Muse CLI Chat (unofficial)

VS Code / Cursor sidebar chat that drives Meta’s Muse Code CLI (muse exec --json). The agent harness stays Muse; this extension is only the IDE UI.

Not affiliated with Meta. Muse Code, Muse Spark, and related marks belong to Meta. Install and authenticate Muse separately: Muse Code docs.

Requirements

macOS or Linux (Muse Code CLI does not support Windows yet)
Muse Code installed and signed in (or META_API_KEY set)
VS Code or Cursor
An open workspace folder that is not a symlink root (Muse rejects reparse points)

curl -fsSL https://dev.meta.ai/install.sh | sh

Install (published)

After this extension is on a marketplace:

VS Code Marketplace: search “Muse CLI Chat” (publisher codemarc)
Open VSX / Cursor: same extension id codemarc.muse-cli-chat

Or install a local .vsix:

cd tools/extensions/muse-code
bun install
bun run package
code --install-extension muse-cli-chat-0.1.0.vsix
# Cursor: cursor --install-extension muse-cli-chat-0.1.0.vsix

Develop

cd tools/extensions/muse-code
bun install
bun run compile

Open this folder in VS Code/Cursor and press F5 (Run Muse Code Extension). In the Extension Development Host:

Open a real directory (not a symlink)
Command Palette → Muse CLI Chat: Open Chat (or click the Muse activity icon)
Optional: set muse.useEchoProvider to true for offline JSONL UI testing
Send a prompt

Commands

Command	Action
Muse CLI Chat: Open Chat	Focus the sidebar
Muse CLI Chat: Send Selection	Send the editor selection as context
Muse CLI Chat: New Session	New `--session-id`
Muse CLI Chat: Stop	SIGINT the running `muse exec`
Muse CLI Chat: Open Interactive Terminal	Full Muse TUI (approvals, slash commands)
Muse CLI Chat: Check Installation	`muse --version`

Settings (`muse.*`)

Setting	Default	Notes
`executablePath`	`muse`	Also tries `~/.local/bin/muse`
`model`	empty	Optional `--model`
`reasoningEffort`	empty	Optional `--reasoning-effort`
`trustWorkspace`	`true`	Loads project skills/rules
`disableApproval`	`true`	Needed for headless; sandbox stays on
`yolo`	`false`	Disables approval and sandbox (dangerous)
`useEchoProvider`	`false`	Offline UI smoke tests
`extraArgs`	`[]`	Extra argv

Safety

Headless muse exec cannot answer interactive approval prompts. The extension defaults to --disable-approval with the OS sandbox still on (Meta’s recommended CI posture). For staged shell approvals, use Muse CLI Chat: Open Interactive Terminal.

Never enable muse.yolo on a machine with real credentials unless you fully trust the workspace. Enabling it shows a one-time warning.

Tests

bun test
bun run check

Publish

Create publisher codemarc on VS Code Marketplace and/or Open VSX (change publisher in package.json if you use another id).
bun install then bun run package (produces muse-cli-chat-0.1.0.vsix).
Open VSX (good for Cursor): npx ovsx publish muse-cli-chat-0.1.0.vsix -p <token>
VS Code Marketplace: bunx vsce publish --no-dependencies (after vsce login)

Production compile minify: NODE_ENV=production bun run compile.

Muse CLI Chat

Marc J. Greenberg (CodeMarc)