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Powershell patterns

Skill pablodiazjorge/prompt-forge/.github/skills/powershell-patterns

Drop-in toolkit that gives AI coding agents persistent memory across sessions. Agent Skills, cross-session learning loop, and knowledge persistence. Zero dependencies, no backend.

Install

npx -y skills add pablodiazjorge/prompt-forge --skill powershell-patterns

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PowerShell 5.1 patterns, pitfalls, and best practices for Windows development. Use when running terminal commands, writing PowerShell scripts, working with Node.js/npm on Windows, or encountering PowerShell errors. Covers nvm-windows, Angular template escaping, execution policy, and cmdlet selection.

The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.

SKILL.md

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PowerShell Patterns for Development

Critical Pitfalls

Templates with `{{ }}` — NEVER use Set-Content or heredocs

PowerShell interprets {{ }} as variable interpolation. Use the agent's create_file tool for any file containing {{ }}, ${{}}, or Angular syntax.

# ❌ NEVER:
Set-Content file.html @"<div>{{ title }}</div>"@

# ✅ Always: agent create_file tool
# Editing existing files: replace_string_in_file
# Commands WITHOUT {{ }}: Set-Content with single quotes works fine

nvm-windows

nvm install X.Y.Z does NOT auto-activate → nvm use X.Y.Z is mandatory
nvm list shows installed versions, * = active
Global packages (@angular/cli) are NOT migrated between versions
Requires Admin shell — run PowerShell as Administrator
@angular/cli@22 → Node ^22.22.3 || ^24.15.0 || >=26.0.0

Chaining — NEVER `&&`

&& is not valid in PowerShell 5.1:

npm install; npm run build   # OK
npm install                  # Better: separate commands
npm run build

Execution Policy

Windows 11/10 default to Restricted — .ps1 scripts won't execute.

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned              # Requires admin
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser  # Without admin

Best Practices

Native cmdlets not aliases: Get-ChildItem not ls, Select-String not findstr
Quote paths: "C:\Path With Spaces\file.txt"
Select-Object -First N to limit output
2>$null to suppress stderr
Test-Path before reading/writing
NEVER Start-Sleep — the agent is notified when async commands finish
Remove-Item -Force to delete; Push-Location/Pop-Location to navigate

File Operations Decision Table

Task	Tool
Create file with `{{ }}`	Agent `create_file`
Edit existing file	`replace_string_in_file`
Multiple simultaneous edits	`multi_replace_string_in_file`
Simple script without templates	`Set-Content` with single quotes
Overwrite existing file	`Remove-Item -Force` → `create_file`

Keep looking

Skills are one crate of 328,083. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.