Letta Code
Letta Code is a memory-first coding harness, built on top of the Letta API. Instead of working in independent sessions, you work with a persisted agent that learns over time and is portable across models (Claude Sonnet/Opus, GPT-5, Gemini 3 Pro, GLM-4.6, and more).
Read more about how to use Letta Code on the official docs page.
Get started
Requirements:
- Node.js (version 18+)
- A Letta Developer Platform account (or a self-hosted Letta server)
Install the package via npm:
npm install -g @letta-ai/letta-code
Navigate to your project directory and run letta (see various command-line options on the docs):
Memory and Skill Learning
All agents in Letta are stateful: they maintain context forever and can self-edit their own memory blocks.
If you’re using Letta Code for the first time, you will likely want to run the /init command to initialize the agent’s memory system:
> /init
Over time, the agent will update its memory as it learns. To actively guide your agents memory, you can use the /remember command:
> /remember [optional instructions on what to remember]
Letta Code works with skills (reusable modules that teach your agent new capabilities in a .skills directory), but additionally supports skill learning. You can ask your agent to learn a skill from it's current trajectory with the command:
> /skill [optional instructions on what skill to learn]
Read the docs to learn more about skills and skill learning.
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