Conciseness

The body is lean and assumes Claude's competence — no padding explaining what a changelog is or how git works. Minor redundancy keeps it below a 5: the 'run anytime / non-destructive' point is stated in Goal ('run it as many times as you want'), echoed in Workflow step 4 ('Do NOT commit, tag, or bump versions'), and restated in Notes ('The agent can be asked to run this skill at any point — mid-feature, before a PR, or right before cutting a release').

Actionability

Fully executable, copy-paste-ready commands cover the workflow: `git tag --list "v*" --sort=-v:refname | head -n 1`, `git log --oneline "$LAST_TAG"..HEAD`, a complete `gh api repos/:owner/:repo/releases/generate-notes` invocation with flags and `--jq '.body'`, and `git diff --stat`. The edit operation is precisely bounded ('Replace everything between `## [Unreleased]` and the next `## [` heading') and a concrete markdown template plus the empty-log branch cover the common cases.

Workflow Clarity

A clear 4-step sequence with a real checkpoint for the empty-log case ('If `git log "$LAST_TAG"..HEAD` is empty, leave the `[Unreleased]` section empty and tell the user'). Not a 5: there is no post-edit verification that stamped release sections were preserved, and the requirement that the `[Unreleased]` section 'must always exist' gives no instruction for when CHANGELOG.md lacks one. Not a 3: the operation is explicitly framed as non-destructive and idempotent, so the destructive/batch validation cap does not apply.

Progressive Disclosure

A single, well-sectioned file (Goal, Workflow, Release Story Format, Style Guidelines, When There Are No Changes, Notes) with no nested or dangling references — no references/, scripts/, or assets/ exist and none are needed at this size. Every section is core workflow material, so nothing belongs in a separate file, and navigation is trivial.

Specificity

'draft or update the [Unreleased] section of CHANGELOG.md from the actual changes since the last tag' names concrete actions with a precise target, source, and explicit non-goals ('Does NOT bump versions or create tags') — comprehensive for its domain (a 5), but the imperative 'Use this skill to draft...' and 'Run this at any point' voice is not the third person the guidelines require, costing 1 point. Not a 3: it lists several specific actions with full domain coverage, not just 1-2.

Completeness

Both what and when are explicit: 'Use this skill to draft or update the [Unreleased] section... from the actual changes since the last tag' plus 'Run this at any point during development to keep a working copy of the release narrative', with a negative scope boundary. Not a 5: the when-clause gives timing rather than concrete user trigger phrases ('Use when the user asks to draft release notes or update the changelog'). Not a 3: an explicit use-when equivalent is present, so the completeness cap does not apply.

Trigger Term Quality

Good natural-keyword coverage: 'CHANGELOG.md', '[Unreleased]', 'draft', 'release narrative', 'last tag', 'versions', 'tags'. Not a 5 because the most natural user phrase — 'release notes', the skill's own name — never appears, nor do synonyms like 'changelog entry'. Not a 3: coverage goes well beyond one or two generic keywords.

Distinctiveness Conflict Risk

Clear niche (drafting the unreleased changelog section) with distinct triggers and an explicit exclusion — 'Does NOT bump versions or create tags' — that cleanly separates it from the nearest competing skill (release-bump). Minimal conflict risk; no anchor above fits.