platform-awareness

Guidance for detecting the operating system, path style, and shell, then adapting commands for Windows, macOS, or Linux.

In plain words
What is it for?
Use it when writing cross-platform instructions, converting paths, choosing shell commands, or checking whether PowerShell, Bash, Zsh, or another shell is active.
Why use it?
The same command or file path may not work across operating systems, which can cause setup and automation failures.

Cursor rule for Cursor

Install

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.

agentmods
npx agentmods add rules/alkoleft/platform-context-exporter/platform-awareness
Clone the repo
git clone --depth 1 https://github.com/alkoleft/platform-context-exporter

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 462 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00462
Opus 5 $0.00000 $0.00231
Sonnet 5 $0.00000 $0.00092
Haiku 4.5 $0.00000 $0.00046

Measured 3d ago against content hash 3f58dbf8f24e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

platform-awareness 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.

Origin

This is a copy

100% identical to platform-awareness — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.cursor/rules/isolation_rules/Core/platform-awareness.mdc · 71 lines

What it actually says

PLATFORM AWARENESS SYSTEM

TL;DR: This system detects the operating system, path format, and shell environment, then adapts commands accordingly to ensure cross-platform compatibility.

🔍 PLATFORM DETECTION PROCESS

graph TD
    Start["Start Platform<br>Detection"] --> DetectOS["Detect OS<br>Environment"]
    DetectOS --> Windows["Windows<br>Detection"]
    DetectOS --> Mac["macOS<br>Detection"]
    DetectOS --> Linux["Linux<br>Detection"]
    
    Windows & Mac & Linux --> PathCheck["Path Separator<br>Detection"]
    PathCheck --> CmdAdapt["Command<br>Adaptation"]
    CmdAdapt --> ShellCheck["Shell Type<br>Detection"]
    ShellCheck --> Complete["Platform Detection<br>Complete"]

📋 PLATFORM DETECTION IMPLEMENTATION

For reliable platform detection:

## Platform Detection Results
Operating System: [Windows/macOS/Linux]
Path Separator: [\ or /]
Shell Environment: [PowerShell/Bash/Zsh/Cmd]
Command Adaptation: [Required/Not Required]

Adapting commands for [detected platform]...

🔍 PATH FORMAT CONVERSION

When converting paths between formats:

sequenceDiagram
    participant Input as Path Input
    participant Detector as Format Detector
    participant Converter as Format Converter
    participant Output as Adapted Path
    
    Input->>Detector: Raw Path
    Detector->>Detector: Detect Current Format
    Detector->>Converter: Path + Current Format
    Converter->>Converter: Apply Target Format
    Converter->>Output: Platform-Specific Path

📝 PLATFORM VERIFICATION CHECKLIST

✓ PLATFORM VERIFICATION
- Operating system correctly identified? [YES/NO]
- Path separator format detected? [YES/NO]
- Shell environment identified? [YES/NO]
- Command set adapted appropriately? [YES/NO]
- Path format handling configured? [YES/NO]

→ If all YES: Platform adaptation complete
→ If any NO: Run additional detection steps
Changes

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.

  1. 3d ago First seen · 71 lines · 0 tokens per session scan A 3f58dbf8f24e

Subscribe to this mod's changes

platform-awareness is a cursor rule published in the GitHub repository alkoleft/platform-context-exporter (48 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 462 tokens. A static security scan graded it A with 0 findings. It is 100% identical to platform-awareness, differing in 0 lines, and is treated as a copy.