Cmux Debugging Guide
manaflow-ai/cmux
Covers debug logging, the Debug menu, profiling rules and runtime pitfalls for working on the cmux macOS terminal app.
Verifies ccusage terminal output in a real cmux pane. An agent skill from ccusage/ccusage.
Custom licenceAuto-check passed
Install Cmux Debug
$ npx skills add ccusage/ccusage --skill cmux-debug -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ccusage/ccusage cmux-debug --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/cmux-debug .claude/skills/cmux-debug && rm -rf skills-srcUse ~/.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/
Install the "cmux-debug" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/cmux-debug into .claude/skills/cmux-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-debug", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/ccusage/ccusage/tree/main/.agents/skills/cmux-debugType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add ccusage/ccusage --skill cmux-debug -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ccusage/ccusage cmux-debug --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/cmux-debug .agents/skills/cmux-debug && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cmux-debug" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/cmux-debug into .agents/skills/cmux-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-debug", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ccusage/ccusage --skill cmux-debug -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ccusage/ccusage cmux-debug --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/cmux-debug .cursor/skills/cmux-debug && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "cmux-debug" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/cmux-debug into .cursor/skills/cmux-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-debug", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/ccusage/ccusage.git --path .agents/skills/cmux-debug--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add ccusage/ccusage --skill cmux-debug -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ccusage/ccusage cmux-debug --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/cmux-debug .gemini/skills/cmux-debug && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "cmux-debug" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/cmux-debug into .gemini/skills/cmux-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-debug", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install ccusage/ccusage cmux-debugInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add ccusage/ccusage --skill cmux-debug -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/cmux-debug .github/skills/cmux-debug && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "cmux-debug" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/cmux-debug into .github/skills/cmux-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-debug", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ccusage/ccusage --skill cmux-debug -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ccusage/ccusage cmux-debug --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/cmux-debug .opencode/skills/cmux-debug && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "cmux-debug" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/cmux-debug into .opencode/skills/cmux-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-debug", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
cmux-debug- GitHub stars
- 19k
- Token cost
- ~466 tokens
- SKILL.md length
- 177 words
- Files
- 1
- Skills in repo
- 17
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Verifies ccusage terminal output in a real cmux pane. An agent skill from ccusage/ccusage.
- Changing responsive tables
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- A long-running commands output must be captured beyond the visible viewport
What it does
Cmux Debug is an agent skill from ccusage/ccusage. Verifies ccusage terminal output in a real cmux pane. Use when changing responsive tables, column widths, progress bars, spinners, or colors, or when a long-running command's output must be captured beyond the visible viewport.
Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
When your agent uses it
- Changing responsive tables
- A long-running commands output must be captured beyond the visible viewport
Example prompts
- “Use the cmux-debug skill to verify ccusage terminal output in a real cmux pane. An agent skill from ccusage/ccusage”
- “/cmux-debug”
What it can do on your machine
Read from SKILL.md and the folder at commit d2fd844. 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 Debug loads about 466 tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 177 words of instructions outside code blocks.
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 177 words (~466 tokens).
“Piped stdout is not a terminal: width detection, color, progress, and spinners all take a different branch, so a non-interactive run cannot confirm a rendering change. Run the command inside a cmux surface and read the pane back instead.”
- name
- cmux-debug
Files
Just SKILL.md in .agents/skills/cmux-debug of ccusage/ccusage.
Open the folder on GitHubat commit d2fd844
Compare with similar skills
Cmux Debug next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Cmux Debug this skillccusage/ccusage | 19k | — | ~466 | Automated safety check: Pass | Custom licence | |
| Cmux Debugging Guidemanaflow-ai/cmux | 28k | 1 repos | ~1.1k | Automated safety check: Pass | Custom licence | |
| Debugasgeirtj/system_prompts_leaks | 69k | — | ~439 | Automated safety check: Pass | CC0-1.0 | |
| Cmuxsickn33/agentic-awesome-skills | 47k | 1 repos | ~3.5k | Automated safety check: Notes | MIT | |
| Debugging Toolkitsickn33/agentic-awesome-skills | 47k | 1 repos | ~344 | Automated safety check: Pass | MIT | |
| Hypothesis-Driven Debuggingcode-yeongyu/oh-my-openagent | 70k | — | ~3.2k | Automated safety check: Pass | Custom licence |
Similar skills
Debug
asgeirtj/system_prompts_leaks
Enable debug logging for this session and help diagnose issues
Cmux
sickn33/agentic-awesome-skills
Control cmux workspaces, panes, surfaces, and agent sessions safely from macOS terminal workflows.
Debugging Toolkit
sickn33/agentic-awesome-skills
A skill your agent uses when working with debugging toolkit smart debug (Alias for debugging-toolkit-smart-debug)
Hypothesis-Driven Debugging
code-yeongyu/oh-my-openagent
Runs a hypothesis-driven debugging loop for crashes, hangs and silent failures in any language, grounding every claim in runtime evidence and locking the fix with a test.
Aoti Debug
pytorch/pytorch
Debug AOTInductor (AOTI) errors and crashes. An agent skill from pytorch/pytorch.
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Questions about Cmux Debug
What does Cmux Debug do?
Verifies ccusage terminal output in a real cmux pane. An agent skill from ccusage/ccusage. Cmux Debug is an agent skill from ccusage/ccusage. Verifies ccusage terminal output in a real cmux pane.
When should I use Cmux Debug?
Cmux Debug fits situations like: changing responsive tables; A long-running commands output must be captured beyond the visible viewport.
How do I install Cmux Debug in Claude Code?
Run `npx skills add ccusage/ccusage --skill cmux-debug -a claude-code`. Or copy the skill folder (.agents/skills/cmux-debug in ccusage/ccusage) into .claude/skills/cmux-debug in your project. Claude Code loads it when a task matches its description.
How do I install Cmux Debug in Codex?
Run `npx skills add ccusage/ccusage --skill cmux-debug -a codex`. Or copy the skill folder (.agents/skills/cmux-debug in ccusage/ccusage) into .agents/skills/cmux-debug in your project. Codex loads it when a task matches its description.
Can I use Cmux Debug 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 ccusage/ccusage --skill cmux-debug -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-debug, .gemini/skills/cmux-debug, .github/skills/cmux-debug and .opencode/skills/cmux-debug in your project.
What does Cmux Debug need to run?
SKILL.md names no scripts, command-line tools or credentials: Cmux Debug is instructions for the agent only.
Does Cmux Debug 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 Debug 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 Debug use?
Cmux Debug 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 Debug use?
About 466 tokens (SKILL.md is roughly 1.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Cmux Debug?
Skills that share tags, products or a category with Cmux Debug: Cmux Debugging Guide (manaflow-ai/cmux, 28k stars), Debug (asgeirtj/system_prompts_leaks, 69k stars), Cmux (sickn33/agentic-awesome-skills, 47k stars) and Debugging Toolkit (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cmux Debug?
ccusage (a GitHub organization) maintains it in ccusage/ccusage, which has 18,901 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 7, 2026.
Source: ccusage/ccusage on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.