LightScout MCP
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| CHROME_PATH | No | /usr/bin/chromium | |
| PUPPETEER_SKIP_CHROMIUM_DOWNLOAD | No | true |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {
"listChanged": true
} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| analyze_performanceA | Run Lighthouse on a URL and get Core Web Vitals scores, metrics, and prioritized recommendations. Returns LCP, FCP, CLS, TBT, SI, TTFB with good/needs-improvement/poor ratings. |
| compare_performanceA | Compare Core Web Vitals between two URLs, or the same URL on mobile vs desktop. Shows per-metric deltas with winner indicators. |
| check_thresholdA | Pass/fail check against performance thresholds. Use for CI quality gates. Defaults use Google's 'poor' thresholds — only fails if metrics are genuinely bad. |
| crawl_siteA | Discover all pages on a site (via sitemap.xml or link crawling) and run Lighthouse on each. Returns per-page results plus site-wide summary with avg/min/max scores and common issues. Max 20 pages, 3 parallel runs. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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