Muse Code is Meta autonomous command-line coding agent designed to execute end-to-end software engineering workflows directly from the terminal. Built for multi-agentic development, the tool moves beyond simple inline completions by inspecting entire repository architectures, formulating explicit implementation strategies with user approval checkpoints, modifying source files across multiple packages, and verifying modifications via local test runners and linters.
The underlying intelligence is driven by Meta Muse Spark 1.3 foundation model family, featuring a 1-million-token context window and specialized multimodal reasoning for software engineering. Muse Spark is complemented by Muse Glimmer, an open-weight 30-billion-parameter model designed for local, latency-critical tasks and on-device execution. The agent utilizes OS-level sandboxing and explicit workspace trust boundaries to protect local developer environments from unintended execution side effects.
Muse Code features a multi-agent orchestration architecture that coordinates persistent background subagents to perform parallel tasks such as dependency analysis, test execution, and documentation lookup without blocking interactive developer flow. Built-in terminal commands include /plan for generating approval-gated change strategies, /grill for stress-testing and probing architectural plans, and /goal for driving complex objectives to completion. In addition, multi-session setups can exchange status and artifacts over Unix domain sockets.
Session reliability and transparency are maintained through an append-only local event log that records every model invocation, tool execution, and source patch, providing crash safety and replay-exact auditability. Muse Code operates on token-based pass-through billing via the Meta Model API on dev.meta.ai, offering both private Standard Tier and training-opted Contributor Tier access with zero upfront license fees.
