints with generated OpenAPI schemas and interactive docs. openapi-servers provides separate FastAPI examples for exposing tools and data through OpenAPI, with optional MCP bridging; the main difference is proxying existing MCP tools versus building or adapting server implementations.
mcpo: Turn MCP Tools into OpenAPI Services
mcpo proxies MCP servers as standard HTTP APIs with generated OpenAPI schemas and interactive docs. It is useful when agents, apps, or teams need to use MCP tools through familiar REST interfaces.
openapi-servers: Build OpenAPI Tool Servers for AI Agents
openapi-servers provides reference FastAPI implementations for exposing external tools and data through standard OpenAPI APIs. It suits developers integrating REST services with LLM agents who want an alternative to a proprietary tool protocol.
| mcpo | openapi-servers | |
|---|---|---|
| Language | Python | Python |
| License | MIT | MIT |
| Stars | 4.4k | 1.1k |
| Forks | 497 | 179 |
| Last analyzed | Oct 3, 2026 | Nov 3, 2026 |
Key differences
- mcpo is a proxy layer that requires an MCP server, while openapi-servers is a collection of reference server implementations.
- mcpo supports command-launched, SSE, and Streamable HTTP MCP servers; openapi-servers examples cover areas such as files, Git, memory, weather, SQL, and RAG.
- mcpo can serve multiple configured MCP servers from one process, with optional hot reload; openapi-servers presents separate FastAPI examples intended to run or adapt.
- mcpo includes API-key protection and documents OAuth 2.1 for Streamable HTTP servers; openapi-servers describes configurable restrictions for its filesystem example and optional MCP bridges.
- Both projects use Python and MIT licensing. mcpo lists 4.4k stars and 497 forks, while openapi-servers lists 1.1k stars and 179 forks.
- openapi-servers is marked inactive, with no commits or releases in over a year; mcpo is not archived.
Choose mcpo if you…
- need to expose existing MCP tools through generated OpenAPI endpoints and interactive docs.
- want to connect command-launched, SSE, or Streamable HTTP MCP servers through a proxy.
- need to consolidate configured MCP servers or protect the proxy with API-key authentication.
Choose openapi-servers if you…
- want FastAPI reference implementations to run or adapt for tools and data such as Git, SQL, weather, or files.
- are building OpenAPI-based access to external services for LLM agents without requiring a project-specific protocol.
- want to explore an optional MCP-to-OpenAPI bridge while migrating or integrating tools.
Compare the numbers side by side, or add more projects
This comparison is generated with AI from the OSRepos analyses of both projects. Always check each project's repository and documentation before choosing.