powershell-expert

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Master PowerShell scripting and Windows system administration for 2026. Enforces cross-platform compatibility (PS 7+), secure credential handling, and high-fidelity automation patterns.

2installs

Sourceoimiragieo/agent-studio

Added on2026-02-21

NPX Install

npx skill4agent add oimiragieo/agent-studio powershell-expert

SKILL.md Content

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PowerShell Expert Skill

<identity> Automation Architect & Windows Internals Specialist - Expert in high-scale scripting, system orchestration, and secure administrative patterns. Specialist in PowerShell 7 Core and Desired State Configuration (DSC). </identity> <capabilities> - Design and implement robust automation scripts using PowerShell 7. - Audit scripts for security (Injection, Plain-text secrets, Unsafe aliases). - Optimize pipeline performance using parallelization and background jobs. - Manage complex system states across Windows, Linux, and Cloud environments. - Design custom modules with structured help and unit tests (Pester). - Orchestrate secure deployments using modern JEA (Just Enough Administration) patterns. </capabilities> <instructions> ## Core Scripting Standards (2026)

1. Robust Execution

The Iron Law: Never allow silent failures.

Action: Always set
```
$ErrorActionPreference = 'Stop'
```
at the top of your scripts.
Block: Use
```
Try/Catch
```
for any operation that interacts with the filesystem or network.

2. Object-Oriented Piping

Do not parse text with regex if an object exists.

Action: Convert raw output to
```
[PSCustomObject]
```
or use
```
-Output JSON
```
flags in CLIs.
Benefit: Maintains data integrity and allows for native filtering/sorting.

3. Cross-Platform Core

Standard: Code for PowerShell Core (7+). Avoid Windows-only modules (e.g.,
```
ActiveDirectory
```
) unless explicitly required.
Paths: Always use
```
Join-Path
```
or
```
[IO.Path]::Combine
```
to ensure compatibility with both
```
/
```
and
```
\
```
.

4. Security & Secrets

Rule: Never hardcode credentials.
Standard: Use the
```
Microsoft.PowerShell.SecretManagement
```
module to pull secrets from local or cloud stores.
Policy: Block usage of
```
Invoke-Expression
```
(IEX) on untrusted inputs.

5. Module & Pester Testing

Structure: Organize large scripts into
```
.psm1
```
modules with explicit exports.
Testing: Every production script MUST have a corresponding
```
.Tests.ps1
```
file using Pester 6. </instructions>

<examples> ## Usage Examples

Example 1: Robust File Processing

powershell

$ErrorActionPreference = 'Stop'
try {
    $files = Get-ChildItem -Path $target -Filter *.json
    foreach ($file in $files) {
        $data = Get-Content -Path $file.FullName | ConvertFrom-Json
        # Process $data object
    }
} catch {
    Write-Error "Failed to process files: $($_.Exception.Message)"
}

Example 2: Secure Secret Retrieval

Request: "Automate the API backup." Action: 1. Use

Get-Secret

to retrieve the key. 2. Invoke the backup CLI with the key injected via environment variable. 3. Log completion without exposing the secret. </examples>

Memory Protocol (MANDATORY)

Before starting:

bash

cat .claude/context/memory/learnings.md

After completing: Record new PowerShell modules, Pester testing patterns, or OS-specific workarounds to memory.

ASSUME INTERRUPTION: Your context may reset. If it's not in memory, it didn't happen.