Why it matters

Letta pioneered structured agent memory. Understanding shapes memory design.

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The architecture

Core memory (persona + human).

Recall memory (conversation history).

Archival memory (long-term).

Letta / MemGPT memory tiersCore memorypersona + humanRecall + archivalhistory + long-termJava clientREST to Lettaletta.com; three-tier memory analogous to OS memory hierarchy
Letta.
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How it works end to end

Packer 2023 MemGPT paper.

REST API; Java client via HTTP.

Configurable persona.