Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add pawel-cell/cmux-ai-agents-bundle --skill cmux-skillgit clone --depth 1 https://github.com/pawel-cell/cmux-ai-agents-bundleWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/pawel-cell/cmux-ai-agents-bundle/cmux-skill)<a href="https://agentmods.dev/skills/pawel-cell/cmux-ai-agents-bundle/cmux-skill"><img src="https://agentmods.dev/badge/skills/pawel-cell/cmux-ai-agents-bundle/cmux-skill/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/pawel-cell/cmux-ai-agents-bundle/cmux-skill"><img src="https://agentmods.dev/badge/skills/pawel-cell/cmux-ai-agents-bundle/cmux-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00086 | $0.02338 |
| Opus 5.5 | $0.00034 | $0.00935 |
| Sonnet 5.5 | $0.00017 | $0.00468 |
| Haiku 4.5 | $0.00009 | $0.00234 |
Grade B, and why
cmux scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo ln -sf /Applications/cmux.app/Contents/Resources/bin/cmux /usr/local/bin/cmux How it starts
The opening of the file, as written. The whole thing — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cmux Control
cmux is a native macOS terminal app for running multiple AI coding agents in parallel. It exposes a CLI (cmux) and a Unix-socket JSON-RPC API (/tmp/cmux.sock) for full topology and browser control.
Core Concepts
- Window — top-level macOS cmux window
- Workspace — sidebar tab within a window (one git branch / project context)
- Pane — split region inside a workspace
- Surface — tab inside a pane (terminal or browser)
Handles default to short refs (workspace:2, pane:1, surface:7); UUIDs accepted as input. Add --id-format uuids|both for full IDs in output.
Detect cmux in a Shell
[ -S "${CMUX_SOCKET_PATH:-/tmp/cmux.sock}" ] || exit 0 # bail if not in cmux
[ -n "${CMUX_WORKSPACE_ID:-}" ] && echo "inside cmux surface"
Injected env vars in every cmux-spawned terminal: CMUX_WORKSPACE_ID, CMUX_SURFACE_ID, CMUX_SOCKET_PATH, CMUX_PORT. Always anchor automation to CMUX_WORKSPACE_ID — the visually focused workspace may not be the agent's caller workspace.
Fast Start — Topology
cmux identify --json # who am I (window/workspace/pane/surface)
cmux tree # full hierarchy
cmux list-workspaces --json
cmux list-panes --workspace "$CMUX_WORKSPACE_ID"
cmux list-surfaces --workspace "$CMUX_WORKSPACE_ID"
cmux new-workspace --name "feature-x" --cwd /path/to/repo
cmux new-pane --workspace "$CMUX_WORKSPACE_ID" --type terminal --direction right --focus false
cmux new-pane --workspace "$CMUX_WORKSPACE_ID" --type browser --direction right --url http://localhost:3000
cmux move-surface --surface surface:7 --pane pane:2 --focus false
cmux split-off --surface surface:7 right
cmux reorder-surface --surface surface:7 --before surface:3
cmux close-surface --surface surface:7
Send Input
cmux send "echo hi\n" # focused terminal
cmux send-key "ctrl+c" # enter|tab|esc|backspace|arrows|ctrl+x|shift+tab
cmux send-surface --surface surface:7 "npm run build\n" # specific surface
cmux send-key-surface --surface surface:7 enter
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 174 lines · 86 tokens per session scan B 7842849ce0b3
cmux is a skill published in the GitHub repository pawel-cell/cmux-ai-agents-bundle (42 stars, last pushed 5mo ago), licensed MIT. It adds 86 tokens to every session and 2,338 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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