# Jj Changelog

> Proactively use to generate or update a CHANGELOG.md file from Jujutsu commit history. Use when you need to create release notes, document changes between tags, or update the project changelog. Emphasizes breaking changes, new features, and user-facing bug fixes.

- Skill: `majiayu000/jj-changelog` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add majiayu000/jj-changelog`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/jj-changelog/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/jj-changelog

---


# Jujutsu Changelog Generator

Generate or update a CHANGELOG.md file from Jujutsu history, emphasizing user-facing changes.

## Standard Operating Procedure

1. **Gather commit history** using the `changes.sh` script in this directory:
   ```bash
   ./changes.sh
   ```

2. **Categorize each commit** based on its description using conventional commit prefixes or semantic analysis:

   | Category | Prefixes/Keywords | Emphasis |
   |----------|-------------------|----------|
   | Breaking Changes | `BREAKING:`, `!:`, `breaking change` | **HIGH** - Always at top |
   | New Features | `feat:`, `feature:`, `add:` | **HIGH** - User-facing |
   | Bug Fixes (User) | `fix:` affecting user-facing behavior | **MEDIUM** |
   | Performance | `perf:` | **MEDIUM** - If user-visible |
   | Bug Fixes (Internal) | `fix:` for internal/dev issues | LOW |
   | Refactoring | `refactor:` | LOW |
   | Documentation | `docs:` | LOW |
   | Tests | `test:` | LOW |
   | Chores | `chore:`, `ci:`, `build:` | LOW |

3. **Format the CHANGELOG.md** with this structure:

   ```markdown
   # Changelog

   All notable changes to this project are documented in this file.

   ## [version/tag] - YYYY-MM-DD

   ### Breaking Changes

   - **BREAKING**: Detailed/full description of breaking change
     - Detailed/full migration steps if applicable

   ### New Features

   - **Feature**: Description of new feature

   ### Bug Fixes

   - **Fix**: Description of user-facing bug fix

   ### Other Changes

   <details>
   <summary>Internal improvements and maintenance</summary>

   - Refactored X for better maintainability
   - Fixed internal issue with Y
   - Updated dependencies

   </details>
   ```

4. **Formatting rules**:
   - Breaking changes MUST be at the top of each version section
   - Breaking changes MUST include migration guidance when possible
   - User-facing features and fixes get full descriptions
   - Internal changes go in a collapsible `<details>` section
   - Empty sections should be omitted
   - Use imperative mood ("Add feature" not "Added feature")
   - Link to issues/PRs if referenced in commit messages

5. **Write the changelog**:
   - If CHANGELOG.md exists, update it (prepend new versions)
   - If it doesn't exist, create it
   - Preserve any manual edits in existing entries

## Example Output

```markdown
# Changelog

## [v2.1.0] - 2024-12-01

### Breaking Changes

- **BREAKING**: Removed deprecated `legacy_api()` function
  - Migrate to `new_api()` which provides the same functionality

### New Features

- **Feature**: Add support for custom output formats
- **Feature**: New `--verbose` flag for detailed logging

### Bug Fixes

- **Fix**: Resolve crash when input file is empty
- **Fix**: Correct timezone handling in date parsing

### Other Changes

<details>
<summary>Internal improvements and maintenance</summary>

- Refactored configuration loading for clarity
- Fixed flaky test in CI pipeline
- Updated pytest to 8.0

</details>

## [v2.0.0] - 2024-11-15

...
```

## Notes

- If commits don't follow conventional commits, use best judgment to categorize
- When uncertain if a change is user-facing, err on the side of including it in the main sections
- Commits with empty descriptions should be skipped
- Multiple commits can be consolidated if they address the same feature/fix