The one thing that separates every agent bot system from being just a glorified automation or just mediocre is long-term memory and semantic search.
Long-term memory means that conversations, experiences, decisions are all stored in a database that is accessible by your AI (just like a brain).
Semantic search means that your memory is set up in such a way that your AI can actually search through it in real time.
You get these two rights, and anything you build will be unstoppable.
Bonus: Add a simple control loop on top to hold onto goals, break them into steps, act, observe, and adjust and any system or agent learns and compounds over time.