Zep gives my agent perfect recall. It still can't answer "average per group" about its own memory.

Originally published at nlqdb.com/blog

If you've wired up Zep you know the pitch: it's the Context Lake — a temporal knowledge graph (Graphiti, 27k+ stars) that stores every fact your agent learns as a node with a validity window, resolves entities, and hands back the most relevant facts at query time. For recall it's genuinely good, and it publishes benchmarks (LongMemEval, DMR) to prove it.

But we kept hitting the same wall. Once the agent had logged a few hundred things, we wanted to ask questions about the memory, not retrieve from it:

"Top 10 topics I logged this month, ranked by count."

"Average deal size per stage for enterprise customers."