Conciseness

Nearly every line is an operational rule or example URL with no padding about concepts Claude already knows. A few justificatory asides ("a wrong URL sends the user to a dead end with full confidence", "an invented URL only costs the user trust") could be trimmed without losing guidance.

Actionability

Fully executable for an instruction-only skill: exact search strings ("<service> API authentication", "<service> dashboard API keys"), concrete tool calls (research(action="web-search"), fetch-url), verbatim example URLs (console.apify.com/settings/integrations, elevenlabs.io/app/settings/api-keys), and an ordered endpoint-priority list with explicit omit-on-failure fallbacks.

Workflow Clarity

Four clearly sequenced steps with explicit stop conditions ("If the documented auth is basic, digest, or OAuth, stop"), verification checkpoints ("must appear on a page you fetched", "appears VERBATIM on a page you fetched"), and feedback paths for failure (omit docsUrl / omit testUrl rather than guess). This is research, not destructive/batch work, so no validation cap applies.

Progressive Disclosure

Well-organized sections with a coherent single-procedure layout and no bundle files to reference. Not 5: the body is ~75 lines (above the under-50-line simple-skill exception) and its cross-skill pointers ("the workflow-builder skill's credential ladder", "the post-build-flow skill") are named but not linked, leaving minor navigation gaps.

Specificity

Names multiple concrete actions — "sources the auth template, the key-issuing docsUrl and an auth-rejecting testUrl from the provider's real documentation instead of memory" — covering the skill's full scope in third-person voice. Not 4 because there are no gaps: all three recipe fields are enumerated as explicit lookup actions.

Completeness

Explicitly answers both: what ("Lookup procedure for Simplified Custom Auth recipe fields") and when ("Load before composing credentialHints... or when asked to fix a recipe whose template, key page or test endpoint is wrong"). Clear what-and-when pairing with concrete trigger phrasing matches the top anchor.

Trigger Term Quality

Natural trigger phrases like "fix a recipe whose template, key page or test endpoint is wrong" and "composing credentialHints" match what a user in this workflow would say. Not 5 because common synonyms a user might naturally use ("API key", "credentials", "docs page") are only implied, never stated.

Distinctiveness Conflict Risk

A narrow niche (n8n Simplified Custom Auth recipe fields) with distinct triggers tied to recipe construction and repair. Conflict risk with generic research or docs skills is minimal since the triggers name the exact fields and workflow context.