Conciseness

Almost every line carries Vercel-specific, non-inferable facts (draft/publish staging semantics, plan gates like "over 600 Enterprise only", "Counters are per region", persistent-action caveats) with no generic-concept padding. Falls short of anchor 5 due to genuine duplication: "collide with real users far more often than they look like they will" appears in both the rollout bullet and the Don't-over-block bullet, and the "5–10× the expected legitimate rate" + "--rate-limit-action log" advice appears in both the Rate limit section and Best practices.

Actionability

Fully executable, copy-paste-ready commands throughout: complete JSON condition payloads ("--condition '{\"type\":\"path\",\"op\":\"inc\",\"value\":[\"/wp-admin\",\"/.env\"]}'"), exact flags with value ranges ("--rate-limit-window\" seconds 10–3600, "--rate-limit-requests 1–10,000,000"), and even the dashboard URL construction with where to find team/project slugs (".vercel/project.json (`orgSlug` / `projectName`)"). Matches anchor 5's fully-executable, common-cases-covered standard.

Workflow Clarity

The staged rollout is a clearly sequenced 4-step process (Log everywhere → user reviews dashboard traffic → Block in preview first → Block in production) with explicit validation checkpoints between stages ("Have them confirm only the intended traffic is matching", "Re-check the dashboard URL filtered by rule ID") and rollback paths ("roll back with `--action log` or `rules disable`"). This is a destructive-capable, production-affecting domain and the required feedback loops are present, so the ≤3 cap for missing validation does not apply; it matches anchor 5.

Progressive Disclosure

The single SKILL.md runs ~305 lines with zero bundle files — no references/, scripts/, or assets/ exist — so all content is inline. Section structure is good and navigable, but bulk reference material sits inline where the rubric expects splitting: the operators list ("eq/neq (equals), sub (contains), pre (starts-with)…"), the condition-type taxonomy, the rate-limit flag reference, and the traffic-dimension listings. That matches anchor 3 ("content that should be separate is inline") rather than anchor 4, which expects the bulk of reference detail in a separate file.

Specificity

The description enumerates concrete, specific capabilities — "automatic DDoS mitigation, the Vercel WAF (custom rules, IP blocking, managed rulesets, rate limiting), Attack Mode, system bypass, bot management, and the `vercel firewall` CLI" — with comprehensive domain coverage. It falls just short of anchor 5 because it lists feature nouns rather than the concrete action verbs ("configure", "block", "publish") that the top anchor's verb-object style requires; it is well above anchor 3's '1-2 concrete actions'.

Completeness

Both questions are answered explicitly: the 'what' is "Vercel Firewall expert guidance" with every subsystem enumerated, and the 'when' is "Use when configuring platform-level security, responding to attacks, or staging firewall rules" — three concrete trigger scenarios. This matches the anchor-5 example's what-plus-when-with-triggers pattern; anchor 4 would require the 'when' to be less explicit than it is.

Trigger Term Quality

Natural phrases a user would actually say are present: "DDoS mitigation", "custom rules", "IP blocking", "rate limiting", "Attack Mode", "bot management", "staging firewall rules". Not anchor 5 because common variations are missing — e.g., "block an IP", "WAF rules", "DDoS protection", "under attack" — leaving a few natural synonyms uncovered; well above anchor 3's partial coverage.

Distinctiveness Conflict Risk

"Vercel Firewall expert guidance" and the "`vercel firewall` CLI" anchor the skill to a single product niche with distinct, product-specific triggers — a user mentioning Vercel firewall/WAF/DDoS would unambiguously want this skill and no other. Minimal conflict risk, matching anchor 5.