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 agentmods add instructions/ourobx/agent-ebpf/cross-platform-scriptinggit clone --depth 1 https://github.com/ourobx/agent-ebpfWhat 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 | $0.01327 | $0.01327 |
| Opus 5 | $0.00664 | $0.00664 |
| Sonnet 5 | $0.00265 | $0.00265 |
| Haiku 4.5 | $0.00133 | $0.00133 |
Grade C, and why
agent-ebpf cross-platform-scripting.instructions.md scanned grade C with 1 finding 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 yesterday.
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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- Copilot Instruction Telemetry: This file was auto-generated by Claude Skills Manager --> How it starts
The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cross-platform-scripting
Cross-Platform Scripting
Detect the actual runtime before assuming what syntax/tools are available —
don't write PS7 syntax for a PS5.1 host, or GNU sed flags for macOS.
1. Detect the OS
- PowerShell 6+/7+:
$IsWindows,$IsMacOS,$IsLinux(booleans). - PowerShell 5.1: these variables don't exist — PS5.1 only runs on
Windows, so its mere presence (
$PSVersionTable.PSEdition -eq 'Desktop') implies Windows. - From a POSIX shell:
uname -s→Linux,Darwin(macOS), orMINGW*/MSYS*/CYGWIN*(Git Bash / WSL-adjacent on Windows). - If a project ships parallel scripts (
setup.ps1+setup.sh, or*.cmd+*.ps1), that's a signal contributors use multiple OSes — keep both in sync when changing behavior.
2. Detect PowerShell version before writing/editing .ps1
$PSVersionTable.PSVersion # e.g. 5.1.19041.x or 7.4.x
$PSVersionTable.PSEdition # "Desktop" (5.1) or "Core" (7+)
Check the project's existing scripts for a stated minimum (a comment like
"PS5-compatible" or #Requires -Version 7.0) — match that, don't assume
the latest syntax is fine.
3. PS7+-only syntax to avoid on PS5.1
| Feature | PS7+ | PS5.1-safe equivalent |
|---|---|---|
| Pipeline chain operators | cmd1 && cmd2, cmd1 || cmd2 |
cmd1; if ($?) { cmd2 } |
| Ternary | $x ? $a : $b |
if ($x) { $a } else { $b } |
| Null-coalescing | $a ?? $b, $a ??= $b |
if ($null -eq $a) { $b } else { $a } |
ForEach-Object -Parallel |
available | sequential foreach/ForEach-Object, or Start-Job/runspaces |
Get-Error |
available | inspect $Error[0] / $_.Exception |
&&/|| for native exe stderr capture |
works as expected | redirecting a native command's stderr inside PS5.1 wraps it as a NativeCommandError and can flip $? to $false even on exit 0 — avoid 2>&1 on native exes; capture stdout/stderr separately if needed |
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.
- yesterday First seen · 89 lines · 1,327 tokens per session scan C 65d338243e7b
agent-ebpf cross-platform-scripting.instructions.md is an instructions file published in the GitHub repository ourobx/agent-ebpf (1 stars, last pushed 7d ago), licensed MIT. It adds 1,327 tokens to every session, about $0.0066 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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