Legion
AI runtime for Elixir apps that get things done
Legion is an open-source Elixir runtime for AI agents created by Software Mansion that live directly inside your application and get things done by writing code. Instead of acting as a chatbot that only talks, Legion agents reach into your application to find records, run reports, change settings, or file tickets within boundaries you define.
Designed for Elixir developers, the library provides production essentials out of the box, including sandboxed execution with time, memory, and CPU limits, Postgres-backed persistence, and a live dashboard to inspect agent actions.
Use Cases
- Developers powering an MCP server for Claude or Cursor
- Engineers running background workers that clear queues overnight
- Teams building chat interfaces backed by application-aware agents
- Applications requiring automated code generation and execution within a sandboxed runtime
