Real T3 server / Codex shared provider session / fresh synthetic git project Commit 08b8689a856bb282350bbb30c94e5d8cd22fec7a COMMAND: t3 thread start <12-worker prompt> --provider codex --model gpt-6-astra --wait --json 12 app-owned delegates completed five separate echo commands each. Initial delegated updates: 168 rows / 168 distinct payload+metadata pairs SEND parent: Execute exactly one shell command: sleep 120. Wait for it to finish, then reply done. Do not delegate. Parent follow-up accepted. OBSERVED parent sleep 120 command running in persisted turn-item.updated. SEND completed child 1: three separate follow-up echo commands SEND completed child 2: three separate follow-up echo commands SEND completed child 3: three separate follow-up echo commands Child 2 follow-up completed successfully. Child 3 follow-up completed successfully. Child 1 follow-up completed successfully. Follow-up native provider turn-item rows: 48; app-created messages are counted separately. FOLLOW-UP RESULT (native provider items): 48 rows / 24 distinct payload+metadata pairs; maximum identical copies = 2. child 3 assistant_message completed: 2 identical copies; distinct event IDs 2 child 3 command_execution running: 2 identical copies; distinct event IDs 2 child 3 command_execution completed: 2 identical copies; distinct event IDs 2 child 1 assistant_message completed: 2 identical copies; distinct event IDs 2 child 1 command_execution running: 2 identical copies; distinct event IDs 2 child 1 command_execution completed: 2 identical copies; distinct event IDs 2 child 2 assistant_message completed: 2 identical copies; distinct event IDs 2 child 2 command_execution running: 2 identical copies; distinct event IDs 2 child 2 command_execution completed: 2 identical copies; distinct event IDs 2 child 3 command_execution running: 2 identical copies; distinct event IDs 2 child 3 command_execution completed: 2 identical copies; distinct event IDs 2 child 2 command_execution running: 2 identical copies; distinct event IDs 2 child 2 command_execution completed: 2 identical copies; distinct event IDs 2 child 1 command_execution running: 2 identical copies; distinct event IDs 2 child 1 command_execution completed: 2 identical copies; distinct event IDs 2 child 3 command_execution running: 2 identical copies; distinct event IDs 2 child 3 command_execution completed: 2 identical copies; distinct event IDs 2 child 2 command_execution running: 2 identical copies; distinct event IDs 2 child 2 command_execution completed: 2 identical copies; distinct event IDs 2 child 2 assistant_message completed: 2 identical copies; distinct event IDs 2 child 3 assistant_message completed: 2 identical copies; distinct event IDs 2 child 1 command_execution running: 2 identical copies; distinct event IDs 2 child 1 command_execution completed: 2 identical copies; distinct event IDs 2 child 1 assistant_message completed: 2 identical copies; distinct event IDs 2 RESULT: 48 native rows, 24 distinct updates, 2 copies per update maximum.