Lists multiple specific concrete actions: configures/manages/debugs Fastly CDN, service and backend setup, caching and VCL, DDoS/WAF/NGWAF/rate limiting/bot management, TLS certificates, cache purging, Compute platform, REST API, logging endpoints, load balancing, ACLs, edge dictionaries.

Clearly answers both 'what' (configures, manages, debugs Fastly CDN with detailed feature list) and 'when' with an explicit 'Use when...' clause covering multiple trigger scenarios including working with Fastly services, setting up edge caching, configuring security, making API calls, troubleshooting errors, and configuring various features.

Excellent coverage of natural terms users would say: 'Fastly', '503 errors', 'SSL/TLS certificate mismatches', 'edge caching', 'origin shielding', 'WAF', 'rate limiting', 'bot management', 'cache purging', 'VCL', 'ACLs', 'edge dictionaries', 'Fastly API calls', 'DDoS'. These are terms users would naturally use when seeking help with Fastly.

Highly distinctive — anchored specifically to the Fastly CDN platform with Fastly-specific terminology (VCL, NGWAF, Compute platform, Fastly API, origin shielding). Very unlikely to conflict with generic CDN or web server skills due to the repeated Fastly-specific scoping.

The content is lean and efficient throughout. It assumes Claude's competence with VCL, CDN concepts, and API usage without explaining basics. Every section earns its place — the VCL recipes address non-obvious gotchas (grace detection, Vary append pitfalls, cookie parsing), and the common mistakes list is tightly curated with specific corrections.

All VCL recipes are fully executable, copy-paste ready code with correct syntax. The pre-flight checks provide specific curl and openssl commands. Common mistakes include exact corrections (e.g., '86400s' not '86400'). The guidance on token handling and API security is concrete and specific.

The Quick Start section provides a clear sequenced workflow with explicit pre-flight validation checks (verify origin responds, check TLS SANs) before any configuration. It delegates the full step-by-step to the fastly-cli skill's services.md reference appropriately. The VCL recipes each explain the correct subroutine context and warn about ordering pitfalls, serving as implicit validation checkpoints.

Excellent progressive disclosure with a well-organized topic table providing 20 reference files with clear 'Use when...' descriptions for each. The SKILL.md serves as a concise overview with actionable quick-start content and common recipes, while pointing to specific reference files for deeper topics. All references are one level deep and clearly signaled.