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mcp/harbor
Grok

once for Grok

io.github.stringsofthemind-oss/once

Execution-safety MCP for AI coding agents protecting consequential writes from unsafe retries.

client:Grok transport:stdio runtime:npm

Install once in Grok

.mcp.json (in your project root)

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "once": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@once-agent/mcp"
      ],
      "env": {
        "ONCE_API_KEY": "<ONCE_API_KEY>"
      }
    }
  }
}

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

once in other clients

once MCP server