WebSocket reconnection in AI agents: transport recovery vs. session recovery

AI agents face unique challenges with WebSocket disconnections due to their mid-execution silences, which can be misinterpreted as idle time by infrastructure like AWS Application Load Balancer and Cloudflare, leading to unintended connection drops. These disconnections result in the loss of session context, including tool call results and generated tokens that occur during the gap. While WebSocket transport reconnection restores the connection itself, it does not recover the session state, necessitating a session recovery layer to store and replay in-flight data. Solutions like Ably AI Transport address these issues by providing automatic reconnection, history compaction, and protocol fallback, ensuring that client sessions can resume seamlessly without requiring complex application code. Configuring WebSocket servers to send regular ping frames can prevent idle timeouts, keeping connections alive under the thresholds set by AWS ALB and Cloudflare.

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