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-custom-sidebargit 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-custom-sidebar)<a href="https://agentmods.dev/skills/disler/learning-cmux-with-agents/cmux-custom-sidebar"><img src="https://agentmods.dev/badge/skills/disler/learning-cmux-with-agents/cmux-custom-sidebar/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-custom-sidebar"><img src="https://agentmods.dev/badge/skills/disler/learning-cmux-with-agents/cmux-custom-sidebar.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 24 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00085 | $0.01689 |
| Opus 5 | $0.00043 | $0.00844 |
| Sonnet 5 | $0.00017 | $0.00338 |
| Haiku 4.5 | $0.00009 | $0.00169 |
Grade A, and why
cmux-custom-sidebar 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 13d 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 -fsSL https://raw.githubusercontent.com/manaflow-ai/cmux/main/docs/custom-sidebars.md How it starts
The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cmux Custom Sidebar
cmux renders custom sidebars from a small SwiftUI-style file at runtime: no Xcode, no build step, no signing. The file hot-reloads on save, binds to live cmux state (workspaces, tabs, git, PRs, clock), and can run real cmux commands on tap.
The person asking is usually describing a result ("a sidebar that shows my workspaces and lets me jump between them"), not an implementation. Turn that into a clean, native-looking sidebar and make the engineering decisions for them. Do not ask them about SwiftUI, files, or syntax.
Full reference
This skill is the workflow summary. The complete authoring contract (every supported view, modifier, language feature, and data field) is one command away; read it before writing a non-trivial sidebar:
cmux docs sidebars
curl -fsSL https://raw.githubusercontent.com/manaflow-ai/cmux/main/docs/custom-sidebars.md
Workflow
- Enable the beta (once). Custom sidebars are behind Settings → Beta features → Custom sidebars (
customSidebars.beta.enabled). If a written sidebar does not appear in the picker, this flag is the first thing to check. - Write a named file. The name becomes the menu label; use short kebab-case:
The file is a single SwiftUI-style view expression (no~/.config/cmux/sidebars/<name>.swiftstruct, novar body, no imports). A.jsonvariant exists for static layouts; prefer.swiftfor anything dynamic. - Validate and select it:
The user can also pick it manually: right-click the sidebar toggle button.cmux sidebar validate <name> # parse/interpret check with real data shapes cmux sidebar select <name> # switch the sidebar to it - Iterate. Saving the file hot-reloads the sidebar in place (
cmux sidebar reloadforces it). Look at the result, fix what looks off, and verify rows show real data and taps do the right thing before declaring it done.
Authoring rules
- Default to live data. Bind to the
workspacescontext instead of hard-coding text so the sidebar stays correct on its own. - Make it interactive by default. Rows that represent something openable should run the matching
cmux(...)action on tap. A list that just displays text is rarely what they wanted. - Prefer
Reorderablefor workspace-like lists. It gives persisted drag-and-drop reordering for free. - Keep it native and uncluttered: a title, a divider, then the content.
- Cap long lists (
.prefix(20), filter/sort before rendering). The sidebar re-evaluates about once a second; do not render hundreds of rows. - Stay inside the supported subset. Unsupported syntax is skipped gracefully (never crashes), but choose the closest supported approach rather than shipping a half-blank sidebar.
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.
- 13d ago First seen · 93 lines · 85 tokens per session scan A 708dea7dace8
cmux-custom-sidebar is a skill published in the GitHub repository disler/learning-cmux-with-agents (110 stars, last pushed 2mo ago), licensed MIT. It adds 85 tokens to every session and 1,689 once invoked, about $0.0004 per session on Opus 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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