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mcp/harbor
Grok

PostgreSQL (hardened, read-only) for Grok

io.github.eszetael/postgres-mcp-hardened

Read-only PostgreSQL over MCP. Writes refused at the parsed SQL, plus a READ ONLY transaction.

client:Grok transport:stdio runtime:npm

Install PostgreSQL (hardened, read-only) 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": {
    "postgres-mcp-hardened": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "postgres-mcp-hardened"
      ],
      "env": {
        "DATABASE_URL": "<DATABASE_URL>",
        "MCP_STATEMENT_TIMEOUT": "<MCP_STATEMENT_TIMEOUT>",
        "MCP_ALLOW_TABLES": "<MCP_ALLOW_TABLES>",
        "MCP_AUDIT_LOG": "<MCP_AUDIT_LOG>"
      }
    }
  }
}

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

PostgreSQL (hardened, read-only) in other clients

PostgreSQL (hardened, read-only) MCP server