Does my AI agent memory graph change when it reads, or only when it writes?

Automated excerpt

I put that question to six systems, Mem0, Zep with Graphiti, Cognee, Letta, Supermemory and Mnemoverse, and read each vendor's own pages and published code. Zep: "Zep's temporal Context Graph is the unit of agent memory. The graph updates as new data arrives. " Cognee extracts entities and relationships into a graph store, Mem0 ships a feature named Graph Memory, Supermemory sells a memory graph on its product page, Letta resolves links between memory files, and Mnemoverse ships a learned association graph.

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