Conciseness

The body is dense and table-driven with minimal prose padding, but the opening "How It Works" paragraph explains concepts Claude already knows ("Redis is an in-memory data structure store that supports strings, hashes, lists...", "connection pools are essential to avoid per-request handshake overhead"), and the 'always set a TTL' advice is repeated in both the TTL Strategy section and the Anti-Patterns table. These are minor instances of over-explanation that could be trimmed, matching the 4 anchor rather than the lean 5 anchor or the noticeably padded 3 anchor.

Actionability

Virtually every section provides complete, copy-paste-ready code with concrete parameters: cache-aside with `setex(cache_key, 3600, ...)`, an atomic Lua sliding-window script, `SET NX PX` lock acquisition with token-checked Lua release, stream consumer groups with `xreadgroup`/`xack`, and ConnectionPool/Sentinel/RedisCluster configs with real timeouts and limits. This matches the 5 anchor 'fully executable; copy-paste ready code covering the common cases'.

Workflow Clarity

As a pattern-reference skill, it provides clear selection sequencing ('When to Activate' triggers, a Quick Reference pattern table, and scenario-to-pattern Examples), plus some correctness checkpoints like re-checking the cache after acquiring the stampede lock and releasing locks in a `finally` block. However, there are no explicit validation/retry checkpoints for riskier operations (e.g., verifying lock possession before acting, handling failed `xgroup_create` beyond a bare `except: pass`, or validating before bulk deletes), placing it at the 4 anchor with 'most checkpoints present; minor validation gaps' rather than the 5 anchor's explicit validate-fix-retry loops.

Progressive Disclosure

No bundle files exist, so the entire ~400-line reference — spanning eight topic areas (caching, sessions, rate limiting, locks, pub/sub, streams, connection management, eviction) — is inlined in a single SKILL.md. Section headers and tables give it reasonable structure, but this breadth is exactly the content that could be split into one-level-deep reference files (e.g., rate-limiting.md, locks.md) with the body kept as an overview, matching the 3 anchor 'some structure but... content that should be separate is inline'. It is above the 2 anchor because navigation via the Quick Reference table is clear, but below the 4 anchor since no progressive disclosure mechanism exists at all.

Specificity

The description enumerates specific capability areas — "caching strategies, distributed locks, rate limiting, pub/sub, and connection management" — but presents them as noun phrases rather than concrete verb-actions (cf. the 5 anchor's "Extract text and tables... fill forms, merge documents"). Coverage is broad with only minor gaps (e.g., session storage is not named), which fits the 4 anchor 'several specific actions; minor gaps in coverage' better than the 5 anchor's fully action-verb, comprehensive form.

Completeness

Both parts are explicit: the first sentence clearly states what the skill covers, and the second gives a concrete "Use when adding caching, a distributed lock, rate limiting, or pub/sub with Redis, or when key design needs review" trigger clause. This mirrors the 5 anchor's exemplar structure almost exactly, and is clearly above the 4 anchor where the 'when' is only generically phrased.

Trigger Term Quality

Natural trigger terms users would say are well covered: "adding caching", "a distributed lock", "rate limiting", "pub/sub", "Redis", and "key design needs review". It falls short of the 5 anchor's comprehensive synonym coverage — common variations like 'throttling', 'session storage', 'Redis Streams', or 'eviction' are absent, matching the 4 anchor 'good keyword coverage; a few natural terms missing'.

Distinctiveness Conflict Risk

"Redis" anchors a clear niche, and most triggers are Redis-specific, so conflict risk is low. However, generic triggers like "adding caching" could also fire for a general caching or database-persistence skill, so it sits at the 4 anchor 'mostly distinct; minor overlap risk' rather than the 5 anchor's fully distinct trigger set.