Automate changelog generation from commits, PRs

Changelog Automation

Patterns and tools for automating changelog generation, release notes, and version management following industry standards.

When to Use This Skill

• Setting up automated changelog generation
• Implementing Conventional Commits
• Creating release note workflows
• Standardizing commit message formats
• Generating GitHub/GitLab release notes
• Managing semantic versioning

Core Concepts

1. Keep a Changelog Format

# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## Detailed patterns and worked examples

Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient.

## Summary

This release introduces dark mode support and improves checkout performance
by 40%. It also includes important security updates.

## Highlights

### 🌙 Dark Mode

Users can now switch to dark mode from settings. The preference is
automatically saved and synced across devices.

### ⚡ Performance

- Checkout flow is 40% faster
- Reduced bundle size by 15%

## Breaking Changes

None in this release.

## Upgrade Guide

No special steps required. Standard deployment process applies.

## Known Issues

- Dark mode may flicker on initial load (fix scheduled for v2.1.1)

## Dependencies Updated

| Package | From    | To      | Reason                   |
| ------- | ------- | ------- | ------------------------ |
| react   | 18.2.0  | 18.3.0  | Performance improvements |
| lodash  | 4.17.20 | 4.17.21 | Security patch           |

Commit Message Examples

# Feature with scope
feat(auth): add OAuth2 support for Google login

# Bug fix with issue reference
fix(checkout): resolve race condition in payment processing

Closes #123

# Breaking change
feat(api)!: change user endpoint response format

BREAKING CHANGE: The user endpoint now returns `userId` instead of `id`.
Migration guide: Update all API consumers to use the new field name.

# Multiple paragraphs
fix(database): handle connection timeouts gracefully

Previously, connection timeouts would cause the entire request to fail
without retry. This change implements exponential backoff with up to
3 retries before failing.

The timeout threshold has been increased from 5s to 10s based on p99
latency analysis.

Fixes #456
Reviewed-by: @alice

Best Practices

Do's

• Follow Conventional Commits - Enables automation
• Write clear messages - Future you will thank you
• Reference issues - Link commits to tickets
• Use scopes consistently - Define team conventions
• Automate releases - Reduce manual errors

Don'ts

• Don't mix changes - One logical change per commit
• Don't skip validation - Use commitlint
• Don't manual edit - Generated changelogs only
• Don't forget breaking changes - Mark with ! or footer
• Don't ignore CI - Validate commits in pipeline