WSG Check runs on your own machine — the client starts it, so there is no endpoint to ping. 52 installs a week from npm. Last commit 14 Oct 2026.
Check websites against the W3C Web Sustainability Guidelines and look up the guidelines
Nothing serious here today
Today is the operative word: we check WSG Check every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add wsg-check -- npx -y @sustainablewebsites/wsg-check{
"mcpServers": {
"wsg-check": {
"command": "npx",
"args": [
"-y",
"@sustainablewebsites/wsg-check"
]
}
}
}[mcp_servers.wsg-check]
command = "npx"
args = ["-y", "@sustainablewebsites/wsg-check"]{
"mcpServers": {
"wsg-check": {
"command": "npx",
"args": [
"-y",
"@sustainablewebsites/wsg-check"
]
}
}
}{
"servers": {
"wsg-check": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@sustainablewebsites/wsg-check"
]
}
}
}Optional settings from the registry entry, left out of the block above:
WSG_CHECK_NO_LOCAL (Set to 1 to block localhost and other loopback URLs, which are allowed by default), WSG_CHECK_ALLOW_PRIVATE (Set to 1 to allow private network URLs (10/8, 172.16/12, 192.168/16)).
Alternatives to WSG Check
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WSG Check — questions
Answers built from our own checks of this server.