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 agentmods add skills/tobyilee/toby-plugins/cmuxnpx skills add tobyilee/toby-plugins --skill cmuxgit clone --depth 1 https://github.com/tobyilee/toby-pluginsWhat 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 | $0.00187 | $0.02594 |
| Opus 5 | $0.00093 | $0.01297 |
| Sonnet 5 | $0.00037 | $0.00519 |
| Haiku 4.5 | $0.00019 | $0.00259 |
Grade D, and why
cmux scanned grade D with 2 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 2d 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.
| `cmux: command not found` | Create symlink: `sudo ln -sf "/Applications/cmux.app/Contents/Resources/bin/cmux" /usr/local/bin/cmux` | Reaches for credential fileshighPrivilege escalation
SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.
cmux ssh user@host --identity ~/.ssh/id_ed25519 --no-focus The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
3 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.
- 2d ago First seen · 314 lines · 187 tokens per session scan D 4bea80b8a4d2
cmux is a skill published in the GitHub repository tobyilee/toby-plugins (24 stars, last pushed 1mo ago), with no licence file. It adds 187 tokens to every session and 2,594 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it D with 2 findings (asks for root, reaches for credential files). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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