Conciseness

The body is mostly dense, repo-specific rule-making (charset boundary, per-section ceilings, mermaid gotchas) that Claude cannot infer, but there is real duplication: 'Long verbatim quote blocks, full file listings, and full validation transcripts SHOULD live inside <details>' appears verbatim twice; the per-section ceilings table and the 'Required body structure' table restate overlapping limits; and the 'A previous version of this skill incorrectly required ASCII' paragraph is history that earns no tokens. This matches the score-3 anchor (mostly efficient but could be tightened) rather than 4, where only minor trimming would be needed.

Actionability

Guidance is fully executable: exact input-gathering commands ('git diff --name-status <base>...HEAD', 'git log --no-merges <base>..HEAD --oneline'), a copy-paste mmdc validation loop with a real awk extraction one-liner, an exact trailer line, and a concrete drift example ('A -->|"[EXEC] work"| B'). The common case (draft a PR body, validate diagrams, self-check) is covered with commands Claude can run as written.

Workflow Clarity

The execution checklist is a clear ordered 9-step sequence with explicit validation checkpoints and feedback loops: a lint STOP gate before drafting ('If lint is red, STOP, fix, re-run'), mandatory mermaid validation with a fix-and-rerun loop ('If mmdc reports any error, fix the diagram and re-run'), a rubric-based self-check pass, and a line-count tightening loop. This matches the score-5 anchor including error-recovery loops and a checklist.

Progressive Disclosure

All four referenced assets (assets/pr-body-template.md, assets/mermaid-conventions.md, assets/section-rubric.md, assets/scenario-evidence-rubric.md) exist and are one level deep, each with an explicit load point tied to a step ('Load assets/mermaid-conventions.md before drafting any block'). However, the 325-line body itself carries content that belongs in those assets -- the 28-line charset rationale and the anti-patterns/gotchas overlap -- so this is good structure with minor organization gaps rather than the clean split of the score-5 anchor.

Specificity

The description enumerates the concrete deliverable in full: 'TL;DR, Problem (WHY), Approach (WHAT), Implementation (HOW), 1-3 validated mermaid diagrams, explicit trade-offs, validation evidence, and a How-to-test section -- with every WHY-claim backed by a verbatim quote'. It names multiple specific concrete actions and comprehensively covers what the skill produces, matching the score-5 anchor; nothing remains vague.

Completeness

It explicitly answers both questions: what ('Use this skill to write the PR description (PR body) ... Produces one self-sufficient GitHub-Flavored Markdown artifact' with the section list) and when ('Activate when the user asks to "write a PR description", ... or any equivalent'). This is a clear match for the score-5 anchor with concrete trigger phrases.

Trigger Term Quality

Natural trigger phrases are present and phrased as users would say them: 'write a PR description', 'draft a PR body', 'open a PR', 'fill in the PR template'. This is good keyword coverage per the score-4 anchor, but common variations the body itself lists ('summarize this branch as a PR', 'create the PR write-up', 'PR summary') are missing from the description, so it falls short of the comprehensive-synonyms anchor at 5.

Distinctiveness Conflict Risk

The niche is distinct (PR bodies for microsoft/apm with an anchored-quotes requirement), but the trigger 'open a PR' also naturally matches skills that actually create/open pull requests, whereas this skill only writes the body. That is minor overlap risk with a closely related skill, matching the score-4 anchor rather than the minimal-conflict anchor at 5.