• context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.
• token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
• AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

Retaining reasoning across turns instead of rebuilding context is a change most agent loops can make, and the reported swing is large enough to be worth testing.

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