Letta | Machines that learn

# Letta > Letta builds stateful AI agents that learn from experience through memory and context management. ## Canonical resources - [Context Constitution](https://www.letta.com/constitution/): The living set of principles governing how AI agents manage context to learn from experience. - [Context Constitution — Markdown](https://www.letta.com/constitution.md): The machine-readable source of the canonical rendered Constitution. - [Context Constitution announcement](https://www.letta.com/blog/context-constitution/): Background on why Letta created the Constitution. - [Stateful agents](https://www.letta.com/blog/stateful-agents/): A definition of stateful agents and the architecture behind them. - [Continual learning](https://www.letta.com/blog/continual-learning/): How agents learn through token-space representations rather than model-weight updates. ## Research and products - [Research](https://www.letta.com/research/): Letta research publications and benchmarks. - [Blog](https://www.letta.com/blog/): Technical articles about memory, context, and stateful agents. - [Letta Agent](https://www.letta.com/agent/): Letta's stateful agent product. ## Source and contributions - [Context Constitution on GitHub](https://github.com/letta-ai/context-constitution): Source history, feedback, and contributions.