Managing Changelog

Create and maintain CHANGELOG.md files following standard formats (Common Changelog + Keep a Changelog).

When to Use

Activate when:

• Creating new CHANGELOG.md
• Adding release entry
• Updating Unreleased section
• Validating changelog format
• User: "changelog", "release notes", "version history", "add to changelog", "update changelog"

Core Workflows

ID	Purpose	Trigger
WF1	Create CHANGELOG.md	Initial setup
WF2	Add Release Entry	New version
WF3	Update Unreleased	Pre-release changes
WF4	Validate Format	Quality check
WF5	Promote Prerelease	Stabilize alpha/beta/rc

WF1: Create CHANGELOG.md

Purpose: Initialize new changelog file

When: No CHANGELOG.md exists, explicit request

Steps:

1. Choose format

   • Ask user: Common Changelog (strict, references, authors) or Keep a Changelog (simpler)
   • Default: Common Changelog

2. Write initial structure

   # Changelog
   
   All notable changes documented here.
   Format: [Common Changelog](https://common-changelog.org) / [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
   Versioning: [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
   
   ## [Unreleased]
   
   [unreleased]: https://github.com/owner/repo/compare/vX.X.X...HEAD
   

3. Confirm creation

WF2: Add Release Entry

Purpose: Add new version entry

When: New release, version bump, explicit request

Execution:

1. Gather info

   • Version: semver-valid (e.g., 1.2.3)
   • Date: YYYY-MM-DD (ISO 8601)
   • Changes: from git log, HISTORY.md, or user input

2. Process changes (improve quality)

   • Remove noise: Exclude dotfiles (.gitignore), dev deps, style tweaks, doc formatting | Include: refactorings, runtime changes, code style using new features, new docs
   • Rephrase: Align terminology, add missing details, remove irrelevant specifics
   • Merge related: Combine multi-commit changes (e.g., bump same dep twice → single entry)
   • Skip no-ops: Exclude negated changes (reverts)
   • Keep brief: One line per change, details in references

3. Categorize changes

   Common Changelog: Changed, Added, Removed, Fixed
   Keep a Changelog: Changed, Added, Deprecated, Removed, Fixed, Security
   

4. Format entry (Common Changelog example)

   ## [1.2.3] - 2025-11-26
   
   ### Changed
   
   - **Breaking:** refactor API to use async/await ([#45](url)) (Author)
   - Improve performance of data processing ([abc123](url))
   
   ### Added
   
   - Add support for JSON export ([#42](url), [#43](url))
   
   ### Fixed
   
   - Fix memory leak in cache ([#44](url)) (Author)
   
   [1.2.3]: https://github.com/owner/repo/releases/tag/v1.2.3
   

5. Add notice (if needed)

   • First release: _First release._
   • Yanked: _This release was yanked due to [issue]._
   • Upgrade guide: _If upgrading: see UPGRADING.md._
   • Place after heading, before change groups

6. Insert entry

   • Place after ## [Unreleased] section
   • Update unreleased link if exists

7. Move unreleased content (if exists)

   • Migrate changes from Unreleased → new release
   • Clear Unreleased section

WF3: Update Unreleased

Purpose: Add changes to Unreleased section

When: Pre-release changes, ongoing work

Steps:

1. Read current CHANGELOG.md

2. Add to Unreleased (if section exists, else create)

   ## [Unreleased]
   
   ### Added
   
   - New feature description ([#XX](url))
   

3. Use Edit tool to append changes

WF4: Validate Format

Purpose: Check changelog follows standards

When: Before release, quality check, explicit request

Checks:

Structure:
- [ ] File named CHANGELOG.md
- [ ] First-level heading: # Changelog
- [ ] Versions sorted latest-first
- [ ] Version format: ## [X.Y.Z] - YYYY-MM-DD
- [ ] Date format: YYYY-MM-DD (ISO 8601)

Categories (Common Changelog):
- [ ] Only: Changed, Added, Removed, Fixed

Categories (Keep a Changelog):
- [ ] Only: Changed, Added, Deprecated, Removed, Fixed, Security

Content:
- [ ] Changes use imperative mood (Add, Fix, Update not Added, Fixed, Updated)
- [ ] Breaking changes prefixed: **Breaking:**
- [ ] References included (commits, PRs, issues)
- [ ] Links at bottom: [X.Y.Z]: url

Common Issues:
- ⚠ Commit log dumps (verbatim copying)
- ⚠ Missing dates
- ⚠ Inconsistent categories
- ⚠ Vague descriptions

Report issues + suggestions

WF5: Promote Prerelease

Purpose: Convert prerelease to stable release

When: Promoting alpha/beta/rc to stable

Approaches:

A. Copy content (default)

• Copy changes from prerelease(s) → release
• Merge related, rephrase, clean as per WF2
• Write as if prereleases don't exist

B. Skip entry (internal testing only)

• No changelog for internal CI/CD test releases
• Only for non-public prereleases

C. Refer to prerelease (private projects, lengthy QA)

• Add notice: _Stable release based on [X.Y.Z-rc.N]._
• Use when all stakeholders familiar with prerelease content
• Example:

  ## [3.1.0] - 2021-07-05
  
  _Stable release based on [3.1.0-rc.2]._
  
  ## [3.1.0-rc.2] - 2021-07-04
  
  ### Fixed
  - Fix localization (a11eb73)
  

Decision: Use A unless B or C explicitly needed

Format Reference

Common Changelog Format

Heading:

## [X.Y.Z] - YYYY-MM-DD

Categories (order):

1. Changed - changes in existing functionality
2. Added - new functionality
3. Removed - removed functionality
4. Fixed - bug fixes

Notice format (optional, after heading):

## [X.Y.Z] - YYYY-MM-DD

_Single-sentence notice with emphasis._

### Category...

• Use for: first release, yanked, essential upgrade guides
• Only one per release
• Examples: _First release._, _Yanked due to security issue._, _See UPGRADING.md._

Change format:

- [**Breaking:**|**Subsystem:**] <Imperative verb> <description> ([refs](url)) (Authors)

References (after change, same line):

• Commits: ([abc123](url)) or submodule: ([owner/name@abc123](url))
• PRs/Issues: ([#123](url)) or external: ([owner/name#123](url))
• External tickets: ([JIRA-837](url))
• Multiple same type: ([#1](url), [#2](url)) not ([#1](url)) ([#2](url))
• Rule: Max 2 refs, pick best starting point (prefer PR over issue if both exist)

Authors (after references):

• Format: (Name1, Name2) or (#refs; Name1, Name2) with semicolon separator
• Example: - Fix loop ([#194](url)) (Alice) or - Fix loop ([#194](url), [#195](url); Alice, Bob)
• Omit if single contributor project
• Bot changes: credit human who merged PR
• Security: Only usernames or real names allowed - NO email addresses, API keys, tokens, file paths, or personal information

Prefixes (bold):

• Breaking: - **Breaking:** change description
• Subsystem: - **UI:** change description or - **Installer (breaking):** change
• Sort: breaking first per category, then by importance, then latest-first

Links (bottom):

[X.Y.Z]: https://github.com/owner/repo/releases/tag/vX.Y.Z
[unreleased]: https://github.com/owner/repo/compare/vX.Y.Z...HEAD

Keep a Changelog Format

Heading: Same as Common Changelog

Categories (order):

1. Added
2. Changed
3. Deprecated
4. Removed
5. Fixed
6. Security

Change format (simpler):

- <Description starting with capital>

Unreleased section:

## [Unreleased]

### Added

- Feature coming soon

Guiding Principles

From Common Changelog:

• Changelogs for humans
• Communicate impact of changes
• Sort by importance
• Skip unimportant content
• Link changes to further info

From Keep a Changelog:

• Humans, not machines
• Entry for every version
• Group same types
• Versions linkable
• Latest first
• Show release dates
• Follow Semantic Versioning

Anti-patterns

Avoid:

• Verbatim git log dumps
• Vague descriptions ("fix stuff")
• Missing dates or wrong format
• Inconsistent categories
• No references/context
• Past tense (use imperative: Add not Added in change text)
• Security violations: API keys, tokens, passwords, email addresses, file paths with personal info, or sensitive data in changelog content

Tool Usage

Read: Load existing CHANGELOG.md or HISTORY.md Write: Create new CHANGELOG.md Edit: Update existing changelog (add entries, update sections)

Integration

GitHub Actions (auto-create GitHub releases from CHANGELOG.md):

name: Release
on: { push: { tags: ['*'] } }
permissions: { contents: write }
jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: docker://antonyurchenko/git-release:latest
        env: { GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}' }

Workflow integration:

• Release: Update before tagging (WF2)
• PR merge: Add to Unreleased (WF3)
• Version bump: Move Unreleased → release (WF2)
• Prerelease: Use WF6 approaches

Examples

Common Changelog:

# Changelog

## [2.1.0] - 2025-11-26

### Changed

- **Breaking:** refactor config to use YAML ([#45](url)) (Alice)

### Added

- Add dark mode support ([#42](url), [#43](url))

### Fixed

- Fix memory leak in parser ([abc123](url))

[2.1.0]: https://github.com/owner/repo/releases/tag/v2.1.0

Keep a Changelog:

# Changelog

## [2.1.0] - 2025-11-26

### Added

- Dark mode support for UI

### Changed

- Config now uses YAML instead of JSON (breaking change)

### Fixed

- Memory leak in parser

[2.1.0]: https://github.com/owner/repo/releases/tag/v2.1.0

Migration Examples

HISTORY.md → CHANGELOG.md:

Input (HISTORY.md):

## VERSION: 2.0.0
date: 2025-11-26
type: update
change_summary: Major refactoring

CHANGES:
- Refactored API to async/await
- Added JSON export
- Fixed memory leaks

Output (CHANGELOG.md):

## [2.0.0] - 2025-11-26

### Changed

- **Breaking:** refactor API to use async/await

### Added

- Add JSON export support

### Fixed

- Fix memory leaks in cache

[2.0.0]: https://github.com/owner/repo/releases/tag/v2.0.0

Quick Reference

Task	Workflow	Output
Create	WF1	Initial CHANGELOG.md
Add release	WF2	## [X.Y.Z] - DATE
Update ongoing	WF3	Append to Unreleased
Validate	WF4	Format compliance check
Promote prerelease	WF5	Alpha/beta/rc → stable