BigQuery MCP Server

What is this? 🤔

This is a server that lets your LLMs (like Claude) talk directly to your BigQuery data! Think of it as a friendly translator that sits between your AI assistant and your database, making sure they can chat securely and efficiently.

Quick Example

No more writing SQL queries by hand - just chat naturally with your data!

How Does It Work? 🛠️

This server uses the Model Context Protocol (MCP), which is like a universal translator for AI-database communication. While MCP is designed to work with any AI model, right now it's available as a developer preview in Claude Desktop.

Here's all you need to do:

1. Set up authentication (see below)
2. Add your project details to Claude Desktop's config file
3. Start chatting with your BigQuery data naturally!

What Can It Do? 📊

• Run SQL queries by just asking questions in plain English
• Access both tables and materialized views in your datasets
• Explore dataset schemas with clear labeling of resource types (tables vs views)
• Analyze data within safe limits (1GB query limit by default)
• Keep your data secure (read-only access)

Quick Start 🚀

Prerequisites

• Node.js 14 or higher
• Google Cloud project with BigQuery enabled
• Either Google Cloud CLI installed or a service account key file
• Claude Desktop (currently the only supported LLM interface)

Option 1: Quick Install via Smithery (Recommended)

To install BigQuery MCP Server for Claude Desktop automatically via Smithery, run this command in your terminal:

The installer will prompt you for:

• Your Google Cloud project ID
• BigQuery location (defaults to us-central1)

Once configured, Smithery will automatically update your Claude Desktop configuration and restart the application.

Option 2: Manual Setup

If you prefer manual configuration or need more control:

1. Authenticate with Google Cloud (choose one method):
   • Using Google Cloud CLI (great for development):
     gcloud auth application-default login
   • Using a service account (recommended for production):
     # Save your service account key file and use --key-file parameter # Remember to keep your service account key file secure and never commit it to version control
2. Add to your Claude Desktop config Add this to your claude_desktop_config.json:
   • Basic configuration:
     { "mcpServers": { "bigquery": { "command": "npx", "args": [ "-y", "@ergut/mcp-bigquery-server", "--project-id", "your-project-id", "--location", "us-central1" ] } } }
   • With service account:
     { "mcpServers": { "bigquery": { "command": "npx", "args": [ "-y", "@ergut/mcp-bigquery-server", "--project-id", "your-project-id", "--location", "us-central1", "--key-file", "/path/to/service-account-key.json" ] } } }
3. Start chatting! Open Claude Desktop and start asking questions about your data.

Command Line Arguments

The server accepts the following arguments:

• --project-id: (Required) Your Google Cloud project ID
• --location: (Optional) BigQuery location, defaults to 'us-central1'
• --key-file: (Optional) Path to service account key JSON file

Example using service account:

Permissions Needed

You'll need one of these:

• roles/bigquery.user (recommended)
• OR both:
  • roles/bigquery.dataViewer
  • roles/bigquery.jobUser

Developer Setup (Optional) 🔧

Want to customize or contribute? Here's how to set it up locally:

Then update your Claude Desktop config to point to your local build:

Current Limitations ⚠️

• MCP support is currently only available in Claude Desktop (developer preview)
• Connections are limited to local MCP servers running on the same machine
• Queries are read-only with a 1GB processing limit
• While both tables and views are supported, some complex view types might have limitations

Support & Resources 💬

• 🐛 Report issues
• 💡 Feature requests
• 📖 Documentation

License 📝

MIT License - See LICENSE file for details.

Author ✍️

Salih Ergüt

Version History 📋

See CHANGELOG.md for updates and version history.