Conciseness

The body is dense with concrete curl/pytest/CI examples and assumes competence (no 'what is a CDN' padding), but the cf-cache-status values are explained twice — once in the 'Cache-Status header verification' table and again in 'Parsing results' — and the multi-region example partially repeats the canonical test. These minor redundancies keep it below the lean 'every token earns its place' anchor.

Actionability

Vendor-specific curl commands, an executable canonical pytest, and CI YAML are copy-paste shaped, but the multi-region example calls an undefined helper `purge_url(API, ...)` and the CI steps invoke `./scripts/write-test-fixture.sh` and `./scripts/purge-test-paths.sh` which do not exist in the bundle. Concrete with minor gaps — not fully executable.

Workflow Clarity

The canonical test lays out a clear numbered sequence (origin write → verify old edge state → purge → wait → assert fresh) with asserts at each step, and the anti-patterns table supplies recovery guidance. However the examples themselves use fixed `time.sleep(10)`/`time.sleep(30)` waits that the skill's own anti-patterns table says to replace with polling — a minor internal validation inconsistency.

Progressive Disclosure

Browser-tier content is cleanly split into `references/browser-cache-control.md` and `references/playwright-cache-recipes.md`, both real files, clearly signaled and one level deep. The gap: the CI section references `./scripts/write-test-fixture.sh` and `./scripts/purge-test-paths.sh`, and no scripts/ directory exists in the bundle.

Specificity

The description enumerates multiple concrete actions — 'purges and invalidations on Cloudflare, Fastly (surrogate keys) and CloudFront, end-to-end write, purge and fresh-read checks, propagation delay and cache-status headers, plus browser Cache-Control, ETag and service-worker caching with Playwright' — comprehensively covering both edge and client tiers. Not 4: there are no meaningful coverage gaps; named vendors, headers, and check types leave nothing material unspecified.

Completeness

It opens with an explicit trigger clause — 'Use when CDN or browser caching needs tests' — and follows with a concrete 'what' listing the exact test types performed. Both what and when are explicit with concrete trigger phrases, matching the top anchor rather than the merely-adequate 4 anchor.

Trigger Term Quality

Strong natural keyword coverage: 'CDN', 'purge', 'invalidation', 'Cloudflare', 'Fastly', 'CloudFront', 'cache-status', 'ETag', 'service-worker', 'Playwright' — all phrasing a user with this need would say. Not 5: common user-side phrasings like 'stale content', 'cache busting', or 'cache hit/miss' are absent, so a few natural synonyms are missing.

Distinctiveness Conflict Risk

The niche is unambiguous: CDN-edge purge/invalidation testing on named vendors plus browser-tier cache verification with Playwright. Vendor names and the cache-focused trigger make it unlikely to fire for unrelated skills; overlap with generic Playwright testing skills is minimal because the caching scope is explicit.