Clickhouse MCP server

A Clickhouse database MCP server project.

Components

Tools

The server provides two tools:

• connect_database: Connects to a specific Clickhouse database

  • database parameter: Name of the database to connect to (string)
  • Returns a confirmation message when connection is successful

• execute_query: Executes Clickhouse queries

  • query parameter: SQL query/queries to execute (string)
  • Returns query results in JSON format
  • Multiple queries can be sent separated by semicolons

Development

Building and Publishing

To prepare the package for distribution:

1. Sync dependencies and update lockfile:

uv sync

2. Build package distributions:

uv build

This will create source and wheel distributions in the dist/ directory.

3. Publish to PyPI:

uv publish

Note: You'll need to set PyPI credentials via environment variables or command flags:

• Token: --token or UV_PUBLISH_TOKEN
• Or username/password: --username/UV_PUBLISH_USERNAME and --password/UV_PUBLISH_PASSWORD

Debugging

Since MCP servers run over stdio, debugging can be challenging. For the best debugging experience, we strongly recommend using the MCP Inspector.

You can launch the MCP Inspector via npm with this command:

npx @modelcontextprotocol/inspector uv --directory /Users/burakdirin/Projects/clickhouse-mcp-server run clickhouse-mcp-server

Upon launching, the Inspector will display a URL that you can access in your browser to begin debugging.

Installation

You can install the package using uv:

uv pip install clickhouse-mcp-server

Or using pip:

pip install clickhouse-mcp-server

Configuration

The server uses the following environment variables:

• CLICKHOUSE_HOST: Clickhouse server address (default: "localhost")
• CLICKHOUSE_USER: Clickhouse username (default: "root")
• CLICKHOUSE_PASSWORD: Clickhouse password (default: "")
• CLICKHOUSE_DATABASE: Initial database (optional)
• CLICKHOUSE_READONLY: Read-only mode (set to 1/true to enable, default: false)

Quickstart

Installation

Claude Desktop

MacOS: ~/Library/Application\ Support/Claude/claude_desktop_config.json

Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "clickhouse-mcp-server": {
      "command": "uv",
      "args": [
        "--directory",
        "/Users/burakdirin/Projects/clickhouse-mcp-server",
        "run",
        "clickhouse-mcp-server"
      ],
      "env": {
        "CLICKHOUSE_HOST": "localhost",
        "CLICKHOUSE_USER": "root",
        "CLICKHOUSE_PASSWORD": "password",
        "CLICKHOUSE_DATABASE": "[optional]",
        "CLICKHOUSE_READONLY": "true"
      }
    }
  }
}

{
  "mcpServers": {
    "clickhouse-mcp-server": {
      "command": "uvx",
      "args": [
        "clickhouse-mcp-server"
      ],
      "env": {
        "CLICKHOUSE_HOST": "localhost",
        "CLICKHOUSE_USER": "root",
        "CLICKHOUSE_PASSWORD": "password",
        "CLICKHOUSE_DATABASE": "[optional]",
        "CLICKHOUSE_READONLY": "true"
      }
    }
  }
}

Installing via Smithery

To install Clickhouse Database Integration Server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @burakdirin/clickhouse-mcp-server --client claude