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An autonomous agent set loose overnight on a refactor can finish the morning having redone its own completed work, not crashed, not errored, just quietly rewriting files it already fixed, hours after it fixed them.
The instinct is to blame the model. But the same model, used interactively across an equally long session, usually doesn't fail this way nearly as often. The difference isn't capability, it's that someone was in the loop, implicitly signaling "that part's done, move on." An unattended agent has no equivalent. Nothing marks a finished subtask as closed, so it stays active in context at the same rate the task grows, until a meaningful share of what the agent's weighing at any moment is work that's already done.
That's a design gap, not a model limit. It needs an explicit mechanism, a task list the agent checks against, a summarization step that collapses finished work into a short note, a hard boundary between subtasks where only the outcome carries forward.

medium.com

Unattended AI Agents Have a Context Problem Humans Never Had

A team sets an autonomous coding agent loose overnight on a multi-file refactor: rename a core interface, update every call site, adjust…

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