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

calendar_today March 4, 2026 person Ahmet Soormally domain wundergraph

Cosmo’s MCP server already exposes your graph as AI-ready tools. When we added per-tool OAuth scope step-up authorization so clients don’t need a god token, we hit an infinite loop. The root cause: a gap between the MCP spec and RFC 6750 on scope challenges, plus SDK behavior that overwrites scopes instead of accumulating them.

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