Blog
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The cost of a turn
Costs scale with usage and with history length, so your heaviest users get more expensive the longer they stay. That shapes every state decision you make.
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Why characters drift
A fixed definition against growing history, and the history includes the model's own output. Drift is a proportion problem that reinforces itself.
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Summarisation and what it loses
Compression is not neutral. It destroys specifics first and decays generationally, so the oldest history degrades fastest — what a relationship rests on.
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What the model remembers between turns
Nothing. Continuity is entirely something you build, and the four ways of building it fail in four different directions.
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A persona is state, not a personality
Four categories of state get stored as one blob, and that is why a character cannot be versioned, corrected, or debugged when it goes wrong.