Borrowing it
Nothing to install: this file belongs to kaltinril/ShadowDusk. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/kaltinril/ShadowDusk/main/.claude/commands/platform-check.mdgit clone --depth 1 https://github.com/kaltinril/ShadowDuskWrote 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/commands/kaltinril/shadowdusk/platform-check)<a href="https://agentmods.dev/commands/kaltinril/shadowdusk/platform-check"><img src="https://agentmods.dev/badge/commands/kaltinril/shadowdusk/platform-check/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/commands/kaltinril/shadowdusk/platform-check"><img src="https://agentmods.dev/badge/commands/kaltinril/shadowdusk/platform-check.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 | $0.00000 | $0.00399 |
| Opus 5.5 | $0.00000 | $0.00160 |
| Sonnet 5.5 | $0.00000 | $0.00080 |
| Haiku 4.5 | $0.00000 | $0.00040 |
Grade A, and why
platform-check scanned grade A with 0 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 1mo 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
/platform-check — Audit code for cross-platform assumptions
Scans the codebase for platform-specific assumptions that would break on Linux or macOS, and reports findings with suggested fixes.
Steps
- Scan for hardcoded path separators:
Search for: \\ used as path separator (not in verbatim strings)
Search for: "/" used to join path segments manually
Flag: any string concatenation with path components
- Scan for Windows-only APIs:
Search for: Registry, RegistryKey
Search for: Environment.SpecialFolder.* (some are Windows-only)
Search for: [SupportedOSPlatform] annotations that may be missing
Search for: P/Invoke to Windows DLLs (kernel32, user32, d3dcompiler)
- Scan for process execution issues:
Search for: .exe hardcoded in binary names
Search for: ProcessStartInfo.Arguments (should use ArgumentList)
Search for: UseShellExecute = true (should be false)
- Scan for temp file issues:
Search for: hardcoded /tmp or C:\Temp
Search for: Path.GetTempPath not used
- Scan for line ending issues:
Search for: \r\n in shader source processing
Search for: string.Split('\n') without .TrimEnd('\r')
- Scan for missing Unix chmod:
Search for: File.Copy or ZipFile.ExtractToDirectory for native binaries
Verify: UnixFileMode.UserExecute is set after extraction on non-Windows
Report format
For each finding:
- File and line number
- The problematic code snippet
- Severity:
BREAK(will fail on non-Windows) orWARN(may behave differently) - Suggested fix
End with a summary count: N BREAK, M WARN issues found.
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.
- 1mo ago First seen · 55 lines · 0 tokens per session scan A e6cb4f4db413
platform-check is a command published in the GitHub repository kaltinril/ShadowDusk (19 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 399 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.
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