Conciseness

The body is lean and telegraphic with no explanations of concepts Claude already knows ("Strip flags; one explicit mode token wins"), but the sentence "Historical provider field notes, adapted 2026-09-30: DNS record `type`, `host`, `ttl`, `rdata`..." inlines time-sensitive dated material rather than placing it in an 'old patterns'/'deprecated' section, which the guidelines penalize. This fits anchor 4 — efficient with a minor instance that could be trimmed — rather than anchor 5, and is well above anchor 3 since nothing else is padded.

Actionability

Guidance is highly concrete: exact env var/header mappings (`EURODNS_APP_ID` -> `X-APP-ID`), a copy-paste shell command for `.env` sourcing, a full EN/RU keyword table, and verification URLs. However, the core operation has no example API request and no concrete method for performing the mandated schema verification, matching anchor 4 ('mostly executable guidance with minor gaps') rather than anchor 5's coverage of common cases.

Workflow Clarity

The four-step Operation sequence has explicit validation checkpoints for destructive operations — GET-before-write, before/after preview with explicit approval, provider check validation for whole-zone PUT, and post-execution GET-and-compare — plus a feedback loop ("If the outcome is uncertain, GET and reconcile before retry; do not blindly replay writes") and IP-auth error recovery with wait-confirm-then-one-retry. This matches anchor 5 exactly; anchor 4 is too low because checkpoints are explicit, not merely present.

Progressive Disclosure

There are no bundle files (references/, scripts/, assets/ all absent), and the body is under 50 lines with no need for external references, organized into clear sections (mode resolution, Provider contract and credentials, Operation, error handling). Per the rubric's simple-skill guideline this scores 5; anchor 4 would require organization gaps that do not exist.

Specificity

"Show or modify explicitly requested EuroDNS records" names the domain plus two concrete actions, while the remaining phrases ("schema verification, GET-before-write, concrete previews, whole-zone replacement approval") are procedural modifiers rather than distinct capabilities; add/create/delete are never individually named, so coverage is not comprehensive as anchor 4 requires.

Completeness

The 'what' is clear (show/modify EuroDNS records with safety procedures), but there is no 'Use when...' clause or equivalent explicit trigger guidance, which per the judging guidelines caps completeness at 3; it is above anchor 2 because the 'what' is concrete rather than vague.

Trigger Term Quality

"EuroDNS records" is a natural, distinctive phrase a user would say, but common variations and synonyms ("DNS records", "zone", "domain", "URL forward", "mail forward") are absent, matching anchor 3's 'missing common variations or synonyms' rather than anchor 4's good keyword coverage.

Distinctiveness Conflict Risk

"EuroDNS" names a specific DNS provider, creating a clear niche with distinct triggers and minimal conflict risk with generic DNS or unrelated skills, exactly matching anchor 5; it does not fall to anchor 4 since overlap risk is negligible.