Meta releases Muse Code in beta, a terminal coding agent with persistent background subagents and a replay-exact event log

Sources: primary, coverage, discussion
Summary: Meta released Muse Code as a beta, a command-line coding agent that runs subagents in the background across a session. Every model call, tool run, approval and edit is appended to a local event log that replays exactly. The same post releases Muse Spark 1.2, the model that powers Muse Code, which Meta states is available today in Muse Code and in the Meta Model API with expanded global access.
Why it matters: Appending every model call, tool run, approval and edit to a local event log is what makes the agent restart-safe, so a crash resumes rather than restarts a long-running task.