Conciseness

The body is dense with practitioner knowledge Claude does not hold canonically (coordinated omission, stress vs breakpoint distinction, warm-up traps, the Gatling 'users means open' trap) and does not pad with basics. Minor trimmable fat remains: the opening paragraph defines what load testing is, and several long verbatim doc quotes (JMeter protocol list, k6 open/closed passages) could be condensed. Fits the 4 anchor (efficient, minor over-explanation) rather than 5 (every token earns its place) or 3 (noticeably verbose).

Actionability

Fully executable throughout: a complete copy-paste k6 script with thresholds, install commands for four platforms, run commands, two working jq one-liners for parsing summary.json and plan.json, an ordered first-match decision table, and concrete parameters in the incident workflow (30-second profile capture, top 5 leaf frames, classification categories). Matches the 5 anchor: copy-paste ready commands covering the common cases.

Workflow Clarity

The incident workflow has an explicit sequenced structure with validation checkpoints and feedback loops: Step 1 gates on threshold pass/fail ('If the run passes all thresholds... state that explicitly and stop'), Step 2 branches on DB-bound frames ('proceed directly to Step 3') and handles the no-profiler blocker, and Step 4 ends with a re-run of the confirmation test after the fix. This matches the 5 anchor (clear sequence, explicit validation, feedback loops); a 4 would lack some of these checkpoints.

Progressive Disclosure

The SKILL.md body is a well-organized overview that keeps only the k6 quick start and decision logic inline and splits the deep material into four real, clearly signaled, one-level-deep files (references/gatling.md, references/locust.md, references/tool-executors.md, references/traps.md), each announced with a description of its contents. Verified against the actual bundle: all four files exist and none nest further references. Matches the 5 anchor.

Specificity

The description lists multiple concrete actions with comprehensive coverage: 'a tool-selection table choosing between k6, JMeter, Gatling, Locust, and Artillery', 'the six load profiles (smoke, average-load, stress, spike, soak, breakpoint)', 'turning a run into a pass/fail CI gate with a first runnable k6 script', and a step-named incident triage workflow. It matches the 5 anchor (multiple specific concrete actions, comprehensive) rather than 4, which would require minor gaps in coverage.

Completeness

Both questions are answered explicitly: a detailed 'what' (tool selection, load profiles, workload models, percentile gating, incident triage, Gatling/Locust deep dives) and a concrete 'when' ('Use when a service needs performance coverage and the tool, load profile, or pass/fail threshold has not been decided yet, or when a live performance incident needs cause localization'). This matches the 5 anchor exactly; a 4 would have a less specific when-clause. Third-person voice throughout, so no penalty applies.

Trigger Term Quality

Good keyword coverage: 'load and performance testing', all five tool names, 'stress, spike, soak', 'percentiles', 'pass/fail CI gate', 'performance incident'. A few natural user terms are missing ('benchmark', 'scalability', 'capacity', 'throughput'), so it fits the 4 anchor (good coverage, a few natural terms missing) rather than 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The pre-decision niche (tool/profile/threshold not yet chosen, plus incident cause localization) is distinct, but the description also covers 'a first runnable k6 script' and 'confirm with a k6 smoke run', overlapping the named k6-load-testing and jmeter-load-testing skills. This is the 4 anchor (mostly distinct, minor overlap risk with closely related skills) rather than 5's minimal conflict risk.