Dense, well-structured content — layered check lists, threshold tables, tier definitions, and a failure-pattern catalog — that assumes Claude's competence and explains no generic concepts (the SLO/error-budget framing is operational, not padding). The short rhetorical section openers aid navigation rather than inflate tokens, so it sits at the 'lean, every token earns its place' anchor rather than the 'mostly efficient but could be tightened' score-2.

Instruction-only yet highly actionable: concrete thresholds ('more than 2 consecutive failed checks', 'p95 doubled in 5 minutes', 'Error rate above 1% for 5 minutes'), specific escalation timing ('5-15 minutes'), an SLO downtime table, a per-box check matrix, and a copy-paste-ready audit checklist. The scoring note permits absence of code for instruction-only skills when guidance is this specific, so it clears the score-3 bar over the 'incomplete/missing key details' score-2 anchor.

An explicit 8-step sequence (Inventory → Map → Define SLOs → Configure checks → Tier → Route → Dashboards → Audit) with per-step sub-guidance and a built-in feedback loop in Step 8's quarterly alert audit. The cap-at-2 rule applies only to destructive/batch operations, which this design skill is not, so it reaches the 'clear sequence with feedback loops' anchor.

The body is a well-organized overview (4 layers, SLOs, workflow, failure patterns, output format) with a single well-signaled one-level-deep reference to references/slo-design-guide.md — a real file verified to exist — for deep SLO design. Content is appropriately split and navigation is easy, matching the score-3 anchor rather than the 'content that should be separate is inline' score-2.

Lists multiple concrete actions — 'setting up uptime checks, defining SLOs, configuring error tracking, choosing what to alert on, designing on-call rotations, or fixing alert fatigue' — far beyond the score-2 'names domain and some actions' anchor. Voice is third person ('Design and run'), so no specificity penalty.

Answers both 'what' ('Design and run a monitoring system for a website or web app') and 'when' with an explicit 'Use this skill when...' clause plus a 'Triggers on...' list. Matches the score-3 anchor requiring explicit triggers for both halves.

Explicit 'Triggers on monitoring, alerts, uptime, SLO, SLA, error rate, on-call, pager, alert fatigue, observability, dashboards, what should we monitor' gives broad coverage of terms a user would naturally say. Not score 2, which expects missing common variations — the list is comprehensive and includes colloquial phrasings like 'what should we monitor'.

Clear monitoring/alerting niche with distinct triggers (uptime, SLO, on-call, pager, alert fatigue) unlikely to fire for unrelated skills. A couple of broad terms (observability, dashboards) carry mild overlap risk, but the core niche is well-defined enough to stay at 3 rather than the 'could still overlap' score-2 anchor.