Sdd/parallel reasoning agent - #96
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…am drops OpenSandbox exec streams a command's output over one long-lived SSE connection through the server proxy. When that connection crosses a load balancer with a TCP idle/stream-duration cap (e.g. an AWS NLB fronting an istio east-west gateway, default 350s), a command that runs a while gets its stream silently reaped and the client hangs (~4h) since the SSE read timeout is disabled. Add OpenSandboxOperationConfig.background_exec (default False): submit the command in the background, then issue short get_command_status / get_background_ command_logs polls instead of holding one stream open. No single request is long enough to be reaped, so it is robust across LB idle/duration limits. Also default command_retries 0->3 in the shipped config (recovers RST-family drops) and enable background_exec there since OpenSandbox exec always traverses the server proxy. Root cause confirmed via OpenSandbox issues #1277/#507/#96 and a mesh trace (sbx east-west NLB, 350s idle, no override). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: Hemil Desai <hemild@nvidia.com>
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