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The removal of protocol-level sessions in the Model Context Protocol (MCP) specification fundamentally shifts state management from the transport layer to application logic, enabling stateless horizontal scaling for remote server deployments. This architectural change allows developers to leverage standard load balancing and serverless functions like AWS Lambda without maintaining sticky connections or shared session stores. By decoupling protocol affinity from application state, the update simplifies infrastructure requirements while preserving the ability to handle complex, multi-step agentic interactions at the application level.

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Stateless MCP Removes Session Affinity Requirements for AWS Server Deployments

InfoQSeptember 25, 20262 min read

AWS details how the latest Model Context Protocol specification removes protocol-level sessions, sticky-session requirements, and session storage for remote MCP servers. The change enables independent request routing and simpler horizontal scaling while shifting application state, retries, observability, and idempotency concerns to other layers. By Leela Kumili

AWS has outlined how the latest Model Context Protocol (MCP) specification changes remote MCP server deployments by removing protocol-level sessions and allowing requests to reach any available server instance. The change eliminates the protocol requirement for sticky sessions and…

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