The agent we built in Part 6 is sharp — it plans, chains tools, and answers genuinely hard questions. It also has the memory of a goldfish. Ask it "when does the AI Club meet?", get a good answer, then ask "how many days until that?" — and it has no idea what "that" is. Every question starts from a blank slate.
That's the gap between a query tool and an assistant. A real assistant holds a conversation. It remembers what you just asked, resolves "that" and "those two" and "the second one" against what's already been said, and doesn't make you repeat yourself.
The fix is smaller than you'd think. In Part 6 the messages list lived inside the agent function and got thrown away after each question. In this post we lift that list out of the function and into a session object so it survives from one turn to the next. That's most of the work. The interesting part — the part that bites people — is what happens when the conversation gets long enough that you have to start forgetting old turns without breaking the tool-call bookkeeping.
I'm B Torkian, NVIDIA Developer Champion at USC. Part 7 of the series.
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