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Persistent agent
Letta Code
An open-source agent harness from Letta whose long-lived agents rewrite their own memory and skills, can run always-on with heartbeats and cron schedules, and can be reached from a CLI, desktop app, browser, Telegram, Slack or Discord.
- Maker
- Letta
- Status
- Available
- Launched
- 25 Oct 2025
- Open source
- Yes
- Pricing
- free, open source (bring your own model API keys); agent state is kept in Letta Cloud by default, or locally
- Repository
- https://github.com/letta-ai/letta-code
Capabilities
- memory
- heartbeat
- scheduled tasks
- self-improving skills
- multi-agent
- code execution
- hooks
Surfaces
- cli
- desktop
- macos
- windows
- linux
- web
- telegram
- slack
- discord
Plugs into
- skills
- hooks
Runs on
- openai
- anthropic
- z-ai