ExpressNumber for Grok
com.expressnumber/mcp
Private US phone numbers for your AI assistant: list your numbers, read their texts, get a new one.
client:Grok
transport:streamable-http
Install ExpressNumber in Grok
.mcp.json (in your project root)
{
"mcpServers": {
"mcp": {
"type": "http",
"url": "https://www.expressnumber.com/api/mcp"
}
}
}Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs