Stateless MCP and the End of Custom Session Workarounds for Long-Running Agents

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The current design of the MCP session model assumes tool invocations which live only for a limited amount of time. A stateless approach is needed to solve issues which occur due to long-running agents which operate via distributed architecture.

Consider a case where an agent has been running for six hours – it queries databases, invokes APIs, waits for the results from a background process, and survives a network interruption. There is no problem with the state of this agent itself, but one of the MCP servers which the agent connects to has just restarted 20 minutes ago.

The problem: one session, four interpretations

Currently, MCP (spec 2025-11-25) starts each client/server interaction with an initialize handshake. The server may provide an MCP-Session-Id, which the client is supposed to include in all further requests. When the server closes that session, the client receives a 404 response and is forced to start...

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