Conciseness

The body is dense and purposeful without explaining basics Claude already knows, though the Rules section restates the Workflow and the intro carries some rationale prose that could be trimmed.

Actionability

Concrete and actionable for an instruction-only skill — named MCP tools (insights, tables, functionSpec) and methods (.collect, .withIndex, .paginate, .take) plus a cost-class finding emission — but lacks concrete MCP call-syntax examples, leaving minor gaps.

Workflow Clarity

A clearly sequenced 7-step workflow (GUARD → REPORT) with explicit checkpoints: deploy-guard announcement, a 'no traffic yet' conditional fallback, and the confirm-cost gate before any metered action.

Progressive Disclosure

Under 50 lines with well-organized Workflow and Rules sections and no need for external bundle files; the simple-skill exception applies, so clear organization alone earns a 5.

Specificity

Lists multiple concrete actions — 'rank functions by bytes/documents-read × call-volume', 'project each cost driver's growth curve', 'name the cheapest fix', 'confirm-cost for paid actions' — with comprehensive coverage of the cost-preview workflow.

Completeness

The 'what' is clearly stated but there is no 'Use when…' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines.

Trigger Term Quality

Natural terms like 'Convex spend', 'cost', and 'paid actions' are present, but common synonyms (billing, budget, pricing) are missing and the mid-section leans on jargon ('bytes/documents-read × call-volume', 'insights').

Distinctiveness Conflict Risk

The Convex-cost niche is distinct and unlikely to fire for unrelated skills, but it deliberately overlaps convex-advisor (same evidence, money vs latency framing), creating minor overlap risk with a closely related skill.