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 disler/learning-cmux-with-agents --skill cmux-socket-policygit clone --depth 1 https://github.com/disler/learning-cmux-with-agentsWrote 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-socket-policy)<a href="https://agentmods.dev/skills/disler/learning-cmux-with-agents/cmux-socket-policy"><img src="https://agentmods.dev/badge/skills/disler/learning-cmux-with-agents/cmux-socket-policy/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-socket-policy"><img src="https://agentmods.dev/badge/skills/disler/learning-cmux-with-agents/cmux-socket-policy.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 | $0.00050 | $0.00343 |
| Opus 5 | $0.00025 | $0.00171 |
| Sonnet 5 | $0.00010 | $0.00069 |
| Haiku 4.5 | $0.00005 | $0.00034 |
Grade A, and why
cmux-socket-policy 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 10d 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.
What it actually says
cmux Socket Policy
Threading policy
- Do not use
DispatchQueue.main.syncfor high-frequency socket telemetry commands such asreport_*,ports_kick, status/progress updates, or log metadata updates. - For telemetry hot paths, parse and validate arguments off-main.
- Dedupe and coalesce off-main first.
- Schedule minimal UI/model mutation with
DispatchQueue.main.asynconly when needed. - Commands that directly manipulate AppKit/Ghostty UI state are allowed to run on the main actor.
- If adding a new socket command, default to off-main handling and require an explicit reason in code comments when main-thread execution is necessary.
Focus policy
- Socket/CLI commands must not steal macOS app focus.
- Do not activate the app or raise windows unless the command has explicit focus intent.
- Only explicit focus-intent commands may mutate in-app focus/selection.
- Explicit focus-intent commands include
window.focus,workspace.select/next/previous/last,surface.focus,pane.focus/last, browser focus commands, and v1 focus equivalents. - All non-focus commands should preserve the current user focus context while still applying data/model changes.
Detailed reference
- Read references/threading-and-focus.md when adding a command, changing command execution context, or deciding whether focus changes are allowed.
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.
- 10d ago First seen · 28 lines · 50 tokens per session scan A 47580a3f5187
cmux-socket-policy is a skill published in the GitHub repository disler/learning-cmux-with-agents (109 stars, last pushed 2mo ago), licensed MIT. It adds 50 tokens to every session and 343 once invoked, about $0.0003 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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