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Letta Code

Maker: letta-ai License: Apache-2.0 First released: 2025-10-25 Language: TypeScript
CLI

About

Letta Code applies the MemGPT research lineage (memory blocks, sleep-time compute) to coding: agents hold identity and experience in editable memory blocks, learn skills at global, project, and agent scope, and can rewrite their own prompts and even their harness through a mods mechanism. Memory is git-tracked and syncable to GitHub, /sleeptime runs periodic offline 'dreaming' to consolidate context, and /doctor audits memory health. Subagents, hooks, message search, and messaging integrations (Slack, Telegram, Discord) extend it beyond a single terminal session, with optional Letta Cloud for remote state and GitHub Actions. The harness is Apache-2.0 and free; the cloud layer is the paid part.