Conciseness

The body is entirely imperative directives with zero padding — it never explains what OAuth, n8n, or browser automation is, and lines like "Reading docs, reaching a dashboard, enabling an API, or seeing a settings page is not completion" earn their tokens by disambiguating termination. Matches anchor 5 ('lean and efficient; every token earns its place').

Actionability

For an instruction-only skill the guidance is fully actionable: exact tool names with parameters throughout (`research(action="fetch-url")`, `browser_capture_secret` with `ref`/`redactedKey`/`credentialsKey`, `browser_create_credential` with `data` vs `resolveData`, `interactive: false` for static text). Per the rubric's code-vs-instruction note, absence of code snippets is not penalized since the guidance names the exact calls, parameters, and conditions. Not 4 because there is no high-level hand-waving — each instruction specifies the tool and its arguments.

Workflow Clarity

The 5-step Default Procedure is clearly sequenced with explicit checkpoints: fresh `browser_snapshot` before any interaction (stale-ref guard), page-state inspection after navigation/clicks, explicit termination conditions ("Continue until the credential can be created... or a real blocker is reached"), and a closeout step re-invoking the setup tool after creation. Error handling is present ("If browser tools are unavailable, disconnected, or permanently denied, stop and explain"). Not 4 because checkpoints are explicit at every phase rather than mostly present.

Progressive Disclosure

This is a compact self-contained skill: no references/, scripts/, or assets/ directories exist, and the body (well under ~60 lines) needs none — everything is appropriately inlined under clear sections (Default Procedure, Secrets, Browser Discipline, Closeout). Fits the rubric's simple-skill exception: well-organized sections with no need for external references score 5.

Specificity

"Guides n8n credential setup through Computer Use browser tools" names the domain and a single composite action, but does not break that into several distinct concrete capabilities (e.g., locating values in provider consoles, capturing secrets, creating the n8n credential). It sits at anchor 3 ('names domain and 1-2 concrete actions'); not 4 because the enumerated items ("OAuth apps, API keys, client IDs, client secrets") are trigger inputs rather than actions the skill performs, and not 2 because the domain and mechanism are concretely named.

Completeness

Both parts are explicit: the 'what' ("Guides n8n credential setup through Computer Use browser tools") and a concrete 'Use when...' trigger clause enumerating the exact situations ("Use when a user needs OAuth apps, API keys, client IDs, client secrets, or other credential values from an external service console"). Third person voice is used correctly. Clearly matches anchor 5.

Trigger Term Quality

Natural user phrasing is well covered: "OAuth apps", "API keys", "client IDs", "client secrets", "credential values", "external service console", "n8n credential". Not 5 because common variations like "secrets", "API credentials", "service provider" (vs "external service"), or specific provider names are missing.

Distinctiveness Conflict Risk

The niche is clear (n8n credentials via Computer Use browser tools) and mostly distinct, but the catch-all "or other credential values from an external service console" could over-trigger for cases where the user already holds the value and only needs it entered, or for non-browser credential entry. This is minor overlap risk with closely related skills — anchor 4 rather than 5.