A Model Context Protocol (MCP) server for Google BigQuery that enables AI agents to interact with BigQuery databases through natural language queries and schema exploration.
This project was developed by Snow Leopard AI as a benchmarking tool for our platform, and we're making it publicly available for the community to use and build upon.
What is MCP?
The Model Context Protocol (MCP) is an open standard that allows AI applications to securely connect to external data sources and tools. This BigQuery MCP server acts as a bridge between AI agents and your BigQuery datasets.
Snow Leopard BigQuery MCP Server Features
Resources
Tools
Quick Start: Claude Desktop
Prerequisites
Before getting started, ensure you have:
- Claude Desktop: Download here
- Google Cloud Project with BigQuery enabled: Setup guide
- Google Cloud CLI (gcloud): Installation guide
- UV Package Manager: Installation guide
1. Setup Google Cloud
First, we need to authenticate with Google.
gcloud auth application-default login
This opens your browser to authenticate your local machine with Google Cloud.
2. Configure Claude Desktop
Edit your claude_desktop_config.json file to add the BigQuery MCP server.
Application: Claude > Settings > Developer > Edit Config
Mac: ~/Library/Application\ Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\\Claude\\claude_desktop_config.json
You will need to set your project to a Google Cloud project with permissions to submit bigquery jobs. If you do not have a project that you can run bigquery jobs on, create and test one by following Google's BigQuery Quickstart Guide Create a project and follow the instructions to query a public dataset.
{
"mcpServers": {
"bigquery": {
"command": "uvx",
"args": [
"sl-bigquery-mcp",
"--dataset",
"bigquery-public-data.usa_names",
"--project",
"🚨 <projectName> 🚨"
]
}
}
}
3. Close Claude Desktop and Launch it from the terminal
Depending on how you have installed uv, the uvx executable may not be in Claude Desktop's PATH if it is launched from the GUI. To be sure uvx is accessible from Claude Desktop, let's run it in the terminal.
open -a claude
After saving the configuration, restart Claude Desktop. You should now be able to ask Claude questions about your BigQuery data!
Example Query
What are the top 10 most popular names in 2020?
Configuration Options
To see a complete list of parameters:
uvx sl-bigquery-mcp --help
Usage: sl-bigquery-mcp [OPTIONS]
╭─ Options ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ --mode [stdio|sse|streamable-http] MCP transport protocol [default: stdio] │
│ --dataset TEXT Dataset(s) for mcp resources. Will create resources for all tables. │
│ --table TEXT Table(s) for mcp resources. Can be specified as project.dataset.table or dataset.table │
│ --enable-list-tables-tool --no-enable-list-tables-tool Registers list_resources tool [default: enable-list-tables-tool] │
│ --enable-schema-tool --no-enable-schema-tool Registers get_schema tool [default: enable-schema-tool] │
│ --project TEXT BigQuery project [env var: BQ_PROJECT] [default: None] │
│ --api-method [INSERT|QUERY] BigQuery client api_method [default: QUERY] │
│ --port INTEGER [default: 8000] │
╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
Troubleshooting / FAQ
An MCP Error has occurred
First, check out your Claude Desktop app logs (in the same directory as the config file) for more verbose errors / logging
On Startup
This usually means Claude is having issues starting the mcp server. Frequently this is due to uvx being inaccessible from
the application. In this case, use the full path to your uvx executable instead of just uvx in claude_desktop_config.json.
To find your uv executable, run
which uvx
Otherwise, this may be caused by bad arguments, dependency version incompatibilities, or bugs. If you run into the last two, please file an issue describing the problem.
On Resource / Tool Usage
This may be a misconfiguration mcp server, authentication issues, the llm getting too much data, or of course, product bugs. After checking the logs, consider using the MCP Inspector to debug your issue. And of course, file any bugs you find on our issue board.
Local Development & Testing
Setup Development Environment
- Clone the repository
- Setup virtual environment and install dependencies
- Verify installation
git clone https://github.com/SnowLeopard-AI/bigquery-mcp.git
cd bigquery-mcp
uv sync
source .venv/bin/activate
sl-bigquery-mcp --help
Authenticate with Google Cloud
The following command will launch a browser for you to login to your google cloud account. You must have a Google Cloud
project with BigQuery enabled. If you don't, see Google's bigquery setup guide.
gcloud auth application-default login
gcloud config set project <projectName>
gcloud auth application-default set-quota-project <projectName>
Running Tests
Run the tests to make sure your dev environment is properly configured.
pytest tests
Note: the tests run actual BigQuery queries against public datasets and require authentication.
Local MCP Inspector
For hands-on testing and development, use the MCP Inspector tool:
npx @modelcontextprotocol/inspector uv run sl-bigquery-mcp --dataset bigquery-public-data.usa_names
Contributing
We welcome contributions! Please coordinate with us on discord to ensure your changes can quicly make it into the repo. Communicating before coding always saves time.
For logistics of contributing to an open source project, see the first contributions repository.
Support
Issues: GitHub Issues
Documentation: BigQuery Documentation
MCP Protocol: Model Context Protocol
Contact: Discord Server