Apple Container Test Runner
RustPython/RustPython
Runs RustPython tests inside a Linux container built with Apple's container CLI, so macOS users can compare Linux results with their local ones.
Protect macOS, Ubuntu, Fedora, and Linux/WSL compatibility in this dotfiles repository.
Install Cross Platform Guardian
$ npx skills add wcygan/dotfiles --skill cross-platform-guardian -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install wcygan/dotfiles cross-platform-guardian --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/wcygan/dotfiles.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/cross-platform-guardian .claude/skills/cross-platform-guardian && 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 "cross-platform-guardian" agent skill from https://github.com/wcygan/dotfiles/tree/main/.agents/skills/cross-platform-guardian into .claude/skills/cross-platform-guardian/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-platform-guardian", 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/wcygan/dotfiles/tree/main/.agents/skills/cross-platform-guardianType 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 wcygan/dotfiles --skill cross-platform-guardian -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install wcygan/dotfiles cross-platform-guardian --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wcygan/dotfiles.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/cross-platform-guardian .agents/skills/cross-platform-guardian && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cross-platform-guardian" agent skill from https://github.com/wcygan/dotfiles/tree/main/.agents/skills/cross-platform-guardian into .agents/skills/cross-platform-guardian/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-platform-guardian", 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 wcygan/dotfiles --skill cross-platform-guardian -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install wcygan/dotfiles cross-platform-guardian --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wcygan/dotfiles.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/cross-platform-guardian .cursor/skills/cross-platform-guardian && 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 "cross-platform-guardian" agent skill from https://github.com/wcygan/dotfiles/tree/main/.agents/skills/cross-platform-guardian into .cursor/skills/cross-platform-guardian/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-platform-guardian", 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/wcygan/dotfiles.git --path .agents/skills/cross-platform-guardian--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 wcygan/dotfiles --skill cross-platform-guardian -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install wcygan/dotfiles cross-platform-guardian --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wcygan/dotfiles.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/cross-platform-guardian .gemini/skills/cross-platform-guardian && 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 "cross-platform-guardian" agent skill from https://github.com/wcygan/dotfiles/tree/main/.agents/skills/cross-platform-guardian into .gemini/skills/cross-platform-guardian/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-platform-guardian", 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 wcygan/dotfiles cross-platform-guardianInstalls 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 wcygan/dotfiles --skill cross-platform-guardian -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/wcygan/dotfiles.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/cross-platform-guardian .github/skills/cross-platform-guardian && 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 "cross-platform-guardian" agent skill from https://github.com/wcygan/dotfiles/tree/main/.agents/skills/cross-platform-guardian into .github/skills/cross-platform-guardian/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-platform-guardian", 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 wcygan/dotfiles --skill cross-platform-guardian -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install wcygan/dotfiles cross-platform-guardian --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/wcygan/dotfiles.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/cross-platform-guardian .opencode/skills/cross-platform-guardian && 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 "cross-platform-guardian" agent skill from https://github.com/wcygan/dotfiles/tree/main/.agents/skills/cross-platform-guardian into .opencode/skills/cross-platform-guardian/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cross-platform-guardian", 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
cross-platform-guardian- GitHub stars
- 194
- Token cost
- ~514 tokens
- SKILL.md length
- 239 words
- Files
- 5 (incl. scripts)
- Skills in repo
- 19
- Repo updated
- First seen
- Licence
- None found
At a glance
Protect macOS, Ubuntu, Fedora, and Linux/WSL compatibility in this dotfiles repository.
- Works in 5 steps: Inspect bootstrap.sh, the affected… → Check macOS and Linux/WSL behavior… → Resolve HOME, XDG, CODEX, and platform… → …
- Portability reviews
- SKILL.md covers Outcome, Current Setup Boundary, Review Workflow and Stop Conditions
- Runs Shell scripts from its folder; calls make and nix
What it does
Cross Platform Guardian is an agent skill from wcygan/dotfiles. Protect macOS, Ubuntu, Fedora, and Linux/WSL compatibility in this dotfiles repository. Use for portability reviews, Nix changes, bootstrap changes, and platform test failures.
Its SKILL.md is about 510 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts (for example `README.md`, `REFERENCE.md` and `scripts/audit-compatibility.sh`).
It sits in Testing & QA, covering Failing and flaky tests. It works with Linux, macOS and Python. The repository describes itself as: Configuration for Development Environments.
When your agent uses it
- Portability reviews
- Bootstrap changes
- Platform test failures
Example prompts
- “/cross-platform-guardian”
Requirements
- Python 3
- A Bash shell
- Docker
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Inspect bootstrap.sh, the affected Python module, flake.nix, and the
- Check macOS and Linux/WSL behavior separately. Preserve the macOS package
- Resolve HOME, XDG, CODEX, and platform paths through paths.py. Keep the
- Run make test-pre, then the focused suite: make test-local for links,
- Report platform evidence, skipped checks, and the rollback path. Nix package
What it can do on your machine
Read from SKILL.md and the folder at commit b385ffa. 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
Ships 2 files in scripts/ (Shell), which the agent can run.
Shell commands in SKILL.md call:
makenix
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
Cross Platform Guardian loads about 514 tokens when it runs. Until then it costs about 50 tokens; SKILL.md has 239 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); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 239 words (~514 tokens).
“Keep the setup path reproducible across macOS, Ubuntu, Fedora, and Linux/WSL without hard-coded machine paths or untested platform assumptions.”
- name
- cross-platform-guardian
Files
SKILL.md and 4 other files (scripts) in .agents/skills/cross-platform-guardian of wcygan/dotfiles.
- SKILL.md
- README.md
- REFERENCE.md
- scripts/audit-compatibility.sh
- scripts/test-platform-compatibility.sh
Open the folder on GitHubat commit b385ffa
Compare with similar skills
Cross Platform Guardian 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 |
|---|---|---|---|---|---|---|
| Cross Platform Guardian this skillwcygan/dotfiles | 194 | — | ~514 | Automated safety check: Pass | None | |
| Apple Container Test RunnerRustPython/RustPython | 22k | — | ~467 | Automated safety check: Pass | MIT | |
| Cross Platform Pathsmicrosoft/vscode-python-environments | 141 | — | ~1.5k | Automated safety check: Pass | MIT | |
| Remote Hostslibnativeapi/nativeapi | 164 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Crossreviewcoddy-project/coddy-agent | 168 | — | ~3.3k | Automated safety check: Pass | MIT | |
| Flutter UI Probelibnativeapi/nativeapi | 164 | — | ~988 | Automated safety check: Pass | MIT |
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Build, run, and GUI-test on another machine over SSH — the user's Windows laptop today, Linux or other macOS machines tomorrow — with one symmetric CLI for every OS: push scripts, run them either in…
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Run when the user invokes /crossreview (or /crossreview:setup to choose the reviewers) or asks for a cross-review, a quorum review or a second opinion from other agents or models: fan a code review…
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Related
Categories
Questions about Cross Platform Guardian
What does Cross Platform Guardian do?
Protect macOS, Ubuntu, Fedora, and Linux/WSL compatibility in this dotfiles repository. Cross Platform Guardian is an agent skill from wcygan/dotfiles. Protect macOS, Ubuntu, Fedora, and Linux/WSL compatibility in this dotfiles repository.
When should I use Cross Platform Guardian?
Cross Platform Guardian fits situations like: portability reviews; bootstrap changes; platform test failures.
How do I install Cross Platform Guardian in Claude Code?
Run `npx skills add wcygan/dotfiles --skill cross-platform-guardian -a claude-code`. Or copy the skill folder (.agents/skills/cross-platform-guardian in wcygan/dotfiles) into .claude/skills/cross-platform-guardian in your project. Claude Code loads it when a task matches its description.
How do I install Cross Platform Guardian in Codex?
Run `npx skills add wcygan/dotfiles --skill cross-platform-guardian -a codex`. Or copy the skill folder (.agents/skills/cross-platform-guardian in wcygan/dotfiles) into .agents/skills/cross-platform-guardian in your project. Codex loads it when a task matches its description.
Can I use Cross Platform Guardian 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 wcygan/dotfiles --skill cross-platform-guardian -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cross-platform-guardian, .gemini/skills/cross-platform-guardian, .github/skills/cross-platform-guardian and .opencode/skills/cross-platform-guardian in your project.
What does Cross Platform Guardian need to run?
Going by SKILL.md and its folder, Cross Platform Guardian needs a shell for the scripts in its folder and the command-line tools its instructions call (make and nix). Our summary lists: Python 3; A Bash shell; Docker.
Does Cross Platform Guardian 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 Cross Platform Guardian 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Cross Platform Guardian use?
No licence was found for Cross Platform Guardian or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Cross Platform Guardian use?
About 514 tokens (SKILL.md is roughly 2.1k 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 Cross Platform Guardian?
Skills that share tags, products or a category with Cross Platform Guardian: Apple Container Test Runner (RustPython/RustPython, 22k stars), Cross Platform Paths (microsoft/vscode-python-environments, 141 stars), Remote Hosts (libnativeapi/nativeapi, 164 stars) and Crossreview (coddy-project/coddy-agent, 168 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cross Platform Guardian?
wcygan (a GitHub user) maintains it in wcygan/dotfiles, which has 194 GitHub stars. The repository holds 19 skills in this directory. The repository was last updated on October 8, 2026.
Source: wcygan/dotfiles on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.