Episodic Memory
Memory of specific past events, conversations, and interactions, allowing the agent to recall what happened in previous sessions.
Last updated: April 26, 2026
Definition
Episodic memory in agents is the equivalent of human memory for specific events. "Last Tuesday Alice asked us to cancel her order #4821, we cancelled it, and she was upset about the restocking fee." That episode survives between sessions and is retrievable when relevant. Storage is typically a vector database keyed by user or thread, with each episode stored as a summary plus full transcript. Retrieval pulls the most-relevant past episodes by similarity to the current conversation. Episodic memory is what makes a chat agent feel like it remembers you instead of starting cold every time.
When To Use
Add episodic memory as soon as you have repeat users. The cold-start feel of every conversation is the #1 complaint about chat agents that lack it.
Related Terms
Building with Episodic Memory?
I've shipped this pattern in real production systems. If you want a second pair of eyes on your architecture, that's what I do.