platform-awareness

A set of instructions for adapting coding tasks to Windows, macOS, or Linux. It tells the agent to identify the operating system and choose suitable file paths and commands.

In plain words
What is it for?
It helps with listing folders, reading and editing files, checking whether files exist, creating folders, and running terminal commands on different systems.
Why use it?
It reduces failures caused by using commands or path formats that work on one operating system but not another.

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/kfnzero/mantis-mcp-server/platform-awareness
Clone the repo
git clone --depth 1 https://github.com/kfnzero/mantis-mcp-server

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 1,119 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin original No closer match found 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 $0.01119
Opus 5 $0.00000 $0.00560
Sonnet 5 $0.00000 $0.00224
Haiku 4.5 $0.00000 $0.00112

Measured 2d ago against content hash 8472277b8753, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

platform-awareness 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 2d 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

| Delete directory | rmdir /s /q dir | rm -rf dir |
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.cursor/rules/Core Implementation/platform-awareness.mdc · 175 lines

How it starts

The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PLATFORM AWARENESS

TL;DR: Always identify the operating system at the beginning of a task. Prefer built-in tools over platform-specific commands when available. When terminal commands are necessary, adapt them according to the platform.

🔧 TOOLS-FIRST APPROACH

Use these built-in tools as your first choice:

  • list_dir - For listing directory contents (instead of dir/ls)
  • edit_file - For creating/editing files (instead of echo/touch)
  • read_file - For examining file contents
  • Use relative paths directly with tools (no cd needed)
  • run_terminal_cmd - For terminal commands (ONE AT A TIME)

🖥️ PLATFORM IDENTIFICATION

At the INITIALIZATION phase of every task, identify the platform:

### Platform Detection
Current environment: [Windows/Mac/Linux]
Path separator: [\ or /]

🚨 KEY PLATFORM DIFFERENCES

Operation Windows Mac/Linux
Path separator \ (backslash) / (forward slash)
Create empty file echo.> filename.txt touch filename.txt
Create nested dirs Create one by one mkdir -p path/to/dir
List directory dir ls
Check if dir exists if exist dir\NUL if [ -d dir ]
Check if file exists if exist file.txt if [ -f file.txt ]
Delete file del file.txt rm file.txt
Delete directory rmdir /s /q dir rm -rf dir

📦 WEB DEVELOPMENT WORKFLOW

For modern web development environments like Vite/React:

NPM Commands (Safe across platforms)

# Installing dependencies
npm install            # Install all dependencies from package.json
npm install react      # Install a single package
npm install react react-dom  # Install multiple packages at once

# Running scripts
npm run dev            # Start development server
npm run build          # Build for production
npm run test           # Run tests

# Creating projects
npm create vite@latest my-app -- --template react

Vite Development (Safe across platforms)

# Starting dev server
cd project-directory
npm run dev

# Building
npm run build

# Previewing build
npm run preview

Read the full file on GitHub · 175 lines

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. 2d ago First seen · 175 lines · 1,119 tokens per session scan C 8472277b8753

Subscribe to this mod's changes

platform-awareness is a cursor rule published in the GitHub repository kfnzero/mantis-mcp-server (10 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,119 tokens. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.