Conciseness

Every line is an instruction ('Review the complete branch diff against the target branch', 'Check tests for the changed behavior. Add missing coverage within the task.'); there is no concept explanation, filler, or padding in the ~26-line body, so every token earns its place.

Actionability

Guidance is concrete and specific throughout — named files ('root `AGENTS.md`'), explicit conditional routing ('For public API or protocol changes, use [chatto-api-compatibility]...'), and a defined PR-description content list. It stops short of fully executable anchor 5 because no commands are given (e.g., how to produce the branch diff) and no example PR description is provided, leaving minor gaps consistent with anchor 4.

Workflow Clarity

This is a simple single-purpose checklist under 50 lines with unambiguous ordering of checks, explicit scope handling ('For a review-only request, report findings without edits'), and an explicit closing validation loop ('After creating or updating a PR, read its stored description and check that it matches the complete diff') — satisfying the simple-skill exception with checkpoints present.

Progressive Disclosure

No bundle files exist or are needed for this skill; the body is well-sectioned and its only external pointers — root `AGENTS.md` and the two sibling skills — are one level deep and clearly signaled via markdown links, matching the guidance that a short skill with well-organized sections and clearly signaled references scores 5.

Specificity

The description names the domain ('a Chatto pull request') and a single concrete action ('Check ... before review or merge') — one action in two timing contexts, not the several distinct actions of anchor 4, but well above the generic-minimal anchor 2.

Completeness

The 'what' is explicit ('Check a Chatto pull request before review or merge') and the 'when' is explicit with concrete trigger phrases ('Use when opening a PR or when asked to check one'), structurally identical to the anchor-5 good example; neither element is vague or merely implied.

Trigger Term Quality

Natural user phrases like 'opening a PR', 'asked to check one', 'review', and 'merge' appear, with both 'pull request' and the 'PR' abbreviation present. Common variations such as 'before merging' or 'PR review' are absent, so it fits good-but-not-comprehensive keyword coverage rather than the full synonym spread of anchor 5.

Distinctiveness Conflict Risk

'Chatto' carves out a clear niche, but the when-clause 'Use when opening a PR' is unqualified by the project name, leaving minor overlap risk with other PR-workflow skills in a general context — mostly distinct rather than the minimal-conflict anchor 5.