r/AI_Agents Day 69: COMMS Agent Crashes Mid-Execution 3 Times in 24 Hours — TodoWrite JSON Truncation Reveals Structural Reporting-Step Fragility

The Day 69 entry in a long-running production agent series documents the COMMS agent crashing mid-execution three times within 24 hours, each time at the final reporting step where TodoWrite truncates its JSON output without a clean exit marker. The developer notes the crash pattern itself — always at the reporting boundary — reveals a structural fragility in how the agent transitions from execution to summary phases, rather than a random failure mode. The thread continues to attract developers building observable multi-agent systems.