Conciseness

The body is lean and free of concept explanations Claude already knows; the "Untrusted input" block is dense operational safety policy rather than padding. It sits at anchor 4 rather than 5 because minor tokens could be trimmed (the background URL line, slight redundancy in the policy bullets) and the opening line spends tokens on an unresolvable pointer to "the reference implementation".

Actionability

"Produce the same structured per-item + summary format as the reference implementation" delegates the output format to a reference that is not present anywhere in the bundle, and no concrete commands (e.g., a tag-range git log to enumerate merges/commits) or example entries are given — only high-level hints like "Focus on user-facing changes" and "Explicitly list breaking and security signals". This matches anchor 2 (high-level hints, missing specific steps) rather than 3, which requires at least some concrete or executable guidance.

Workflow Clarity

No steps are listed; the implied sequence (locate the last release, enumerate merges/commits, produce per-item + summary output) has many gaps — including how "since last release" is determined — and no validation checkpoints for what is a batch operation over many items, matching anchor 2. It is above anchor 1 because the deliverable and focus are stated coherently, but below anchor 3 because steps are not even enumerated.

Progressive Disclosure

The body's only reference — "the reference implementation" that defines the required output format — has no path and does not exist in the bundle (no references/, scripts/, or assets/ are provided), so navigation to the essential content fails entirely; structure is otherwise minimal (two directive lines plus the "## Untrusted input" section). This fits anchor 2 (references buried/undiscoverable) rather than anchor 3, which presumes at least reachable, if unclearly signaled, external content.

Specificity

"Scan recent merges and commits since last release for changelog content" names a specific domain (merges/commits since last release) and one concrete action (scan for changelog content), matching the anchor for 1-2 concrete actions without comprehensive coverage. It is below anchor 4 because only a single action verb is present, and above anchor 2 because the domain and output purpose are concrete rather than generic.

Completeness

The description has a clear "what" ("Scan recent merges and commits since last release for changelog content") but no "Use when..." clause or equivalent trigger guidance, which the guidelines cap at 3. It cannot score 4 because the "when" is not merely imprecise — it is entirely absent.

Trigger Term Quality

Terms like "merges", "commits", "changelog", and "release" are natural phrases users would say, but common variations such as "release notes", "PRs", "tags", or "what changed since the last release" are missing. This fits anchor 3 (relevant keywords but missing common variations) rather than anchor 4, whose fuller coverage would require those synonyms.

Distinctiveness Conflict Risk

The changelog-from-git-history niche scoped "since last release" is distinct, but the words "commits" and "merges" could also appear in triggers for commit-message-writing or code-review skills, creating minor overlap risk (anchor 4). It falls short of anchor 5's minimal conflict risk because of that shared vocabulary, and is well above anchor 3's generic overlap.