Devops Tooling

Devops Tooling

Comprehensive toolkit for Git workflows, shell scripting, and development automation.

• Leverage native parallel subagent dispatch and 200k+ context windows where available.

When to Use This Skill

Use symptom -> action triggers: when one matches, apply this skill and verify with the protocol below.

• Creating conventional commits and managing Git workflows
• Writing Bash, Zsh, or PowerShell automation scripts
• Configuring CI/CD pipelines (GitHub Actions, Azure DevOps)
• Automating development, testing, or deployment tasks
• Troubleshooting Git conflicts and repository hygiene issues

Part 1: Git Workflows

Conventional Commits

The conventional commit specification provides an easy-to-extend set of rules for creating an explicit commit history.

Commit Format

<type>[optional scope]: <description>

[optional body]

[optional footer(s)]

Types

Breaking Changes

Breaking changes must be indicated by ! after the type/scope, or via BREAKING CHANGE in footer:

feat(api)!: remove deprecated v1 endpoint


feat(api): remove deprecated v1 endpoint

BREAKING CHANGE: v1 endpoints are no longer supported. Use v2.

Good Examples

feat(auth): implement JWT refresh tokens


fix(ui): resolve mobile navigation overlap issue


docs(api): add authentication examples


refactor(user): extract validation logic to separate module


perf(images): implement lazy loading


feat(core)!: change data structure from array to object

Git Operations

Branch Management

git checkout -b feature/PROJ-123/user-auth


git checkout develop


git branch -d feature/PROJ-123/user-auth


git push origin --delete feature/PROJ-123/user-auth


git branch -m new-name


git branch -a

Commit Workflow

git add .


git add file1.ts file2.ts


git add -i


git commit -m "feat(auth): add OAuth2 support"


git commit --amend


git log --oneline --graph --all


git show <commit-hash>

Merge & Rebase

git merge feature/new-feature


git rebase develop


git rebase -i HEAD~3


git rebase --abort
git merge --abort


git rebase --continue
git merge --continue

Handling Conflicts

git status


vim conflicting-file.ts


git add conflicting-file.ts


git commit  # for merges
git rebase --continue  # for rebases

Stashing

git stash push -m "Work in progress"


git stash pop


git stash apply stash@{2}


git stash list


git stash drop stash@{2}


git stash clear

Tagging

git tag -a v1.0.0 -m "Release v1.0.0"


git tag v1.0.0


git tag


git push origin --tags


git push origin v1.0.0


git tag -d v1.0.0


git push origin --delete v1.0.0

Git Diff

git diff


git diff --staged


git diff src/app.ts


git diff HEAD~2 HEAD


git log --oneline v1.0.0..v2.0.0


git diff --stat

Git Configuration

git config --global user.name "Your Name"
git config --global user.email "your@email.com"


git config --global init.defaultBranch main


git config --global commit.gpgsign true


git config --global alias.co checkout
git config --global alias.br branch
git config --global alias.ci commit
git config --global alias.st status


git config --unset user.name


git config --list

Part 2: Shell Scripting (bash/zsh)

General Principles

• Generate clean, simple, and concise code
• Ensure scripts are easily readable and understandable
• Add comments where needed for understanding
• Generate concise echo outputs for execution status
• Avoid unnecessary output and excessive logging

Error Handling & Safety

Enable Strict Mode

Always enable strict mode at the top of scripts:

#!/bin/bash
set -euo pipefail

• -e: Exit on first error
• -u: Treat unset variables as errors
• -o pipefail: Surface pipeline failures

Cleanup with Traps

cleanup() {
    # Remove temporary files
    if [[ -n "${TEMP_DIR:-}" && -d "$TEMP_DIR" ]]; then
        rm -rf "$TEMP_DIR"
    fi

    # Close connections
    if [[ -n "${CONNECTION:-}" ]]; then
        echo "Closing connection..."
        # connection close logic
    fi
}

trap cleanup EXIT


trap 'echo "Interrupted"; cleanup; exit 1' INT TERM

Validate Requirements

validate_requirements() {
    local errors=0

    # Check required variables
    if [[ -z "${RESOURCE_GROUP:-}" ]]; then
        echo "Error: RESOURCE_GROUP environment variable not set" >&2
        ((errors++))
    fi

    # Check required commands
    for cmd in curl jq az; do
        if ! command -v "$cmd" &> /dev/null; then
            echo "Error: $cmd is not installed" >&2
            ((errors++))
        fi
    done

    # Return appropriate exit code
    return $errors
}


if ! validate_requirements; then
    exit 1
fi

Working with Variables

echo "Config: ${CONFIG_FILE:-./config.default.yaml}"


name="World"
echo "Hello, ${name}!"


apps=("app1" "app2" "app3")
for app in "${apps[@]}"; do
    echo "Processing: $app"
done


declare -A config
config[host]="localhost"
config[port]="8080"
echo "Connecting to ${config[host]}:${config[port]}"

Control Flow

if [[ "$OSTYPE" == "linux-gnu"* ]]; then
    echo "Linux detected"
elif [[ "$OSTYPE" == "darwin"* ]]; then
    echo "macOS detected"
else
    echo "Unknown OS"
fi


case "$1" in
    start)
        echo "Starting service..."
        ;;
    stop)
        echo "Stopping service..."
        ;;
    *)
        echo "Usage: $0 {start|stop}"
        exit 1
        ;;
esac


for i in {1..5}; do
    echo "Iteration $i"
done


timeout=30
elapsed=0
while [[ $elapsed -lt $timeout ]]; do
    if check_ready; then
        echo "Service ready"
        break
    fi
    sleep 1
    ((elapsed++))
done

Parsing JSON with jq

result=$(curl -s "https://api.example.com/data")
name=$(echo "$result" | jq -r '.name')
count=$(echo "$result" | jq '.items | length')
first_item=$(echo "$result" | jq -r '.items[0]')


active_users=$(echo "$result" | jq '.users[] | select(.status == "active")')


read -r first_name last_name email <<<$(echo "$result" | jq -r '"\(.firstName) \(.lastName) \(.email)"')


echo "$result" | jq '.count += 1' > updated.json


jq -n \
  --arg name "John" \
  --arg age "30" \
  '{name: $name, age: ($age | tonumber)}'

Parsing Arguments

#!/bin/bash


verbose=0
output_file="output.txt"
config="./config.yaml"


while [[ $# -gt 0 ]]; do
    case $1 in
        -v|--verbose)
            verbose=1
            shift
            ;;
        -o|--output)
            output_file="$2"
            shift 2
            ;;
        -c|--config)
            config="$2"
            shift 2
            ;;
        -h|--help)
            show_help
            exit 0
            ;;
        *)
            echo "Unknown option: $1" >&2
            exit 1
            ;;
    esac
done

echo "Config: $config"
echo "Output: $output_file"
echo "Verbose: $verbose"

File Operations

if [[ -f "$FILE_PATH" ]]; then
    echo "File exists"
fi


if [[ ! -d "$DIR_PATH" ]]; then
    mkdir -p "$DIR_PATH"
fi


mkdir -p ./dir1/dir2


cp -r source_dir/ dest_dir/


rm -f file.txt          # Force delete file
rm -rf directory/       # Recursive delete directory


find . -name "*.py"           # All Python files
find . -type f -name "*.js"   # All JS files (regular files only)
find . -mtime -7              # Modified in last 7 days


temp_file=$(mktemp)
echo "data" > "$temp_file"


rm -f "$temp_file"


temp_dir=$(mktemp -d)


rm -rf "$temp_dir"

Process Management

if pgrep -x "nginx" > /dev/null; then
    echo "Nginx is running"
else
    echo "Nginx is not running"
fi


while pgrep -x "script-name" > /dev/null; do
    sleep 1
done


timeout 30s ./long-running-script.sh || echo "Timed out after 30s"


./script.sh &
job_pid=$!


trap "kill $job_pid 2>/dev/null" EXIT

Logging

#!/bin/bash


LOG_INFO() {
    echo "[INFO] $(date '+%Y-%m-%d %H:%M:%S') $*"
}

LOG_WARN() {
    echo "[WARN] $(date '+%Y-%m-%d %H:%M:%S') $*" >&2
}

LOG_ERROR() {
    echo "[ERROR] $(date '+%Y-%m-%d %H:%M:%S') $*" >&2
}

LOG_DEBUG() {
    if [[ "${DEBUG:-}" == "1" ]]; then
        echo "[DEBUG] $(date '+%Y-%m-%d %H:%M:%S') $*"
    fi
}


LOG_INFO "Starting deployment"
LOG_WARN "This is a warning"
LOG_ERROR "Deployment failed"
LOG_DEBUG "Detailed debugging info"

Part 3: PowerShell Scripting

General Practices

• Use proper cmdlet names instead of aliases (e.g., Get-ChildItem, not dir)
• Quote paths with spaces: "C:\Path With Spaces\file.txt"
• Use ShouldProcess for destructive operations
• Implement proper error handling with try-catch
• Parameterize scripts for reusability

Error Handling

Set-StrictMode -Version Latest


$ErrorActionPreference = "Stop"


try {
    $result = Invoke-RestMethod -Uri "https://api.example.com/data" -Method Get
}
catch [System.Net.WebException] {
    Write-Error "Network error occurred: $($_.Exception.Message)"
    exit 1
}
catch {
    Write-Error "Unexpected error: $($_.Exception.Message)"
    exit 1
}
finally {
    # Cleanup code always runs
    Write-Output "Execution completed"
}


trap {
    Write-Error "Script failed: $_"
    # Cleanup code
    Remove-Variable -Name tempVar -ErrorAction SilentlyContinue
    exit 1
}

Parameter Handling

param(
    [Parameter(Mandatory=$true)]
    [string]$Name,

    [Parameter(Mandatory=$false)]
    [string]$Path = ".",

    [Parameter(Mandatory=$false)]
    [switch]$Verbose,

    [ValidateSet("dev", "staging", "prod")]
    [string]$Environment = "dev"
)

Write-Output "Name: $Name"
Write-Output "Path: $Path"
Write-Output "Environment: $Environment"
Write-Output "Verbose: $Verbose"

Working with Objects

$user = [PSCustomObject]@{
    Name = "John"
    Age = 30
    Email = "john@example.com",
    Address = "123 Main St"
}


Write-Output $user.Name


$user | Add-Member -MemberType NoteProperty -Name "City" -Value "Anytown"


$users | Where-Object { $_.Age -gt 25 }


$users | Select-Object Name, Email


$users | Sort-Object Name


$users | Group-Object City

Working with JSON

$json = '{"name": "John", "age": 30}'
$obj = $json | ConvertFrom-Json

Write-Output $obj.name


$data = @{ name = "John"; age = 30 }
$json = $data | ConvertTo-Json -Depth 10
Write-Output $json


$config = Get-Content "config.json" | ConvertFrom-Json


$config | ConvertTo-Json -Depth 10 | Set-Content "config.json"

Working with Arrays and Hashtables

$files = @("file1.txt", "file2.txt", "file3.txt")


$files += "file4.txt"


$filtered = $files | Where-Object { $_ -like "*.txt" }


$config = @{
    host = "localhost"
    port = 8080
    tls = $true
}


Write-Output $config.host


$key = "port"
Write-Output $config[$key]


foreach ($item in $config.GetEnumerator()) {
    Write-Output "$($item.Name) = $($item.Value)"
}

File Operations

if (Test-Path "C:\path\to\file.txt") {
    Write-Output "File exists"
}


New-Item -ItemType Directory -Path "C:\new\dir" -Force


Remove-Item "C:\path\to\file.txt" -Force
Remove-Item "C:\path\to\directory" -Recurse -Force


Copy-Item "source.txt" "destination.txt" -Force
Copy-Item "dir\" "backup\" -Recurse


Move-Item "old_name.txt" "new_name.txt"


$content = Get-Content "file.txt"
$content = Get-Content "file.txt" -Raw  # As single string


$content | Set-Content "file.txt"


"more content" | Add-Content "file.txt"

String Operations

$name = "John"
Write-Output "Hello, $name!"


Write-Output ("Hello, {0}! Your score is {1:N2}" -f $name, 95.5)


$string = "  Hello World  "


$trimmed = $string.Trim()


$replaced = $string.Replace("World", "PowerShell")


if ($string -like "*World*") {
    Write-Output "Contains 'World'"
}


if ($string -match "^Hello") {
    Write-Output "Starts with 'Hello'"
}


$parts = "a,b,c".Split(",")

Part 4: CI/CD Configuration

GitHub Actions

name: CI/CD Pipeline

on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main ]
  workflow_dispatch: # Allow manual trigger

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [16.x, 18.x, 20.x]

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Setup Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}

      - name: Install dependencies
        run: npm ci

      - name: Run linter
        run: npm run lint

      - name: Run tests
        run: npm test

      - name: Upload coverage
        uses: codecov/codecov-action@v3

  build:
    needs: test
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '18'

      - name: Install dependencies
        run: npm ci

      - name: Build
        run: npm run build

      - name: Upload artifacts
        uses: actions/upload-artifact@v3
        with:
          name: build
          path: dist/

  deploy:
    needs: build
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main'

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Download artifacts
        uses: actions/download-artifact@v3
        with:
          name: build

      - name: Deploy to Azure
        run: az webapp up --name myapp --resource-group myrg

Azure Pipelines

trigger:
- main
- develop

pool:
  vmImage: 'ubuntu-latest'

variables:
  buildConfiguration: 'Release'
  packageFolder: '$(build.artifactStagingDirectory)/package'

stages:
- stage: Build
  displayName: 'Build stage'
  jobs:
  - job: Build
    displayName: 'Build job'
    steps:
    - task: NodeTool@0
      inputs:
        versionSpec: '18.x'
      displayName: 'Install Node.js'

    - script: |
        npm ci
      displayName: 'Install dependencies'

    - script: |
        npm run build
      displayName: 'Build application'

    - task: ArchiveFiles@2
      inputs:
        rootFolderOrFile: 'dist'
        includeRootFolder: false
        archiveType: 'zip'
        archiveFile: $(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip
      displayName: 'Archive build artifacts'

    - publish: $(Build.ArtifactStagingDirectory)/$(Build.BuildId).zip
      artifact: drop

- stage: Deploy
  displayName: 'Deploy stage'
  dependsOn: Build
  condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/main'))
  jobs:
  - deployment: Deploy
    displayName: 'Deploy job'
    environment: 'production'
    strategy:
      runOnce:
        deploy:
          steps:
          - task: AzureWebApp@1
            inputs:
              azureSubscription: 'your_subscription_id'
              appName: 'your_webapp_name'
              package: $(Pipeline.Workspace)/drop/$(Build.BuildId).zip

DevOps Best Practices

Git

• Use conventional commits
• Keep commits small and focused
• Write clear, descriptive messages
• Keep feature branches short-lived
• Rebase feature branches before merging
• Sign commits for security-critical projects

Shell Scripting

• Always use strict mode (set -euo pipefail)
• Quote variables properly
• Handle errors gracefully with traps
• Validate inputs and parameters
• Use functions for reusability
• Add proper error messages to stderr

PowerShell

• Use strict mode for security
• Use proper cmdlet names (no aliases)
• Implement error handling with try-catch
• Test scripts thoroughly
• Use parameter validation
• Handle pipeline errors properly

CI/CD

• Use secure variable management for secrets
• Cache dependencies to speed up builds
• Run tests on multiple environments
• Use matrix builds for different configurations
• Implement proper artifact management
• Add deployment gates and approvals
• Provide clear build status

Anti-Patterns

• Starting work before the plan or gate is clear: Execution drifts when success criteria are implied instead of explicit.
• Treating verification as optional cleanup: The last mile is where regressions and missing updates are usually hiding.
• Mixing planning, implementation, and release work in one jump: You lose the causal chain that explains why a change is safe.

Verification Protocol

Before claiming "skill applied successfully":

1. Pass/fail: The Devops Tooling workflow starts from explicit success criteria, constraints, and stop conditions.
2. Pass/fail: Required evidence is collected before any completion, approval, or readiness claim.
3. Pass/fail: The next action follows the documented gate order without skipping review or verification steps.
4. Pressure-test scenario: Apply the workflow under time pressure with one failing check and one tempting shortcut.
5. Success metric: Zero rationalizations; blocked, failed, or unverified work is reported as such.

References & Resources

Documentation

• CI/CD Patterns — GitHub Actions patterns, caching, security scanning, and deployment strategies
• Shell Scripting Patterns — PowerShell and Bash patterns side-by-side for automation

Scripts

• Setup Git Hooks — PowerShell script to install pre-commit, commit-msg, and pre-push hooks

Examples

• GitHub Actions Templates — 8 production-ready workflow templates for Node.js, Python, Docker, Terraform

Cross-Client Portability

This skill is written to stay usable across GitHub Copilot, Claude Code, and Codex.

• GitHub Copilot: keep the folder in a Copilot-visible skill path or wrap the workflow in project instructions when folder discovery is unavailable.
• Claude Code: keep the folder in a local skills directory or a compatible plugin source.
• Codex: install or sync the folder into $CODEX_HOME/skills/devops-tooling and restart Codex after major changes.

MCP Availability And Fallback

Preferred MCP Server: GitHub MCP

• Fallback prompt: "Use the Devops Tooling skill without MCP. Rely on the local SKILL.md, bundled references or scripts, and manual verification. Show the exact commands, evidence, and final checks you used before concluding."
• Use standard local tools such as git, gh, CI logs, and shell automation scripts for repository and pipeline work.
• Prefer the bundled repo scripts or direct YAML edits when the MCP host does not expose GitHub operations.

Related Skills

• development-workflow: Use it when the workflow also needs planning, quality gates, and delivery tracking.
• code-quality: Use it when the workflow also needs two-stage review (spec compliance first, then code quality), maintainability, and refactoring guidance.
• systematic-debugging: Use it when the workflow also needs root-cause debugging before proposing fixes.
• test-driven-development: Use it when the workflow also needs test-first implementation and regression safety.