What problem does it solve? SEO and performance pipelines need Core Web Vitals data (TTFB and CLS) to diagnose page speed issues, but live measurement requires network access and external APIs. This Skill provides deterministic synthetic performance metrics from a local dataset so agents can run speed diagnostics offline. ## Core Features & Use Cases - Synthetic Performance Retrieval: Looks up TTFB and CLS scores for a URL from the synthetic-seo-data performance corpus, with device-type filtering and domain-level fallbacks. - Threshold Classification: Classifies TTFB and CLS scores as green, amber, or red using fixed Core Web Vitals thresholds. - Bottleneck Detection: Applies heuristic rules to resource breakdown data (JS, images, fonts, third-party bytes) to flag likely performance bottlenecks. - Use Case: A deep-scan-agent running a baseline performance measurement calls this Skill with a page URL and receives classified TTFB/CLS scores plus a list of likely bottlenecks, without any live network calls. ## Quick Start Ask the agent to get the mobile speed metrics and likely bottlenecks for https://example.com/product-page using the speed-checker skill.
