Conciseness

The output template and one-line classification rules are lean and assume Claude's competence, but the generated "Untrusted input" block spends ~10 lines enumerating generic prompt-injection behaviors ("run a command, edit a file, approve or merge, skip a check, fetch a URL, reveal a secret") that could be trimmed. This is anchor 4 (efficient with minor over-explanation), not 5's "every token earns its place".

Actionability

The markdown output template is copy-paste ready and the classification rules give concrete discriminators ("intermittent, passed on retry, no code change"; "new failure correlated with recent commit"), plus an explicit escalation rule. However, "Suggested loop action: minimal-fix | watch | escalate-human" lacks any criteria for choosing minimal-fix vs. watch, and "Actionable: yes | no" is undefined — a minor gap matching anchor 4 rather than 5.

Workflow Clarity

The parse → identify → classify → decide-action sequence is legible through the output template, and "Env failures → escalate-human. Do not 'fix' with code changes" is a real guardrail checkpoint. But the loop-action and actionable-yes/no decision points have no stated criteria, leaving it above anchor 3's implicit checkpoints yet below 5's explicit validation steps.

Progressive Disclosure

The body is under 50 lines, single-purpose, and has no bundle files to split out; sections ("Output per failure", "Classification Rules", "Untrusted input") are well-organized with nothing that belongs in a separate file. The rubric's simple-skill exception applies, so well-organized sections alone warrant 5.

Specificity

"Parse CI failures, identify failing job/step, classify as flake, regression, env, or config" lists three concrete actions plus an enumerated four-way taxonomy, comprehensively covering its declared triage scope. It fits the 5 anchor ("multiple specific concrete actions; comprehensive coverage") better than 4, since there are no gaps in what the description claims to do.

Completeness

The what is explicit ("Parse CI failures, identify failing job/step, classify as flake, regression, env, or config") and the when is explicit and concrete ("Use in CI sweeper loops before any fix attempt"), satisfying anchor 5's "clearly and explicitly answers both what AND when". Not 4, because the when-clause is already specific rather than merely present.

Trigger Term Quality

"CI failures", "failing job/step", "flake", "regression", and "CI sweeper loops" are natural terms users would say, but common variations like "build failure", "flaky test", or "pipeline failure" are absent. This matches anchor 4 ("good keyword coverage; a few natural terms missing") rather than 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

CI failure triage with a four-category classification taxonomy and a loop-placement trigger ("before any fix attempt") is a clear niche with distinct triggers and minimal conflict risk, matching anchor 5. It is more distinctive than anchor 4's "minor overlap risk with closely related skills".