Letta

Letta, formerly known as MemGPT, builds stateful agents with memory that can learn and improve over time. The project is under active development, but this repository now serves as a landing page. Current source lives in the letta-code repository, which carries the agent harness, the interactive terminal UI, the App Server, channels and the runtime behind the desktop and web apps.

Installation goes through npm as a global package. One command then opens the interactive terminal interface, and another starts the App Server for local or self-hosted agents.

Agents built this way are reachable from more than a terminal window.

• Desktop app: A native client for macOS, Windows and Linux.
• Browser: A hosted chat interface that works on mobile as well.
• Channels: Slack, Telegram, Discord and custom channels put agents where conversations already happen.
• Agent SDK: A TypeScript SDK for building agents into your own applications.
• Letta Cloud: Keeps agent memory, identity and conversations available across machines.

One caveat matters before cloning. The retired Letta V1 server source sits on an archive branch, preserved with its tags and releases intact for reproducibility, but it is unsupported, receives no fixes or security updates and should not be run in production. Installation, development and deployment instructions now live with the letta-code repository and the documentation site rather than here.