Browser Compat MCP Server is answering right now. Last checked 4 min ago. 457 installs a week from npm. It exposes 5 tools. Last commit 20 Sep 2026.
Browser compatibility and Baseline status for any web feature — offline, from bundled MDN data.
Over the last week it answered 99.1% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.
claude mcp add browser-compat-mcp-server --transport http https://browser-compat.caseyjhand.com/mcp
{
"mcpServers": {
"browser-compat-mcp-server": {
"url": "https://browser-compat.caseyjhand.com/mcp"
}
}
}
[mcp_servers.browser-compat-mcp-server]
url = "https://browser-compat.caseyjhand.com/mcp"
{
"mcpServers": {
"browser-compat-mcp-server": {
"url": "https://browser-compat.caseyjhand.com/mcp"
}
}
}
{
"mcpServers": {
"browser-compat-mcp-server": {
"url": "https://browser-compat.caseyjhand.com/mcp"
}
}
}
This one needs environment variables set before it will start:
MCP_HTTP_HOST (The hostname for the HTTP server.), MCP_HTTP_PORT (The port to run the HTTP server on.), MCP_HTTP_ENDPOINT_PATH (The endpoint path for the MCP server.), MCP_AUTH_MODE (Authentication mode to use: 'none', 'jwt', or 'oauth'.), MCP_LOG_LEVEL (Sets the minimum log level for output (e.g., 'debug', 'info', 'warn').).
The author declared them in the registry entry; get the values from the project itself.
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
browsercompat_check_baseline
browsercompat_compare_support
browsercompat_get_feature
browsercompat_list_reference
browsercompat_search_features
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://browser-compat.caseyjhand.com/mcp | streamable-http | answering | 412 ms | 4 min ago |
What CSS you can actually ship today, from live Baseline data and MDN browser-compat-data.
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Answers built from our own checks of this server.