Conciseness

The body is dense and efficient — tables, terse rules, and minimal complete code — but "Always use actionTypes when comparing action.type" is repeated (in References and again in Reading and Consuming Actions), and the dispatcher/accessor method lists duplicate content already in Controller.md. This fits 'efficient; minor instances of over-explanation that could be trimmed' rather than the every-token-earns-its-place level at 5.

Actionability

Three complete, executable TypeScript examples (TimeManager with full init/cleanup, LoggingManager, CustomSubsManager) plus DataProvider wiring cover the common cases and are copy-paste ready, matching the top anchor; the stubbed subscribe/unsubscribe methods are clearly illustrative rather than pseudocode.

Workflow Clarity

Building a Manager follows a clear, well-sequenced path (responsibility → lifetimes → cleanup rules → use-case selection → dispatch/consume → usage) with lifecycle checkpoints like "Don't reset state about the store... in cleanup()" and the manager-ordering rule. It lacks explicit validation feedback loops, so it does not reach 5, but as a code-authoring guide it involves no destructive or batch operations that would cap it at 3.

Progressive Disclosure

The body is a genuine overview: every detailed API doc lives one level deep in references/ (all six linked files verified to exist), and each named section in the use-case table ("Middleware logging", "Error reporting", "Cross-tab synchronization", etc.) was verified to exist in managers.md. This matches the clear-overview, well-signaled, one-level-deep anchor.

Specificity

The description enumerates multiple concrete capabilities — "reacts to every request or to events from outside the app and updates the store", "websockets, SSE and polling", "error toasts and reporting, logging and analytics, auth failures, refetching on focus or reconnect, and cross-tab sync" — with no coverage gaps in the domain, matching the comprehensive-coverage anchor rather than the minor-gaps anchor at 4.

Completeness

It explicitly answers both what ("Write @data-client Managers for app-wide side effects and real-time data... updates the store") and when ("Use one instead of useEffect for behavior that belongs to the whole app, such as...") with concrete trigger phrases, exactly matching the top anchor.

Trigger Term Quality

It includes natural phrases users would say when needing this skill ("websockets", "polling", "error toasts", "analytics", "auth failures", "refetching on focus or reconnect", "cross-tab sync", "useEffect") with synonyms woven in, which is comprehensive coverage rather than the 'a few natural terms missing' level at 4.

Distinctiveness Conflict Risk

It is anchored to the specific "@data-client Managers" concept with a distinct trigger ("instead of useEffect"), giving it a clear niche with minimal conflict risk against generic React or state-management skills.