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release-change-analyzer

Compares HEAD with the latest published version to analyze real changes, group by type, and recommend version bumps. Use before publishing a release to understand what actually changed.

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Release Change Analyzer

Analyzes unpublished changes by comparing HEAD with the latest published version. Reads actual diffs instead of just copying commit messages.

When to Use This Skill

  • Before publishing a new release
  • Deciding between major/minor/patch version bump
  • Writing accurate release notes based on real code changes
  • Reviewing what changed since last deployment

What This Skill Does

Step 1: Identify Published Version

# npm
npm view <package-name> version 2>/dev/null || echo "not published"

# PyPI
pip index versions <package-name> 2>/dev/null | head -1

# Or use git tags
git tag --sort=-v:refname | head -1

Step 2: Analyze Real Changes

# Get actual diff (NOT just commit messages)
git diff v{published-version}..HEAD --stat
git diff v{published-version}..HEAD

For each commit, MUST:

  1. Read the actual diff to understand WHAT CHANGED
  2. Describe the REAL change in plain language
  3. Explain WHY it matters (if not obvious)

Step 3: Group and Report

## Unpublished Changes (v{published} -> HEAD)

### Features
| Scope | What Changed |
|-------|--------------|
| auth | Added OAuth2 support with Google and GitHub providers |

### Fixes
| Scope | What Changed |
|-------|--------------|
| api | Fixed race condition in concurrent request handling |

### Refactoring
| Scope | What Changed |
|-------|--------------|
| core | Extracted retry logic from 3 services into shared module |

### Breaking Changes
- Removed deprecated `v1/login` endpoint

### Files Changed
42 files changed, 1205 insertions(+), 387 deletions(-)

### Suggested Version Bump
- **Recommendation**: minor
- **Reason**: New features added, no breaking changes in public API

Version Bump Decision

ConditionBump
Breaking changes in public APImajor
New features, no breaking changesminor
Bug fixes, refactoring, docs onlypatch

Anti-Patterns

  • Copying commit messages verbatim — read the actual diff
  • Describing "what" without "why" — explain impact
  • Missing breaking changes — always check public API surface
  • Guessing at scope — verify from the diff

Example

User: "What changed since last release?"

Output: Reads diff between v1.2.3 and HEAD, identifies 3 features, 2 fixes, 1 refactor, no breaking changes. Recommends minor bump to v1.3.0.

Inspired by: oh-my-opencode get-unpublished-changes command

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