Meta launches Muse Code: a terminal coding agent on Muse Spark 1.2
Meta just shipped Muse Code, a terminal-based coding agent built on Muse Spark 1.2, targeting developers who work on large, complex software projects.
What Muse Code Does
The agent generates and debugs code, but the more interesting piece is its architecture. Muse Code manages multiple persistent background sub-agents that run throughout each session. According to Meta, those agents work independently and decide on their own when to report back to the main agent, which is meant to cut redundant information gathering and speed up difficult tasks.
The tool also keeps a local event log that records every model call, tool use, approval, and edit. Meta says this lets the agent recover precisely from failures, so long-running tasks don’t lose progress if something goes wrong mid-session.
Built-In Commands
Muse Code ships with a set of default slash commands:
/plan: converts assignments into approval-gated plans/grill: stress-tests those plans before execution/goal: works toward a defined objective across the session
The tool can interpret video file inputs and generate outputs like tailored marketing and booking pages for holiday properties.
About Muse Spark 1.2
The underlying model is an update to Muse Spark 1.1, with improvements in code generation, debugging, codebase comprehension, and end-to-end developer workflow support. Meta says it was trained on large coding tasks across a range of programming environments and co-trained with Muse Code specifically to optimize their combined performance.
In Meta’s own evaluations, Muse Spark 1.2 developed optimized solutions for specific Nvidia GPU workloads using its built-in planning and code generation features. The earlier Muse Spark 1.1 was used to generate coding challenges that fed improvements into 1.2, particularly around following complex instructions.
Availability
Muse Spark 1.2 is available now inside Muse Code and through the Meta Model API. The Muse Spark series launched in April, about a month before Muse Spark 1.1 shipped for developer testing. Muse Spark 1.2 follows roughly a month after that.
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