Conciseness

The body is dense, project-specific policy with no padding about concepts Claude already knows — every paragraph carries rules Claude couldn't infer. It stays at 4 rather than 5 because of minor redundancy (the secure-credential-path rule is restated across the Rule and custom-setup-page paragraphs) and a few convoluted sentences like "Model onboarding around the logical connection outcome, not its individual fields" that could be tightened.

Actionability

The guidance is fully executable: a complete copy-paste TypeScript example with imports and an isComplete callback, exact API names (registerOnboardingStep, hasOAuthTokens, registerRequiredSecret, WORKSPACE_SERVICES, getOnboardingAppProfile, manage-file-storage), and real file paths for follow-up. This matches the anchor for copy-paste-ready code with specific examples covering the common cases.

Workflow Clarity

The core action (register an onboarding step) is unambiguous and demonstrated in code, and the decision rules (custom setup page criteria, WORKSPACE_SERVICES additions, app-specific capabilities) are individually clear. It sits at 4 rather than 5 because the skill interleaves several decision processes without explicit sequencing or checkpoints, and at 4 rather than 3 because every branch states what to do and what to avoid.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), so everything lives in a well-sectioned ~90-line body with clear headers. The one external pointer ("See packages/core/docs/content/onboarding.md for method kinds and built-in steps") is well-signaled and one level deep, but the ~25-line WORKSPACE_SERVICES section is detailed inline where a reference file would keep SKILL.md a leaner overview — matching the good-structure-with-minor-gaps anchor 4.

Specificity

The description names the domain and several concrete specifics — "register user-facing setup steps (API keys, OAuth, connecting third-party services) for the sidebar setup checklist" — matching the anchor that lists several specific actions with minor coverage gaps. It falls short of a 5 because it describes one composite action (registering steps) rather than a comprehensive list of capabilities.

Completeness

Both parts are explicit: the what ("register user-facing setup steps ... for the sidebar setup checklist") and the when ("Use when adding a feature that needs initial user configuration"). The when clause is a single fairly general condition without additional concrete trigger phrases, matching anchor 4 ('when' could be more explicit or specific) rather than the fully-trigger-anchored 5.

Trigger Term Quality

Natural terms users would say are present: "API keys", "OAuth", "connecting third-party services", "setup checklist", "initial user configuration". Coverage is good but misses common synonyms and adjacent phrasings such as "onboarding", "credentials", "first-run", or "secrets", so it fits the good-but-not-comprehensive anchor rather than 5 and clearly above the sparse-keyword anchor 3.

Distinctiveness Conflict Risk

"sidebar setup checklist" scopes this to a distinct niche with clear triggers, but the credential territory ("API keys, OAuth") creates minor overlap risk with adjacent skills like the referenced `authentication` and `secrets` skills. That places it at mostly-distinct (4) rather than the minimal-conflict 5, and well above the generic anchors 2–3.