RAG and agent memory get used as synonyms. They aren't. RAG reads from a corpus that someone else wrote: docs, a wiki, a product catalogue. The agent only reads. Agent memory starts when the agent writes back: → a preference the user mentioned → the outcome of a task it just finished → a correction someone made to its answer Writing back changes the problem. You now decide what is worth keeping. You merge the new fact with what's already stored, and you handle the old fact it contradicts. Cognee's agent memory guide puts it in one line: "The moment your system starts writing back — capturing facts, recording previous interactions, or storing the outcomes of its own work — you've moved beyond RAG into agentic memory." Read-only retrieval is a search problem. Read-write retrieval is a data-management problem. Read more here: