Conciseness

The body is dense and operational — schema, field table, decision function, artifact template, worked script, anti-patterns — with almost no explanation of concepts Claude already knows. Minor trimming is possible: the 'Two regression triggers' list re-explains what the gate_decision code already expresses, and 'Modern teams measure perf at multiple layers' plus 'Both matter: a metric within budget but trending up still warrants a warning' are small narrative touches, which fits the 4 anchor ('efficient; minor instances of over-explanation') rather than the every-token-earns-its-place level of 5.

Actionability

The worked example is executable end-to-end (parses k6 summary.json and lhr-*.json, applies budgets, prints the verdict, exits with its code) and the JSON record, field-source table, and markdown artifact template are all concrete and copy-paste ready. It stops short of the 5 anchor because the central delta-vs-baseline computation is never shown executable — the script reads no baseline and never populates the delta_pct field the decision function depends on — leaving a real gap in covering the common case.

Workflow Clarity

'How to use' gives a clear 5-step sequence (collect artifacts → flatten → fetch baseline and compute delta → apply decision rule → emit artifact, exit non-zero on no-go) and the worked example demonstrates it. It misses 5 because validation checkpoints are implicit rather than explicit — most notably, if expected input artifacts are absent the worked script silently produces zero records and a 'go' verdict (a false pass), and no step says to verify the baseline/artifacts exist. This is a read-and-report gate rather than a destructive change, so the destructive/batch cap to 3 does not apply; the sequence itself is clearly better than the 3 anchor's checkpoint-less listing.

Progressive Disclosure

The split is appropriate: SKILL.md stays the overview and decision logic while per-runner artifact mapping, budgets, and CI wiring are one level deep in a clearly signaled, real reference file ([references/ci-wiring-and-metric-sources.md], linked at the exact points it is needed). The 5 anchor is missed by one concrete organization gap: both the body's code-block label ('# scripts/run_perf_gate.py') and the reference's CI wiring ('python scripts/run_perf_gate.py') point to a scripts/ path that does not exist in the bundle — the script is only inline — a minor but real navigation gap.

Specificity

The description lists several concrete actions — 'Combines k6, JMeter, Gatling or Locust results with Lighthouse CI Web Vitals, applies severity-aware thresholds against the main-branch baseline and returns one go/no-go with per-metric deltas' — going beyond naming the domain. It falls short of the 5 anchor because coverage has minor gaps (e.g., emitting the markdown/JSON artifact and the advisory-vs-blocking split are only implied by 'severity-aware'), and it is clearly above 3 since it enumerates multiple specific actions rather than 1-2.

Completeness

Both parts are explicitly present: the 'what' ('Combines... applies severity-aware thresholds... returns one go/no-go with per-metric deltas') and an explicit trigger clause ('Use when a deploy should be blocked by performance regressions from several tools'). It does not reach 5 because the 'when' covers a single scenario with one trigger phrase — it misses related triggers like per-PR perf delta reporting or advisory-only metric warnings — matching the 4 anchor where the 'when' could be more specific.

Trigger Term Quality

Natural phrases a user would say are present: 'deploy should be blocked', 'performance regressions', 'go/no-go', plus tool names (k6, JMeter, Gatling, Locust, Lighthouse, Web Vitals) that users of those tools would name directly. A few common variations are missing — 'perf budget', 'CI gate', 'load testing results', 'PR' — so it fits the 4 anchor ('good keyword coverage; a few natural terms missing') rather than the comprehensive synonym coverage of 5, and is well above the sparse keyword level of 2-3.

Distinctiveness Conflict Risk

It carves out a clear niche — a unified multi-runner CI performance gate with named tools, main-branch baselines, and a go/no-go verdict — with triggers unlikely to fire for unrelated skills. This matches the 5 anchor ('clear niche with distinct triggers; minimal conflict risk'); the only conceivable overlap is with single-runner skills, and the 'several tools' qualifier explicitly excludes them, so 4 would understate it.