Meta · Coding harness
Muse Code: Meta's beta terminal agent with persistent background workers
Muse Code is a macOS/Linux terminal agent built around persistent async workers, event-log replay, and a model co-trained for the harness.
What changed
- Background agents remain active across a session instead of being recreated for every task.
- A local append-only event log is designed to make long-running work restart-safe.
- The beta includes plan, grill, and goal workflows for breaking down difficult repository tasks.
Best fit
- Terminal-native engineers
- Long-running multi-step tasks
- Teams testing multi-agent workflows
What to be careful about
- The beta requires a Meta account and works on macOS and Linux.
- Parallelism and model quality need independent testing on real repositories.
Dataset snapshot: Muse Code is also represented in the checked comparison dataset. Prices and benchmark figures carry their own field dates.