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Agent skill

Cmux Debugging Guide

by manaflow-ai in manaflow-ai/cmux

Covers debug logging, the Debug menu, profiling rules and runtime pitfalls for working on the cmux macOS terminal app.

Custom licenceAuto-check passedDevelopment

Install Cmux Debugging Guide

skills CLI
$ npx skills add manaflow-ai/cmux --skill cmux-debugging -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install manaflow-ai/cmux cmux-debugging --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cmux-debugging .claude/skills/cmux-debugging && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
cmux-debugging
GitHub stars
28k
Used in
1 other repo
Token cost
~1.1k tokens
SKILL.md length
466 words
Files
4 (incl. references)
Skills in repo
22
Repo updated
First seen
Licence
Custom licence

At a glance

Covers debug logging, the Debug menu, profiling rules and runtime pitfalls for working on the cmux macOS terminal app.

  • Adding temporary debug probes for focus, tab or split events in cmux
  • SKILL.md covers Debug event log, Profiling, Debug menu and Runtime pitfalls, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Diagnosing UI or runtime issues in terminal rendering and tab or sidebar lists

What it does

The skill tells the agent where debug instrumentation belongs in cmux: the unified DEBUG build log, which records key, mouse, focus, split and tab events. Most probes are temporary and removed before merge. The log is followed with tail and lands in /tmp/cmux-debug.log, or a per-tag file for tagged builds. Calls to cmuxDebugLog are timestamped, backed by a 500-entry ring buffer and must be wrapped in #if DEBUG, and stable event prefixes such as focus.panel, tab.select and pane.drop are listed.

For profiling, the agent attaches to a tagged build's pid with xctrace record or sample, never launches under xctrace or Instruments, and never quits, kills or relaunches the user's running cmux, because it holds live agent sessions. DEBUG builds get a Debug menu, and a new debug window is an NSWindowController subclass registered under Debug Windows and backed by a SwiftUI view with AppStorage bindings.

Runtime pitfalls include declaring custom drag-and-drop UTTypes in Info.plist under UTExportedTypeDeclarations. The description also points to typing-latency-sensitive paths, SwiftUI list snapshot boundaries and OS-version repros, with further notes in reference files on the event log and runtime pitfalls.

When your agent uses it

  • Adding temporary debug probes for focus, tab or split events in cmux
  • Diagnosing UI or runtime issues in terminal rendering and tab or sidebar lists
  • Adding a new window to the Debug menu
  • Profiling a tagged cmux build without disturbing the running app

Example prompts

  • “Add debug logging for tab drag and drop in cmux and show me how to tail the log.”
  • “Profile the tagged build for typing latency by attaching xctrace.”
  • “Add a new tuning panel under Debug Windows for sidebar colors.”

Requirements

  • A checkout of the cmux repository on macOS
  • xctrace or sample for profiling

What it can do on your machine

Read from SKILL.md and the folder at commit 6e85139. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cmux Debugging Guide loads about 1.1k tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 85 tokens; SKILL.md has 466 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~85
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 466 words (~1,120 tokens).

“Put debug event instrumentation (keys, mouse, focus, splits, tabs) in the unified DEBUG build log. This is not a requirement to log every new code path; most probes belong to a dogfood debug loop and are removed before merge.”

— opening of SKILL.md by manaflow-ai, Custom licence
name
cmux-debugging

Read the full SKILL.md on GitHub

Files

SKILL.md and 3 other files (references) in skills/cmux-debugging of manaflow-ai/cmux.

  • SKILL.md
  • agents/openai.yaml
  • references/debug-event-log.md
  • references/runtime-pitfalls.md

Open the folder on GitHubat commit 6e85139

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in manaflow-ai/cmux, which our catalogue first saw on October 7, 2026.

Compare with similar skills

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Swiftui Debuggingst0012/cctop154—~2kAutomated safety check: PassMIT
OpenLogi macOS Permissions TriageAprilNEA/OpenLogi23k—~2.5kAutomated safety check: NotesApache-2.0
Electron Heap Snapshot Analysiskeybase/client9.3k—~875Automated safety check: PassBSD-3-Clause

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Works with

Categories

Questions about Cmux Debugging Guide

What does Cmux Debugging Guide do?

Covers debug logging, the Debug menu, profiling rules and runtime pitfalls for working on the cmux macOS terminal app. The skill tells the agent where debug instrumentation belongs in cmux: the unified DEBUG build log, which records key, mouse, focus, split and tab events. Most probes are temporary and removed before merge.

When should I use Cmux Debugging Guide?

Cmux Debugging Guide fits situations like: adding temporary debug probes for focus, tab or split events in cmux; diagnosing UI or runtime issues in terminal rendering and tab or sidebar lists; adding a new window to the Debug menu; profiling a tagged cmux build without disturbing the running app.

How do I install Cmux Debugging Guide in Claude Code?

Run `npx skills add manaflow-ai/cmux --skill cmux-debugging -a claude-code`. Or copy the skill folder (skills/cmux-debugging in manaflow-ai/cmux) into .claude/skills/cmux-debugging in your project. Claude Code loads it when a task matches its description.

How do I install Cmux Debugging Guide in Codex?

Run `npx skills add manaflow-ai/cmux --skill cmux-debugging -a codex`. Or copy the skill folder (skills/cmux-debugging in manaflow-ai/cmux) into .agents/skills/cmux-debugging in your project. Codex loads it when a task matches its description.

Can I use Cmux Debugging Guide in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add manaflow-ai/cmux --skill cmux-debugging -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cmux-debugging, .gemini/skills/cmux-debugging, .github/skills/cmux-debugging and .opencode/skills/cmux-debugging in your project.

What does Cmux Debugging Guide need to run?

SKILL.md names no scripts, command-line tools or credentials: Cmux Debugging Guide is instructions for the agent only. Our summary lists: A checkout of the cmux repository on macOS; xctrace or sample for profiling.

Does Cmux Debugging Guide access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Cmux Debugging Guide safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Cmux Debugging Guide use?

Cmux Debugging Guide has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Cmux Debugging Guide use?

About 1.1k tokens (SKILL.md is roughly 4.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.2k tokens, read only when the agent opens those files.

What are the alternatives to Cmux Debugging Guide?

Skills that share tags, products or a category with Cmux Debugging Guide: Swiftdata Architecture (KartikLabhshetwar/better-shot, 2.4k stars), Dotnet Debugging (novotnyllc/dotnet-artisan, 233 stars), Swiftui Debugging (st0012/cctop, 154 stars) and OpenLogi macOS Permissions Triage (AprilNEA/OpenLogi, 23k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cmux Debugging Guide?

manaflow-ai (a GitHub organization) maintains it in manaflow-ai/cmux, which has 27,681 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 7, 2026.

Source: manaflow-ai/cmux on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.