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 alonf/specrew --skill powershell-gnu-flag-bindinggit clone --depth 1 https://github.com/alonf/specrewWrote 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/alonf/specrew/powershell-gnu-flag-binding)<a href="https://agentmods.dev/skills/alonf/specrew/powershell-gnu-flag-binding"><img src="https://agentmods.dev/badge/skills/alonf/specrew/powershell-gnu-flag-binding.svg" alt="Measured on agentmods" 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 | $0.00028 | $0.00460 |
| Opus 5 | $0.00014 | $0.00230 |
| Sonnet 5 | $0.00006 | $0.00092 |
| Haiku 4.5 | $0.00003 | $0.00046 |
Grade A, and why
powershell-gnu-flag-binding 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 3d 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
Context
Use this when a PowerShell script exposes a GNU-style --* surface but must still run correctly under both pwsh and Windows PowerShell, including powershell -File script.ps1.
Patterns
- Keep
[CmdletBinding(PositionalBinding = $false)]on the script entry point. - Add hyphenated
[Alias()]names for options that PowerShell will not bind natively from--flag valueforms (for exampledry-run,project-path,no-agents). - Retain an explicit remaining-arguments parser for
--flag=valueforms and for host/version combinations that still pass GNU-style tokens through unbound. - Validate both direct invocation (
& .\script.ps1 --flag) and Windows PowerShell-Fileinvocation because their binding behavior differs.
Examples
--dry-run --project-path C:\Work\Demobinds through aliases under Windows PowerShell-File.--agents=allcontinues to flow through the explicit remaining-arguments parser.scripts\specrew-init.ps1combines aliases plusValueFromRemainingArgumentsto cover both forms without rewriting the bootstrap flow.
Anti-Patterns
- Replacing the whole param block with manual string parsing when only a few hyphenated aliases are missing.
- Assuming
pwshand Windows PowerShell treat--flag valuethe same way. - Dropping the fallback parser after adding aliases; that breaks
--flag=valueforms PowerShell still leaves unbound.
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.
- 3d ago First seen · 34 lines · 28 tokens per session scan A dca639fa7860
powershell-gnu-flag-binding is a skill published in the GitHub repository alonf/specrew (54 stars, last pushed 5d ago), licensed MIT. It adds 28 tokens to every session and 460 once invoked, about $0.0001 per session on Opus 5. 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 2026-09-03.
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