Check websites against the W3C Web Sustainability Guidelines and look up the guidelines
Connect Runs on your machine
claude mcp add wsg-check -e WSG_CHECK_NO_LOCAL=<WSG_CHECK_NO_LOCAL> -e WSG_CHECK_ALLOW_PRIVATE=<WSG_CHECK_ALLOW_PRIVATE> -- npx -y @sustainablewebsites/[email protected]{
"mcpServers": {
"wsg-check": {
"command": "npx",
"args": [
"-y",
"@sustainablewebsites/[email protected]"
],
"env": {
"WSG_CHECK_NO_LOCAL": "<WSG_CHECK_NO_LOCAL>",
"WSG_CHECK_ALLOW_PRIVATE": "<WSG_CHECK_ALLOW_PRIVATE>"
}
}
}
}{
"mcpServers": {
"wsg-check": {
"command": "npx",
"args": [
"-y",
"@sustainablewebsites/[email protected]"
],
"env": {
"WSG_CHECK_NO_LOCAL": "<WSG_CHECK_NO_LOCAL>",
"WSG_CHECK_ALLOW_PRIVATE": "<WSG_CHECK_ALLOW_PRIVATE>"
}
}
}
}{
"servers": {
"wsg-check": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@sustainablewebsites/[email protected]"
],
"env": {
"WSG_CHECK_NO_LOCAL": "<WSG_CHECK_NO_LOCAL>",
"WSG_CHECK_ALLOW_PRIVATE": "<WSG_CHECK_ALLOW_PRIVATE>"
}
}
}
}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 |
|---|---|
WSG_CHECK_NO_LOCALOptional | Set to 1 to block localhost and other loopback URLs, which are allowed by default |
WSG_CHECK_ALLOW_PRIVATEOptional | Set to 1 to allow private network URLs (10/8, 172.16/12, 192.168/16) |
Details
| Package | @sustainablewebsites/[email protected] (NPM, stdio) |
| First published | 14 Oct 2026 |
| Last updated | 14 Oct 2026 |
| Registry name | io.github.ivanoats/wsg-check |
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