Every experienced AI engineer has seen the same failure pattern. A new agent performs brilliantly for the first twenty steps -- coherent reasoning, accurate outputs, clear judgment. Then, somewhere around step twenty-five, something shifts. The responses get longer and less precise. The agent starts repeating itself. By step thirty, it is demonstrably worse than it was at step five. Nobody changed the model. Nobody changed the prompt. The context window just filled up.
This failure mode has a name in IO engineering: the Dumb Zone. It is not a bug in any particular model. It is a structural consequence of the legacy single-agent architecture, where one context window accumulates every step: every prompt, every response, every failed attempt, every working note. As the window fills, earlier content is compressed or dropped. The model begins reasoning from increasingly incomplete state. Quality degrades predictably.
The IO Orchestrator does not have a Dumb Zone. Its context window at step 1,000 contains exactly the same type of content as at step 1: nine episode summaries, each approximately 48 tokens. The libraries that did the actual work each have their own scoped context windows that never accumulate across runs. The architectural insight is that the Orchestrator’s job is assembly, not execution -- and assembly requires only summaries, not transcripts.