Grain MCP Server

io.github.pattrnlabs/grain

Repository Registry

What is the Grain MCP server?

Run SQL queries and inspect database schemas through safe, visible MCP tools.

How to install Grain

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

GRAIN_CONNECTIONS
secret
JSON array of Grain connection profiles for headless use.
GRAIN_MCP_SAFE_MODE
Set to false to allow mutating SQL. Defaults to true.
GRAIN_MAX_ROWS
Maximum rows returned by query tools. Defaults to 10000.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "grain": {
      "command": "npx",
      "args": [
        "-y",
        "grain-tools",
        "-y",
        "--stdio"
      ],
      "env": {
        "GRAIN_CONNECTIONS": "<YOUR_GRAIN_CONNECTIONS>",
        "GRAIN_MCP_SAFE_MODE": "<YOUR_GRAIN_MCP_SAFE_MODE>",
        "GRAIN_MAX_ROWS": "<YOUR_GRAIN_MAX_ROWS>"
      }
    }
  }
}

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