MCP Scope Step-Up Authorization: From Implementation to Spec Contribution

WunderGraph's Cosmo platform, an open-source federated GraphQL solution, facilitates AI interactions with APIs by introducing a detailed per-tool authorization system, aimed at enhancing security and efficiency through OAuth scope enforcement. This system requires AI agents to obtain only the necessary permissions, rather than a broad "god token," for each operation, addressing the varying risk levels of different GraphQL operations. The implementation revealed challenges in aligning the protocol's specifications with RFC 6750, particularly regarding scope management during re-authorization requests. WunderGraph proposes refining the protocol to ensure servers only return the necessary scopes for specific operations, allowing clients to manage accumulated scopes across sessions. This clarification aims to improve client-server interactions and align the MCP (Managed Connectivity Protocol) spec with established OAuth practices, ultimately promoting a model of progressive, least-privilege authorization that could become a standard for AI platforms.

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