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[Doc] Note sticky session requirement for multi-instance deployments #297

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[Doc] Note sticky session requirement for multi-instance deployments #297

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Expand Up @@ -138,6 +138,11 @@ end
> so it must run in a single process. Use a single-process server (e.g., Puma with `workers 0`).
> Multi-process configurations (Unicorn, or Puma with `workers > 0`) fork separate processes that
> do not share memory, which breaks session management and SSE connections.
>
> When running multiple server instances behind a load balancer, configure your load balancer to use
> sticky sessions (session affinity) so that requests with the same `Mcp-Session-Id` header are always
> routed to the same instance.
>
> Stateless mode (`stateless: true`) does not use sessions and works with any server configuration.

### Configuration
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