Meta Launches Muse Code, a Terminal Coding Agent With Parallel Sub-Agents in Isolated Git Worktrees

Meta launched Muse Code in beta on August 5, 2026. The terminal-based agent, powered by Muse Spark 1.2, dispatches parallel sub-agents into isolated Git worktrees to plan, implement, and validate multi-file changes across large repositories without touching the developer's working copy. Mark Zuckerberg announced the tool, which installs with a single command and targets workflows dominated by OpenAI's Codex and Anthropic's Claude Code.