How do I install the Powershell skill?

Run npx skillmds@latest add bmaltais/powershell in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Powershell safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Powershell?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Powershell free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Powershell?

bmaltais (@bmaltais) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Powershell by bmaltais — Agent Skill

Name: Powershell
Author: bmaltais

Powershell

PowerShell cmdlet and scripting best practices based on Microsoft guidelines. Use when writing or reviewing PowerShell scripts (.ps1, .psm1). Trigger on phrases like "write a PowerShell function", "review my script", "PowerShell best practices", "cmdlet design", "PS1 style".

bmaltais 9908456 6 files · 13.7 KB Updated Sep 17, 2026

File contents

PowerShell Cmdlet Development

Write idiomatic, safe, and maintainable PowerShell aligned with Microsoft guidelines.

Routing Table

Topic	Reference
Naming (verbs, params, variables, aliases)	`references/naming.md`
Parameter design (types, validation, switches)	`references/parameters.md`
Pipeline, output, and PassThru patterns	`references/pipeline.md`
Error handling, ShouldProcess, safety	`references/errors.md`
Style, documentation, and performance	`references/style.md`

Key Rules (Always Apply)

Verb-Noun format with approved verbs (Get-Verb), PascalCase, singular nouns.
[CmdletBinding()] on every function — enables common parameters.
[switch] for boolean flags — never [bool], never assign defaults.
Exec form for CMD/ENTRYPOINT in containers, exec form analogy: always use full cmdlet names, never aliases in scripts.
Non-interactive — no Read-Host; accept all input via parameters.
Return objects — never formatted text. Use [PSCustomObject] for structured data.
SupportsShouldProcess on any function that modifies state.
Full names — no aliases (Get-ChildItem not gci, Where-Object not ?).
Comment-based help (.SYNOPSIS, .DESCRIPTION, .PARAMETER, .EXAMPLE) on public functions.

Frequently asked questions