🧠 Agent memory
Persistent, queryable memory for AI agents — across sessions, devices, and tools.
Cairn
The open-source context & reliability layer for AI agents — memory, lean context, guardrails, and multi-device sync in one self-hosted Rust binary.
📦 Lean context
Smart retrieval keeps only what matters in the LLM context window. Lower tokens, sharper answers.
🛡️ Guardrails
Built-in reliability layer — schema validation, output checking, and policy enforcement.
🔁 Multi-device sync
Pick up where you left off — sync state across your laptop, server, and dev environments.
🔌 MCP server
Speaks the Model Context Protocol. Plugs into Claude Code, Cursor, and any MCP-compatible client.
⚙️ One Rust binary
Single self-hosted binary. No Docker, no service mesh — just download, run, configure.
Get started
Try Cairn
Cairn is open-source under Apache-2.0. Run the binary, point your MCP client at it, and start giving your agents memory.