Resumability

The SDK supports resumable sessions. When a client disconnects and reconnects, it can resume its previous session.

Enabling Resumability

Provide an EventStore during server creation:

use rust_mcp_sdk::event_store::InMemoryEventStore;

let server = create_axum_server(
    server_info,
    handler,
    AxumServerOptions {
        event_store: Some(Arc::new(InMemoryEventStore::default())),
        ..Default::default()
    },
);

When the client reconnects with the same session ID, the server replays missed events. For production, you can implement EventStore with a persistent backend (Redis, Postgres, etc.).