How to add OAuth to your MCP server

When building a Model Context Protocol (MCP) server, developers face the challenge of authenticating users, as the MCP specification does not provide explicit guidance on this aspect. Three viable options are available depending on the level of control and expertise a team desires: building a custom OAuth server, using WorkOS as an OAuth bridge, or employing AuthKit for a fully hosted OAuth solution. The first option offers complete control but requires significant expertise in OAuth 2.0 implementation and maintenance. The second option allows teams with existing user databases to maintain user authentication while outsourcing token management to WorkOS. The third option is ideal for new MCP servers or those seeking a fully managed authentication solution, as AuthKit handles the entire OAuth flow. Each option offers a different balance between control, complexity, and ease of setup, allowing developers to choose based on their specific needs and resources.

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