A technical article details a reproducible issue with an MCP session across different replicas, leading to a 400 error after an initial 200 success. The problem arises when a proxy sends a tool call to a different replica than the one that initially established the session. The author proposes a solution involving separating protocol state from application state, ensuring that protocol facts are available on the current request and durable application state uses explicit, shared domain handles. This approach aims to make the application contract inspectable and support stateless replicas, moving away from sticky sessions and shared opaque session stores. AI
RANK_REASON Technical article detailing a specific bug and proposed solution in a protocol. [lever_c_demoted from research: ic=1 ai=0.4]
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