The body is lean and instruction-dense — it never explains what a worktree or agent worker is, and lines like 'Never run parallel writers in the parent checkout' earn their tokens; it avoids the padded conceptual preamble penalized at score 1 and the over-explanation of score 2.

Provides a copy-paste-ready JSON agent contract plus concrete settings ('type: implementer', 'worktree: true', 'write_authority: worktree_write', bounded 'write_roots'), matching the score-3 'fully executable; copy-paste ready' anchor rather than the pseudocode of score 2.

The four-phase sequence (Set The Tournament → Generate Independently → Judge Once → Integrate Only After PASS) has explicit validation checkpoints — 'VERDICT: PASS|FAIL', 'apply/merge the winner only after the judge reports PASS with real checks', 'Re-run the repository's checks in the parent after apply' — meeting the score-3 anchor with feedback loops, well above the implicit-checkpoint score 2.

No bundle files exist and none are needed; the skill is a self-contained process with well-organized sections and no nested or dangling references, so per the scoring notes a no-reference, well-structured skill scores 3 rather than the monolithic-wall or unsplit-inline cases at lower levels.

Lists multiple concrete actions — 'Generate a small set of independent candidate solutions in worktrees', 'judge them against one explicit rubric', 'apply the winner only after PASS verification' — matching the score-3 anchor of several specific concrete actions rather than the single-domain score-2 example.

The 'what' is explicit, but there is no 'Use when...' clause or equivalent trigger guidance for 'when' to use the skill; per the judging guidelines a missing trigger clause caps completeness at 2, and it is not score 1 because the capability is clearly stated.

Domain terms like 'candidate solutions', 'judge', and 'rubric' are relevant, but the phrasing leans technical ('worktrees', 'PASS verification') and omits natural user variations such as 'compare options' or 'best of N', fitting the score-2 'some relevant keywords but missing common variations' rather than the broad natural-term coverage of score 3.

The ensemble/best-of-N niche with worktree isolation, rubric judging, and PASS verification is distinctive and unlikely to trigger for unrelated skills, matching the score-3 'clear niche with distinct triggers' anchor; it is above score 2 because the described behavior is specific rather than broadly overlapping.