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 dansasser/claude-code-marketplace --skill xplat-checksgit clone --depth 1 https://github.com/dansasser/claude-code-marketplaceWrote 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/dansasser/claude-code-marketplace/xplat-checks)<a href="https://agentmods.dev/skills/dansasser/claude-code-marketplace/xplat-checks"><img src="https://agentmods.dev/badge/skills/dansasser/claude-code-marketplace/xplat-checks/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/dansasser/claude-code-marketplace/xplat-checks"><img src="https://agentmods.dev/badge/skills/dansasser/claude-code-marketplace/xplat-checks.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 | $0.00035 | $0.00644 |
| Opus 5 | $0.00017 | $0.00322 |
| Sonnet 5 | $0.00007 | $0.00129 |
| Haiku 4.5 | $0.00003 | $0.00064 |
Grade C, and why
xplat-checks scanned grade C with 2 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 9d 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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
| Shell command | `os.system("rm -rf x")` | `shutil.rmtree("x")` | Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- os.system() calls How it starts
The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cross-Platform Checks Skill
Scripts for detecting cross-platform compatibility issues in Python code.
Scripts
check_paths.py
Detect hardcoded path separators.
python .claude/skills/xplat-checks/scripts/check_paths.py [directory]
Finds:
- Hardcoded forward slashes in string paths
- Hardcoded backslashes
- Forward slashes inside os.path.join()
check_line_endings.py
Detect line ending issues.
python .claude/skills/xplat-checks/scripts/check_line_endings.py [directory]
Finds:
- Files with CRLF line endings
- Mixed line endings in single file
- Missing .gitattributes
check_env_vars.py
Find platform-specific environment variable usage.
python .claude/skills/xplat-checks/scripts/check_env_vars.py [directory]
Finds:
- $HOME, $USER (Unix-only)
- %USERPROFILE%, %USERNAME%, %TEMP% (Windows-only)
check_case_sensitivity.py
Detect case sensitivity issues.
python .claude/skills/xplat-checks/scripts/check_case_sensitivity.py [directory]
Finds:
- Files differing only by case
- Import statements with wrong case
check_shell_commands.py
Detect shell command compatibility issues.
python .claude/skills/xplat-checks/scripts/check_shell_commands.py [directory]
Finds:
- os.system() calls
- subprocess with shell=True
- Bash-specific commands
check_temp_paths.py
Find hardcoded temp directory paths.
python .claude/skills/xplat-checks/scripts/check_temp_paths.py [directory]
Finds:
- /tmp references
- C:\Temp references
- /var/tmp references
Output Format
All scripts output JSON:
{
"status": "PASS|FAIL",
"files_scanned": 156,
"issues": [
{
"file": "src/config.py",
"line": 47,
"column": 12,
"issue": "Hardcoded forward slash in path",
"code": "config_path = 'data/config.yaml'",
"suggestion": "Use Path('data') / 'config.yaml'"
}
]
}
Fix Reference
| Issue | Bad | Good |
|---|---|---|
| Path separator | "data/file.txt" |
Path("data") / "file.txt" |
| Home directory | os.environ["HOME"] |
Path.home() |
| Temp directory | "/tmp/file" |
Path(tempfile.gettempdir()) / "file" |
| Shell command | os.system("rm -rf x") |
shutil.rmtree("x") |
| Username | os.environ["USER"] |
getpass.getuser() |
What ships with it
6 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.
- 9d ago First seen · 118 lines · 35 tokens per session scan C 00010f1accda
xplat-checks is a skill published in the GitHub repository dansasser/claude-code-marketplace (9 stars, last pushed 4mo ago), licensed MIT. It adds 35 tokens to every session and 644 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 2 findings (recursive force delete, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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