Changelog Curator

Changelog Curator

What this skill does

This skill directs the agent to write or update a CHANGELOG.md that follows the Keep a Changelog format. It takes a list of commits, PR titles, or a git log dump, groups changes into the correct categories (Added, Changed, Fixed, Removed, Deprecated, Security), writes them in clear human-readable language, and formats the file correctly with semantic versioning and dates.

Use this before cutting a release, during sprint wrap-up, or when your changelog has fallen behind and you need to bring it up to date.

How to use

Claude Code / Cline

Copy this file to .agents/skills/changelog-curator/SKILL.md in your project root.

Then ask:

• "Use the Changelog Curator skill to update CHANGELOG.md for the v2.3.0 release. Here's the git log: [paste log]."
• "Use the Changelog Curator skill to create a CHANGELOG.md for these PRs: [list PRs]."

Provide:

• The git log (git log --oneline vX.Y.Z..HEAD) or a list of PR titles/descriptions
• The new version number and release date (or "Unreleased")
• The existing CHANGELOG.md if one exists (so the agent can append, not overwrite)

Cursor

Add the instructions below to your .cursorrules or paste them into the Cursor AI pane. Paste the git log or PR list along with the version number.

Codex

Paste the git log or PR list, the current CHANGELOG.md if it exists, and the version number. Ask Codex to follow the instructions below.

The Prompt / Instructions for the Agent

When asked to write or update a changelog, follow these steps:

Step 1 — Parse the input

The input may be:

• A raw git log --oneline dump
• A list of PR titles
• A mix of both

For each item, extract:

• The core change (ignore ticket numbers, PR numbers, merge commit boilerplate like "Merge branch X")
• The type of change (what category does it belong to?)
• The user-facing impact (what does a user or developer actually experience?)

Step 2 — Categorize each change

Use exactly these Keep a Changelog categories:

• Added — New features, new endpoints, new configuration options, new pages
• Changed — Changes to existing functionality, updated behavior, updated dependencies (when behavior changes)
• Deprecated — Features that still work but will be removed in a future version
• Removed — Features, endpoints, or fields that are gone
• Fixed — Bug fixes
• Security — Fixes for security vulnerabilities (always list separately and first if present)

If a commit is unclear (e.g., "misc cleanup"), use your best judgment or place it under "Changed."

Step 3 — Write each entry

Rules for writing changelog entries:

• Write in the past tense ("Added", "Fixed", "Removed" — not "Add", "Fix", "Remove")
• Write from the user's perspective — what changed for them, not what the developer did internally
• Be specific — "Fixed crash when uploading files larger than 10 MB" not "Fixed file upload bug"
• Do not include commit hashes, PR numbers, or developer names (unless the project convention includes them)
• Remove redundant prefixes like "feat:", "fix:", "chore:" from conventional commits
• If multiple commits address the same issue, combine them into one entry

Step 4 — Format the CHANGELOG.md section

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

### Security
- [Security fixes first, if any]

### Added
- [New feature 1]
- [New feature 2]

### Changed
- [Change 1]

### Deprecated
- [Deprecation 1]

### Removed
- [Removal 1]

### Fixed
- [Bug fix 1]
- [Bug fix 2]

Only include sections that have entries. Don't include empty sections.

Step 5 — Handle the full file

If an existing CHANGELOG.md is provided:

• Insert the new version section above the previous most-recent version
• Keep the [Unreleased] section at the top if it exists; convert it to the new version
• Do not modify any existing version sections
• Ensure the [Unreleased] section remains (empty or reset) at the top after inserting

If no CHANGELOG.md exists, create one with this header:

# 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/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

[new version section here]

Example

Input to Agent:

"Use the Changelog Curator skill for v1.4.0 released today. Git log:

a1b2c3d feat: add CSV export to reports page
d4e5f6g fix: crash when user has no profile picture
h7i8j9k fix: login redirect loop on mobile Safari
l0m1n2o chore: upgrade lodash to 4.17.21
p3q4r5s feat: add dark mode toggle
t6u7v8w security: patch XSS in comment renderer
x9y0z1a feat: new /api/v2/users endpoint with pagination
b2c3d4e fix: orders not showing for guest users
```"

Output from Agent:

[1.4.0] - 2026-03-15

Security

• Patched XSS vulnerability in the comment renderer

Added

• Added CSV export to the reports page
• Added dark mode toggle
• Added new /api/v2/users endpoint with pagination support

Changed

• Updated lodash dependency to 4.17.21

Fixed

• Fixed crash when a user has no profile picture set
• Fixed login redirect loop on mobile Safari
• Fixed orders not displaying for guest users

Notes

• Changelog entries are written for readers (users, developers consuming the API), not for the author. If a change only affects CI configuration or internal test setup, it's usually fine to omit it.
• For breaking changes, add a ⚠ Breaking prefix to the entry and consider adding a migration note.
• Run git log vX.Y.Z..HEAD --oneline to get the commit list for a specific range.