---

name: workflow-development description: Create, debug, and optimize GitHub Actions workflows with security best practices. USE THIS SKILL when user says "create workflow", "fix workflow", "workflow fails", "add CI", "reusable workflow", or needs help with GitHub Actions. allowed-tools:

• Bash
• Read
• Write
• Edit
• Glob
• Grep

---

Workflow Development Skill

Design, debug, and optimize GitHub Actions workflows with security best practices.

Trigger Phrases

• "create a CI workflow"
• "add a release workflow"
• "my workflow is failing"
• "make this workflow reusable"
• "workflow security audit"
• "add [language] CI"

Security Requirements (Non-Negotiable)

SHA Pinning

Copy# CORRECT
- uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1

# WRONG - Never use tags
- uses: actions/checkout@v4

Minimal Permissions

Copypermissions:
  contents: read  # Start with minimum

# Only add what's needed:
# pull-requests: write  # For PR comments
# packages: write       # For container registry

Reusable Workflow Pattern

Caller (in project)

Copyname: CI
on: [push, pull_request]

jobs:
  ci:
    uses: epicpast/.github/.github/workflows/reusable-ci-python.yml@main
    with:
      python-version: '3.12'
      coverage-threshold: 80
    secrets: inherit

Reusable Definition (in .github repo)

Copyname: Reusable Python CI

on:
  workflow_call:
    inputs:
      python-version:
        required: false
        type: string
        default: '3.12'
      coverage-threshold:
        required: false
        type: number
        default: 80

permissions:
  contents: read

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
      - uses: epicpast/.github/actions/setup-python-uv@main
        with:
          python-version: ${{ inputs.python-version }}
      - run: uv run ruff check .

Available Reusable Workflows

Composite Action Pattern

Copy# action.yml
name: 'Setup Python with uv'
description: 'Install Python and uv with caching'

inputs:
  python-version:
    required: false
    default: '3.12'

runs:
  using: 'composite'
  steps:
    - uses: astral-sh/setup-uv@v4
      with:
        enable-cache: true
    - shell: bash
      run: uv python install ${{ inputs.python-version }}

Debugging Workflows

Common Failures

Debug Step

Copy- name: Debug
  run: |
    echo "Event: ${{ github.event_name }}"
    echo "Ref: ${{ github.ref }}"
    echo "Actor: ${{ github.actor }}"

Performance Optimization

Caching

Copy- uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f
  with:
    path: ~/.cache/uv
    key: ${{ runner.os }}-uv-${{ hashFiles('uv.lock') }}

Matrix Builds

Copystrategy:
  fail-fast: false
  matrix:
    os: [ubuntu-latest, macos-latest]
    python: ['3.11', '3.12']

Concurrency

Copyconcurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true