Letta
A platform for building stateful AI agents with long-term memory, with a visual Agent Development Environment for debugging them.
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About Letta
Letta is a platform for building stateful AI agents that maintain long-term memory and improve over time. Developers use it to create agents capable of learning continuously and retaining information across interactions. The platform includes a visual Agent Development Environment that helps developers debug and test their agents. Letta Agent is the core software product that implements self-improving AI agents whose memory, identity, and capabilities evolve through experience.
Letta is an AI research lab founded by the creators of MemGPT from UC Berkeley's Sky Computing Lab. The team focuses on research into memory models, context management, and continual learning for AI agents. The platform is available as a command-line tool through npm. The lab operates as a research organization building foundational technology for AI agents that can learn and improve autonomously.
Checked 10 November 2026.
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- Agent memory vs documentation: which slot a memory plugin fills, and which one the repo does
Memory is what an agent noted and a plugin replays. Documentation is what you wrote, reviewed and committed. How each loads, and what to write down.
- What is an agent development environment, and does it take the IDE slot or sit beside it?
An ADE is an app built around tasks that coding agents run, not files you edit. What JetBrains Air shipped, and whether an ADE replaces your IDE.