Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/disler/learning-cmux-with-agentsnpx agentmods add skills/disler/learning-cmux-with-agents/cmux-workspaceWrote 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/disler/learning-cmux-with-agents/cmux-workspace)<a href="https://agentmods.dev/skills/disler/learning-cmux-with-agents/cmux-workspace"><img src="https://agentmods.dev/badge/skills/disler/learning-cmux-with-agents/cmux-workspace/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/disler/learning-cmux-with-agents/cmux-workspace"><img src="https://agentmods.dev/badge/skills/disler/learning-cmux-with-agents/cmux-workspace.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00043 | $0.02495 |
| Opus 5 | $0.00022 | $0.01247 |
| Sonnet 5 | $0.00009 | $0.00499 |
| Haiku 4.5 | $0.00004 | $0.00249 |
Grade A, and why
cmux-workspace scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- cmux-workspace — 100% identical, 4 lines differ
How it starts
The opening of the file, as written. The whole thing — 226 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cmux Workspace
Use this skill when a task should be scoped to the cmux workspace that invoked the agent. A workspace is the sidebar tab-like unit in cmux. It contains split panes, and each pane contains one or more surfaces. A surface is the terminal or browser session the user interacts with.
Default Rule
Scope actions to the current caller workspace unless the user explicitly asks for another workspace, another window, or global state.
Do not assume the visually focused cmux workspace is the right target. An agent can be running in one workspace while the user is looking at another. Prefer the caller environment first:
printf 'workspace=%s\nsurface=%s\nsocket=%s\n' \
"${CMUX_WORKSPACE_ID:-}" \
"${CMUX_SURFACE_ID:-}" \
"${CMUX_SOCKET_PATH:-}"
cmux identify --json
Use CMUX_WORKSPACE_ID as the default workspace anchor and CMUX_SURFACE_ID as the default caller terminal/surface anchor. If those are missing, use cmux identify --json and be explicit that you are using the currently focused cmux context.
Non-Disruptive Automation
The user may be visually focused on a different workspace, window, or app while an agent works in the caller workspace. Treat layout and focus as separate concerns. Never call focus-changing verbs speculatively.
Never call these without an explicit user ask:
select-workspaceswitches the visible sidebar tab.focus-pane/focus-panelyanks pane or surface focus.tab-actionwith focus-changing actions.
These are user-affecting actions, like clicks. The rule applies even inside the caller's own workspace, since the user may be looking elsewhere.
Build layout additively, in one shot. Prefer commands that create a new pane already populated with the right surface:
# pane and content in one call, no follow-up needed
cmux new-pane --workspace "${CMUX_WORKSPACE_ID}" --type browser --direction right --url "http://127.0.0.1:8765"
cmux new-pane --workspace "${CMUX_WORKSPACE_ID}" --type terminal --direction down
What ships with it
2 files 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.
- 11d ago First seen · 226 lines · 43 tokens per session scan A 5f8c0b41951b
cmux-workspace is a skill published in the GitHub repository disler/learning-cmux-with-agents (109 stars, last pushed 2mo ago), licensed MIT. It adds 43 tokens to every session and 2,495 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 2026-08-30.
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