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 manaflow-ai/cmux-skills --skill cmux-artifactgit clone --depth 1 https://github.com/manaflow-ai/cmux-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/manaflow-ai/cmux-skills/cmux-artifact)<a href="https://agentmods.dev/skills/manaflow-ai/cmux-skills/cmux-artifact"><img src="https://agentmods.dev/badge/skills/manaflow-ai/cmux-skills/cmux-artifact/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/manaflow-ai/cmux-skills/cmux-artifact"><img src="https://agentmods.dev/badge/skills/manaflow-ai/cmux-skills/cmux-artifact.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00039 | $0.02400 |
| Opus 5.5 | $0.00016 | $0.00960 |
| Sonnet 5.5 | $0.00008 | $0.00480 |
| Haiku 4.5 | $0.00004 | $0.00240 |
Grade A, and why
cmux-artifact scanned grade A 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 2mo 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsS "http://127.0.0.1:<port>/healthz" How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cmux Artifact
Use this skill when the user asks for an HTML artifact, walkthrough, evidence page, demo page, artifact preview, or a workspace layout that helps them dogfood, verify, or understand a change. The goal is a durable, inspectable artifact plus non-disruptive cmux workspace tabs for the important evidence.
Prerequisites
- The caller cmux workspace is the default target, not a requirement. Read the
cmux-workspaceskill when opening panes, tabs, browsers, logs, screenshots, videos, or generated documents.- Default to the caller workspace's right helper pane for task-tied evidence (dogfood proof, failure logs, verification pages) that the user wants next to the work they triggered.
- Prefer a dedicated or new workspace when the artifact is standalone and durable (a design doc, report, or reference page the user will return to), when splitting the caller workspace would crowd an active terminal, or when the user asks for it elsewhere. Create it additively with
cmux new-workspace; only switch to it when the user asked to view the artifact now (an explicit "open it" counts). Never callselect-workspace/focus-panespeculatively. - If unsure which fits, ask, or pick the least-disruptive option and say where you put it so the user can redirect.
- Prefer real command output, logs, screenshots, traces, and timings. Do not invent evidence.
- Keep final user-facing artifacts out of
/tmp.
Artifact Location
Put final artifacts under a branch-scoped durable tree:
BRANCH="$(git -C <worktree-or-repo> branch --show-current 2>/dev/null || echo task)"
ASSET_ROOT="/cmux-assets/${BRANCH:-task}/<artifact-slug>"
mkdir -p "$ASSET_ROOT"
If /cmux-assets cannot be created or written, use cmux-assets/<branch>/<artifact-slug> under the current repo checkout and state that fallback. /tmp is scratch only. Copy accepted logs, screenshots, frames, videos, and transcripts into the durable tree before opening or reporting them.
Workflow
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.
- 2mo ago First seen · 158 lines · 39 tokens per session scan A e5bfd71ff18d
cmux-artifact is a skill published in the GitHub repository manaflow-ai/cmux-skills (38 stars, last pushed 1mo ago), licensed MIT. It adds 39 tokens to every session and 2,400 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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