Changelog Management Skill

You have been invoked to manage the project changelog. This is a strategic memory system, not a tool log.

Your Tasks

If Reading (gathering context):

1. Identify the relevant changelog:
   • Project root → ./CHANGELOG.md
   • Monorepo apps → apps/<app-name>/CHANGELOG.md
   • Sub-packages → packages/<pkg-name>/CHANGELOG.md
2. Read the Current State section (top of file) for quick orientation
3. Search recent History entries for:
   • The specific area/files being modified
   • Related decisions or patterns
   • Known gotchas or technical notes
4. Report back with relevant context that should inform the current work

If Writing (documenting changes):

1. Determine what happened this session:
   • Code changes made
   • Decisions reached
   • Direction shifts discussed
   • Insights generated
   • Technical gotchas discovered
2. Update the Current State section if capabilities changed:
   • Update progress indicators
   • Add/check items in "What's Working"
   • Update "What's Next" priorities
3. Add a History entry with:

   ## [DATE] - [BRIEF SESSION SUMMARY]
   
   ### Direction & Vision
   - [Strategic shifts, even without code]
   
   ### Changes
   - **[Description]** — `[files]` ([context])
   
   ### Insights
   - [★ Insight blocks or learnings]
   
   ### Technical Notes
   - [Platform quirks, decisions]
   
   ### Pending
   - [ ] [Incomplete items]

4. Be specific, not vague:
   • ❌ "Fixed auth bug"
   • ✅ "Fixed middleware setting response headers instead of request headers — server components read request headers"

Bootstrap Mode (First-Time Setup)

If no CHANGELOG.md exists, bootstrap from session history:

Step 1: Find the sessions index

The project path determines the sessions folder. Convert the project path to the folder name:

• /path/to/your/project
• becomes: ~/.claude/projects/-path-to-your-project/

Read the sessions-index.json file in that folder.

Step 2: Extract session summaries

The index contains entries like:

{
  "sessionId": "abc123",
  "summary": "Human-readable session summary",
  "firstPrompt": "What user first asked",
  "created": "2026-01-14T20:59:20.530Z",
  "gitBranch": "feat/some-feature",
  "messageCount": 10
}

CRITICAL: Only use the summary field - these are factual, already generated. DO NOT invent, deduce, or hallucinate additional details.

Step 3: Create changelog from summaries

Group sessions by date and create entries:

## Historical Sessions (from Claude Code session logs)

> Note: These entries are auto-generated from session summaries.
> Context may be incomplete. Add details if you remember more.

### 2026-01-14
- **Vibelabs Bento Grid Hero & Site Revert** (branch: `feat/homepage-redesign-2026`, 7 messages)
- **Human-Centric Vibelabs One-Pager** (branch: `main`, 10 messages)

### 2026-01-05
- **Per-app volume mixer macOS app research** (branch: `main`, 7 messages)

Step 4: Add Current State section

After historical entries, add a Current State section based on:

• Git status (git log --oneline -10)
• README content
• Visible project structure

Mark inferred information clearly:

## Current State

> **Last Updated:** [DATE]
> **Status:** *Inferred from codebase - please verify*

### What's Working (inferred from code)
- [x] Item visible in codebase

Bootstrap Rules

1. ONLY use factual sources: session summaries, git log, existing docs
2. NEVER invent context: If you don't know WHY something was done, say "Context unknown"
3. NEVER hallucinate details: Session summary says "Fixed auth bug" → write exactly that, don't elaborate
4. Mark uncertainty: Use "inferred", "from session log", "context unknown" labels
5. Invite corrections: Add note asking user to fill in missing context

Context Triggers

Automatically consider reading the changelog when:

• About to modify ANY code you haven't touched recently in this session
• Wondering "what was the approach here?" or "why is this done this way?"
• User asks about previous work ("what did we do with X?", "where were we?")
• Starting a new session or after context compaction
• Before making changes that might conflict with recent decisions
• Unsure if something was already implemented or fixed

Automatically consider writing when:

• ANY code changes were made (features, fixes, refactoring)
• Decisions were reached about how to do something
• User expressed preferences, changed direction, or clarified vision
• ★ Insight blocks were generated
• Something non-obvious was discovered (gotchas, patterns, behaviors)
• Leaving work incomplete (document what's pending)
• A conversation led to strategic clarity (even without code changes)