They don’t have persistent memory though. Models are static, what you have is a model that will reprocess the whole series of prompts + some data fetched from a data store. A harness is just a while loop prompting an LLM and executing tool calls, but the model is purely static
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The model does not. The system it runs in can. My agents have persistent memory. It is not at all clear whether or the distinction that the long-term memory is external from the model matters.