Meta Launches Muse Code, a Terminal Coding Agent With Parallel Sub-Agents

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