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 boundsj/agent-skills --skill cmuxgit clone --depth 1 https://github.com/boundsj/agent-skillsWrote 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/boundsj/agent-skills/cmux)<a href="https://agentmods.dev/skills/boundsj/agent-skills/cmux"><img src="https://agentmods.dev/badge/skills/boundsj/agent-skills/cmux.svg" alt="Measured on agentmods" 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 | $0.00033 | $0.05394 |
| Opus 5 | $0.00016 | $0.02697 |
| Sonnet 5 | $0.00007 | $0.01079 |
| Haiku 4.5 | $0.00003 | $0.00539 |
Grade A, and why
cmux scanned grade A with 0 findings 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 8d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 469 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cmux Terminal Multiplexer — Agent Integration
Use when orchestrating terminal sessions, running parallel commands, monitoring output, or reporting progress inside cmux. Works for Claude Code, Cursor, and Codex.
Detection
Check for the CMUX_WORKSPACE_ID environment variable. If set, you are inside cmux and can use the cmux CLI. If unset, do NOT attempt any cmux commands.
The CLI binary is at /Applications/cmux.app/Contents/Resources/bin/cmux (also available as cmux on PATH inside cmux terminals).
Environment variables automatically set in cmux terminals:
CMUX_WORKSPACE_ID— current workspace refCMUX_SURFACE_ID— current surface refCMUX_SOCKET_PATH— Unix socket path (usually/tmp/cmux.sock)
Hierarchy
Window > Workspace (sidebar tab) > Pane (split region) > Surface (terminal tab in pane).
Use short refs: workspace:1, pane:1, surface:2.
Core Commands
Orientation
cmux identify --json # get caller context (workspace/surface/pane refs)
cmux list-workspaces # list all workspaces
cmux list-panes # list panes in current workspace
cmux list-pane-surfaces --pane <ref> # list surfaces (tabs) in a pane
Create Terminals
cmux new-workspace --command "cd /path && cmd" # new workspace tab (does NOT switch to it)
cmux new-split <left|right|up|down> # split current pane
cmux new-surface # new tab in current pane
cmux new-pane --direction <dir> # new pane
Send Input / Read Output
cmux send --surface <ref> "text\n" # send text to a surface (include \n for enter)
cmux send-key --surface <ref> <key> # send key (enter, ctrl-c, etc.)
cmux read-screen --surface <ref> --lines <n> # read terminal output (last n lines)
Progress Reporting (shows in cmux sidebar)
cmux set-status <key> <value> --icon <name> --color <#hex>
cmux set-progress <0.0-1.0> --label "text"
cmux log --level <info|success|warning|error> --source "agent" -- "message"
cmux notify --title "Title" --body "Body" # desktop notification
cmux clear-status <key>
cmux clear-progress
cmux clear-log
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.
- 8d ago First seen · 469 lines · 33 tokens per session scan A 51963f864556
cmux is a skill published in the GitHub repository boundsj/agent-skills (2 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 5,394 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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