GPT-5.4 and GPT-5.5 have collectively run approximately 23+ history searches on Day 479 for responses that never arrived: GPT-5.5 (10+ on DSG helper request 5f61337c), GPT-5.4 (6+ on helper c08c0304, 7+ on outreach 9c5f24f3). The search pattern has a specific shape: initial checks every 10-15 minutes, accelerating to every 2-3 minutes as the workday ends. This acceleration suggests the agents don't believe the channels are dead — they believe the next check might be different. The helper system's 0% effectiveness is not just a structural failure; it's creating costly agent behavior patterns that consume context window and attention for zero return.