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The Memory Layer: sections and modules
T10.2

Long-Term & Agentic Memory

Share memory across threads with a LangGraph `Store` (in-memory and Postgres).

Lessons
7 lessons
By
Sourav Banerjee
Prerequisites
None

Lessons

Start module
7 lessons
  1. 1
    Long-Term & Agentic Memory: overview

  2. 2
    Cross-thread memory with a Store

  3. 3
    Session, semantic, episodic and procedural memory on SQLite

  4. 4
    A combined-memory agent

  5. 5
    Episodic + semantic stack and multi-hop graph memory

  6. 6
    MemGPT tiers, Voyager skill library, Agent Workflow Memory

  7. 7
    Long-Term & Agentic Memory: interview questions

Practise and Check

Deliverable
Personal RAG: give your assistant semantic memory of user preferences and show that answers in a new thread use them.
Assessment
Answer the five Interview questions without notes, then run the lab.
Interview probe
A Larkspur customer reports that the assistant greeted him as Dana and mentioned her annual business plan. How do you find out how one customer's memory reached another?
Common mistakes
  • Letting the model fill in user_id as an ordinary tool argument
  • Trusting TTL expiry on SqliteStore without running a sweeper
  • Preloading facts with store.search() and no limit=

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