Conciseness

The body is dense and almost entirely Harness-specific knowledge Claude would not have (spread: PER vs ACROSS semantics, 404 window/scope caveats, pagination totality behavior, attribution key rule), assuming competence on generic concepts. It sits at anchor 4 rather than 5 due to minor tightening opportunities, e.g., "Don't health-check metrics you're explicitly ruling out" is stated both at the end of Phase 6 and again in Performance Notes.

Actionability

Guidance is fully executable for an instruction-only skill: exact MCP tool names and params ("harness_get · fme_experiment · params: { experiment_id }"), CLI equivalents, specific fields to read ("keyMetrics / supportingMetrics", "baseEventTypes[].eventTypeId"), decision rules with reasons, and a copy-ready output template with a gap-handling section. Matches anchor 5.

Workflow Clarity

Eight numbered phases with a clear sequence, an explicit stop condition ("if it's an experiment and the user hasn't stated a hypothesis, ask for one before recommending a primary metric"), a validation checkpoint (Phase 6 requires exact Get event type for every event reference before recommending), and error-recovery feedback loops (the Troubleshooting table and the 404 → check scope/spelling → confirm-idle-before-reinstrumenting path). Matches anchor 5; no destructive/batch cap applies since the skill is read-only.

Progressive Disclosure

The SKILL.md keeps decision logic inline and pushes detail to one-level-deep, well-signaled references with section anchors (metric-design.md, tool-map.md, concepts.md, scope-establishment.md) cited at the point of need; no bundle files exist alongside it, and the small inline Tools table is load-bearing for every run. This fits anchor 5's clear-overview, one-level-deep reference structure rather than anchor 4, which requires organizational gaps.

Specificity

The description lists multiple concrete actions — "Recommend primary/guardrail metrics", "Checks existing metrics and event health", "surfaces auto-created guardrails" — plus an explicit non-goal boundary ("Doesn't create or attach metrics"), giving comprehensive coverage of the skill's capabilities. It exceeds anchor 4 because there are no meaningful gaps within the metric-selection domain it claims.

Completeness

Both questions are explicitly answered: a concrete "what" (recommend, check, surface, and an explicit exclusion) and a concrete "when" in the form of explicit trigger phrases. This matches anchor 5 exactly and is not anchor 4, since the "when" clause is fully explicit rather than merely present.

Trigger Term Quality

"Trigger phrases: choose/pick a metric, primary metric, guardrail metric, what to monitor" provides good natural-keyword coverage with a synonym pair and a question phrasing. It falls short of anchor 5 because common variations like "which metric should I use", "what should we measure", or "A/B test metric" are missing.

Distinctiveness Conflict Risk

"Doesn't create or attach metrics — see create-metric / instrument-metric / manage-experiments" explicitly fences off the sibling skills, and the trigger phrases (primary/guardrail metric, what to monitor) form a clear niche. Minimal conflict risk, matching anchor 5.