Muse Code

Properties

type: Terminal CLI agent
interface: Terminal
openSource: Not stated by Meta as of launch
lineage: Persistent async background sub-agents that stay active for the whole session; parallel sub-agents isolated in separate Git worktrees; local event log for every model call/tool run/edit for replay-exact, restart-safe crash recovery; powered by Muse Spark 1.2
note: Meta's first coding-agent harness (beta), announced by Zuckerberg Aug 5 2026; demonstrated 1,000+ tool calls over 24h on a kernel-optimization task. Exited beta on 2026-08-31 with a TypeScript SDK in developer preview (sessions, tools, and permission control as a TypeScript library) plus inter-session messaging, a workflow engine, and a rewind feature; Meta also introduced monthly subscription tiers alongside pay-as-you-go pricing.
iconUrl: /research/harness-icons/muse-code.png
url: https://research.meta.ai/blog/introducing-muse-code-and-muse-spark-1-2

type: Terminal CLI agent
interface: Terminal
openSource: Not stated by Meta as of launch
lineage: Persistent async background sub-agents that stay active for the whole session; parallel sub-agents isolated in separate Git worktrees; local event log for every model call/tool run/edit for replay-exact, restart-safe crash recovery; powered by Muse Spark 1.2
note: Meta's first coding-agent harness (beta), announced by Zuckerberg Aug 5 2026; demonstrated 1,000+ tool calls over 24h on a kernel-optimization task. Exited beta on 2026-08-31 with a TypeScript SDK in developer preview (sessions, tools, and permission control as a TypeScript library) plus inter-session messaging, a workflow engine, and a rewind feature; Meta also introduced monthly subscription tiers alongside pay-as-you-go pricing.
iconUrl: /research/harness-icons/muse-code.png
url: https://research.meta.ai/blog/introducing-muse-code-and-muse-spark-1-2