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 rules/project-vic-international/agentic-ai-development-course/cross-platformgit clone --depth 1 https://github.com/Project-VIC-International/Agentic-AI-Development-CourseWrote 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/rules/project-vic-international/agentic-ai-development-course/cross-platform)<a href="https://agentmods.dev/rules/project-vic-international/agentic-ai-development-course/cross-platform"><img src="https://agentmods.dev/badge/rules/project-vic-international/agentic-ai-development-course/cross-platform.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 | $0.02221 | $0.02221 |
| Opus 5 | $0.01111 | $0.01111 |
| Sonnet 5 | $0.00444 | $0.00444 |
| Haiku 4.5 | $0.00222 | $0.00222 |
Grade A, and why
cross-platform scanned grade A 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 5d 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- Python: `subprocess.run([...])` with `shell=False`. **Never** use `shell=True` on user-supplied data. How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cross-Platform Compatibility
This tool MUST run on Windows 10/11, Linux (Ubuntu 22.04+, RHEL 8+), and macOS (12+). Law enforcement agencies and digital forensics labs use all three:
- Windows dominates examiner workstations.
- Linux is common on triage servers, processing farms, auto-ingest nodes, and air-gapped lab infrastructure.
- macOS is used by a meaningful subset of examiners.
Code that works only on one OS is incomplete. A feature that is "done on Linux" but breaks on Windows is not done.
This rule applies regardless of language (Python, Rust, Go, JavaScript, etc.). Examples below are mostly Python because the course's reference stack is Python; the principles transfer directly.
Path Handling
- ALWAYS use the standard library's path-handling facility — never concatenate paths with
/or\string literals.- Python:
pathlib.Path(preferred) oros.path.join. - Rust:
std::path::Pathandstd::path::PathBuf. - Go:
path/filepath. - Node:
path.joinfrom thepathmodule.
- Python:
- Use the platform's user-directory facility for config, data, and cache locations — do not hardcode
/home/,~/,C:\Users\, or/Users/.- Python:
platformdirs(preferred) orappdirs. - Rust: the
dirsordirectoriescrate.
- Python:
- Normalize paths before comparison or persistence (Python:
Path.resolve()). - Never assume case-sensitive file systems. Windows (NTFS) and macOS (APFS default) are case-insensitive; Linux is case-sensitive. Case folding for evidence file lookups MUST be explicit, not accidental.
- Use the standard library's temp-file facility for scratch space — never hardcode
/tmp/or%TEMP%.- Python:
tempfile.TemporaryDirectory,tempfile.NamedTemporaryFile. - Rust:
tempfile::tempdir,tempfile::NamedTempFile.
- Python:
- Maximum path length on Windows is 260 characters by default — keep generated artifact paths short and document long-path support (
\\?\prefix or registry opt-in) in your deployment guide.
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.
- 5d ago First seen · 135 lines · 2,221 tokens per session scan A a047bb388035
cross-platform is a cursor rule published in the GitHub repository Project-VIC-International/Agentic-AI-Development-Course (5 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 2,221 tokens to every session, about $0.0111 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other cursor rules, from other repositories
ponytail
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angular-20
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dev-standard
Apache Superset development standards and guidelines for Cursor IDE.
cli-error-handling
CLI command error handling patterns.
prefer-direct-imports-over-module-mocks
Prefer extracting a testable core over vi.mock / vi.resetModules when unit tests need to reach production logic entangled with config, env, or singletons.
control-plane-descriptors
Control plane descriptor and instance implementation patterns.