Writing Changelogs

Announce at start: "I'm using the bito writing-changelogs skill — Technical Writer for the changelog, Marketing Copywriter for the release announcement."

Quick Reference

Output	Persona	Location	Audience
CHANGELOG.md entry	Technical Writer	CHANGELOG.md (project root)	Existing users upgrading
Release announcement	Marketing Copywriter	GitHub Release, blog, social	Potential and existing users

Change History

Injected at skill load time — use as your starting point for Step 1.

Latest tag: !git describe --tags --abbrev=0 2>/dev/null || echo "(no tags)"

Commits since last tag: !git log --oneline $(git describe --tags --abbrev=0 2>/dev/null || echo HEAD~20)..HEAD 2>/dev/null || git log --oneline -20 2>/dev/null || echo "(no git history)"

Process

Step 1: Gather the changes

Use the change history above as your starting point. Also review:

• Closed PRs and issues
• ADRs written during the period
• Design docs marked as "Implemented"

For each change, note:

• What changed (the fact)
• Why it matters to users (the benefit)
• What users need to do (migration steps, if any)

Step 2: Write the CHANGELOG.md entry

Load the Technical Writer persona from ${CLAUDE_PLUGIN_ROOT}/personas/technical-writer.md.

Dialect: Check for BITO_DIALECT environment variable or the project's bito config for a dialect preference (en-us, en-gb, en-ca, en-au). If set, use that dialect's spelling conventions consistently throughout both the changelog entry and the release announcement. If not set, default to en-US.

Follow Keep a Changelog conventions:

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

### Added
- [Feature description with concrete detail]

### Changed
- [What changed and why it's different from before]

### Fixed
- [What was broken and how it manifests — not just "fixed bug in X"]

### Removed
- [What's gone and what replaces it, if anything]

### Migration
- [Concrete steps users must take to upgrade]

Guidelines: group by user impact (not code), name the visible behavior, include migration steps for any behavior change (even "No migration needed"), link to ADRs for rationale, one line per change.

Step 3: Write the release announcement

Load the Marketing Copywriter persona from ${CLAUDE_PLUGIN_ROOT}/personas/marketing-copywriter.md.

Structure:

1. Headline. What's the one thing that makes this release worth attention? Lead with it. Format: vX.Y.Z: [One-sentence summary of the headline change].
2. 2-3 key changes, framed as benefits. Not "added readability scoring" but "catch jargon-heavy prose before it ships." Each with a concrete example or metric.
3. Install/upgrade command. Copy-pasteable. The reader should be able to try it in under a minute.
4. Link to the full changelog. For users who want the complete list.

Guidelines: benefits before features, one core message per announcement, be specific ("enforces a 2,000-token budget" not "improved quality"), match energy to scope.

Step 4: Cross-reference

• Ensure CHANGELOG.md entries link to relevant ADRs
• Ensure the release announcement links to the full changelog
• If new features have end-user docs, link from the announcement

Step 5: Quality check

For the CHANGELOG.md entry, verify:

• Changes are grouped by user impact (Added/Changed/Fixed/Removed), not by file or module
• Each entry describes user-visible behavior, not implementation detail
• Migration steps are present for any behavior change (even "No migration needed")
• Links to ADRs are included where decisions drove the change

For the release announcement, verify:

• Leads with the headline benefit, not a feature list
• Includes a copy-pasteable install/upgrade command
• Every claim is specific — no "various improvements" or "better performance"
• Scope is honest — doesn't oversell a minor release

Step 6: Tone firewall

Run both outputs through editorial-review if available. Watch for:

• Changelog: Technical Writer voice should be factual and direct, not marketing-adjacent. No "exciting new feature" in a changelog.
• Announcement: Marketing Copywriter voice should be enthusiastic but credible. No superlatives without evidence. No disparaging prior versions ("unlike the old, broken approach...").

Integration

• Upstream: Branch completion workflows identify changes to document. ADRs and design docs provide rationale context.
• Downstream: Release announcements may link to writing-end-user-docs for new features. The changelog becomes a reference for future curating-context handoffs.
• Paired with: writing-end-user-docs — if a feature is significant enough for a changelog entry, it may also need updated user docs.
• Triggered by: Version tagging, PR merge to main with user-visible changes, or explicit invocation at release time.

Common Mistakes

Mistake	Fix
Changelog entries describe code, not behavior	"Added readability.rs" tells users nothing. "Added readability scoring for documentation files" tells them what they gained.
Missing migration steps	Even trivial upgrades benefit from "No migration needed — drop-in replacement." Users scanning for migration steps deserve an explicit answer.
Announcement oversells a patch release	Match the energy to the scope. A bugfix gets two sentences. A major feature gets a paragraph. Don't inflate.
Same voice for both outputs	The changelog and announcement have different audiences and different personas. If they read the same, one of them is wrong.
Vague changelog entries ("various improvements", "bug fixes")	Name every change specifically. If a change isn't worth naming, it isn't worth listing.
Announcement without a try-it command	The reader decided to try it. Don't make them hunt for how. Include the install or upgrade command.