Postcard for Grok
com.clawhard/postcard
Check a link's share card on X, Facebook, LinkedIn: real image size, tag problems, fixed tags.
client:Grok
transport:streamable-http
tools:2
Install Postcard in Grok
.mcp.json (in your project root)
{
"mcpServers": {
"postcard": {
"type": "http",
"url": "https://postcard.clawhard.com/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