Crashlytics Server

License: MIT Node.js MCP

A clean, simple Model Context Protocol (MCP) server that integrates Firebase Crashlytics with BigQuery for AI-powered crash analysis. Built for use with Claude Code and other MCP-compatible AI assistants.

✨ Features

• 🔍 Simple Tools: Clean, single-responsibility tools for crash analysis
• 📱 App Discovery: Automatically discover all apps in your Firebase project
• 💥 Fatal Crash Analysis: Get detailed fatal crashes with stack traces
• 🐛 ANR Issue Detection: Analyze Application Not Responding issues
• 🔧 Easy Setup: Simple configuration with environment variables
• 🤖 AI-Optimized: Structured output perfect for AI analysis and debugging

🚀 Quick Start

Prerequisites

• Node.js 18+
• Firebase project with Crashlytics enabled
• BigQuery export enabled for Crashlytics
• Google Cloud service account with BigQuery access

Installation

1. Clone the repository:

git clone https://github.com/your-username/mcp-crashlytics-server.git
cd mcp-crashlytics-server

2. Install dependencies:

npm install

3. Build the project:

npm run build

Configuration

1. Create environment file:

cp .env.example .env

2. Configure your environment variables:

# Google Cloud Service Account (choose one method)
GOOGLE_SERVICE_ACCOUNT_KEY=/path/to/your-service-account.json
# OR base64-encoded: GOOGLE_SERVICE_ACCOUNT_KEY=eyJhbGciOiJIUzI1...

# Your Firebase project settings
BIGQUERY_PROJECT_ID=your-firebase-project-id
BIGQUERY_DATASET_ID=firebase_crashlytics

# Optional: Default limit for crash queries
DEFAULT_CRASH_LIMIT=10

Setup Firebase & BigQuery

1. Enable Crashlytics BigQuery Export:

   • Go to Firebase Console → Project Settings → Integrations
   • Enable BigQuery integration for Crashlytics
   • Data will be exported to firebase_crashlytics dataset

2. Create Service Account:

   • Go to Google Cloud Console
   • Navigate to IAM & Admin → Service Accounts
   • Create service account with these roles:
     • BigQuery Data Viewer
     • BigQuery Job User
   • Download JSON key file

Register with AI Agents

Claude Code

# Register the MCP server
claude mcp add crashlytics -- node /path/to/mcp-crashlytics-server/dist/index.js

# Verify it's working
claude mcp list

Cursor

Add to your .cursorrules or cursor settings:

{
  "mcpServers": {
    "crashlytics": {
      "command": "node",
      "args": ["/path/to/mcp-crashlytics-server/dist/index.js"],
      "env": {
        "GOOGLE_SERVICE_ACCOUNT_KEY": "/path/to/your-service-account.json",
        "BIGQUERY_PROJECT_ID": "your-firebase-project-id",
        "BIGQUERY_DATASET_ID": "firebase_crashlytics"
      }
    }
  }
}

Windsurf

Add to your Windsurf settings or .windsurfrules:

{
  "mcp": {
    "servers": {
      "crashlytics": {
        "command": "node",
        "args": ["/path/to/mcp-crashlytics-server/dist/index.js"],
        "env": {
          "GOOGLE_SERVICE_ACCOUNT_KEY": "/path/to/your-service-account.json",
          "BIGQUERY_PROJECT_ID": "your-firebase-project-id", 
          "BIGQUERY_DATASET_ID": "firebase_crashlytics"
        }
      }
    }
  }
}

Other MCP-Compatible IDEs

For other MCP-compatible tools, add this server configuration:

• Command: node
• Args: ["/path/to/mcp-crashlytics-server/dist/index.js"]
• Environment Variables: Same as above (.env file values)

🛠️ Available Tools

1. list_available_apps

Discover all apps in your Firebase Crashlytics dataset.

• Parameters: None
• Returns: List of apps with crash counts

// Usage in Claude Code/Cursor
"What apps are available in my crashlytics data?"

2. get_fatal_crashes

Get fatal crashes for a specific app.

• Parameters:
  • app_package (required): App package name (e.g., "com.example.myapp")
  • limit (optional): Number of crashes (1-50, default: 10)

// Usage in Claude Code/Cursor  
"Get the 10 most recent fatal crashes for com.example.myapp"

3. get_anr_issues

Get ANR (Application Not Responding) issues for a specific app.

• Parameters:
  • app_package (required): App package name
  • limit (optional): Number of issues (1-50, default: 10)

// Usage in Claude Code/Cursor
"Show me ANR issues for com.example.myapp, limit to 5"

📋 Example Usage

Once set up, you can ask Claude Code natural questions like:

# Discover your apps
"What apps do I have crash data for?"

# Get fatal crashes
"Show me the latest fatal crashes for my Android app"
"Get 5 fatal crashes for com.mycompany.myapp"

# Analyze ANR issues  
"What ANR issues does my app have?"
"Show ANR problems for com.mycompany.myapp from the last week"

🏗️ Project Structure

mcp-crashlytics-server/
├── src/
│   ├── index.ts              # Main MCP server
│   ├── bigquery-client.ts    # BigQuery integration  
│   ├── crash-processor.ts    # Crash data processing
│   ├── impact-analyzer.ts    # Impact analysis
│   └── types.ts             # TypeScript definitions
├── dist/                    # Built JavaScript files
├── package.json
├── tsconfig.json
├── .env.example            # Environment template
└── README.md

🔧 Development

Running in Development Mode

npm run dev

Building

npm run build

Linting

npm run lint

Testing

npm test

🐛 Troubleshooting

Common Issues

1. "No MCP servers configured"

• Make sure to register the server: claude mcp add crashlytics -- node /path/to/dist/index.js
• Restart Claude Code/Cursor IDE

2. "Authentication Failed"

• Verify service account JSON file path is correct
• Ensure service account has BigQuery permissions
• Check project ID matches your Firebase project

3. "No crashes returned"

• Confirm Crashlytics BigQuery export is enabled
• Wait 24-48 hours for initial data export
• Verify your app is actually sending crash data

4. "Table not found"

• Check that BIGQUERY_DATASET_ID is correct (usually firebase_crashlytics)
• Ensure crashes exist in your Firebase project
• Verify BigQuery export is working in Firebase Console

Debug Mode

Enable verbose logging:

DEBUG=mcp-crashlytics-server npm start

🤝 Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes
4. Add tests for new functionality
5. Commit your changes (git commit -m 'Add amazing feature')
6. Push to the branch (git push origin feature/amazing-feature)
7. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🔒 Security Considerations

• ⚠️ Never expose service account credentials in logs or version control
• 🔐 Use least-privilege permissions for service accounts
• 🔑 Store credentials securely using environment variables
• 🚫 Add .env to .gitignore (already included)

📚 Resources

• Model Context Protocol Documentation
• Claude Code Documentation
• Firebase Crashlytics
• BigQuery Documentation

💡 Need Help?

• 🐛 Found a bug? Open an issue
• 💬 Have questions? Start a discussion
• 🚀 Want a feature? Request it here

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