Measure Core Web Vitals and debug web performance with 56 snippets in a headless Chromium
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add webperf-snippets --env CRUX_API_KEY='<CRUX_API_KEY>' -- npx -y webperf-snippets~/.codex/config.toml
[mcp_servers.webperf-snippets]
command = "npx"
args = ["-y", "webperf-snippets"]
env = { CRUX_API_KEY = "<CRUX_API_KEY>" }
# codex mcp add webperf-snippets --env CRUX_API_KEY='<CRUX_API_KEY>' -- npx -y webperf-snippets~/.cursor/mcp.json
{
"mcpServers": {
"webperf-snippets": {
"command": "npx",
"args": [
"-y",
"webperf-snippets"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"webperf-snippets": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"webperf-snippets"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"webperf-snippets": {
"command": "npx",
"args": [
"-y",
"webperf-snippets"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}claude_desktop_config.json
{
"mcpServers": {
"webperf-snippets": {
"command": "npx",
"args": [
"-y",
"webperf-snippets"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}.trae/mcp.json
{
"mcpServers": {
"webperf-snippets": {
"command": "npx",
"args": [
"-y",
"webperf-snippets"
],
"env": {
"CRUX_API_KEY": "<CRUX_API_KEY>"
}
}
}
}Environment variables
CRUX_API_KEY
Replace the placeholders with your own credentials and keep them out of version control.