letta

Letta is a leading agent framework in the 2026 AI agent engineering landscape (23.6k★).

When to use this skill

• Stateful agents with self-editing memory (MemGPT research lineage)
• Memory blocks (e.g. human/persona) the agent rewrites via memory tools
• Letta Code CLI: local terminal agent with skills + subagents + continual learning (npm i -g @letta-ai/letta-code)
• Letta API/server: REST + Python/TS SDKs for app integration
• Model-agnostic; model leaderboard published (leaderboard.letta.com)
• Agent File (.af) portable agent format; sleep-time compute for background memory maintenance
• Ecosystem overlap: agent-memory-architecture (this repo) covers memory design concepts and already references Letta as a backend — letta skill covers operating it concretely

Installation

npm install -g @letta-ai/letta-code   # CLI; server SDKs: pip install letta-client / npm i @letta-ai/letta-client