Measure Core Web Vitals and debug web performance with 56 snippets in a headless Chromium
Connect Runs on your machine
claude mcp add webperf-snippets -e CRUX_API_KEY=<CRUX_API_KEY> -- npx -y [email protected]
{
"mcpServers": {
"webperf-snippets": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}
{
"mcpServers": {
"webperf-snippets": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}
{
"servers": {
"webperf-snippets": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
CRUX_API_KEYOptional, secret | Chrome UX Report API key for the field data of get_crux; the other tools work without it |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 10 Nov 2026 |
| Last updated | 10 Nov 2026 |
| Registry name | io.github.nucliweb/webperf-snippets |
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