Google Sheets MCP Server

# Project Task List ## Project Overview Claude Desktop Extension for Google Sheets access via MCP (Model Context Protocol) ## Completed Tasks ✅ ### Documentation - [x] Create comprehensive README.md - [x] Create detailed ARCHITECTURE.md - [x] Create project task tracking (this file) - [x] Create detailed SETUP.md with Google Service Account instructions - [x] Update documentation for JSON file credentials support - [x] Add credentials testing utility and documentation - [x] Update documentation for XLSX download functionality ### Core Infrastructure - [x] Set up Node.js project structure with proper package.json - [x] Install and configure dependencies (MCP SDK, google-spreadsheet, etc.) - [x] Create proper DXT manifest.json following specification - [x] Implement MCP server with stdio transport - [x] Create Google Sheets service with service account authentication - [x] Implement logging system - [x] Add proper error handling and timeout management - [x] Create basic test framework - [x] Add .gitignore for security and build artifacts - [x] Add JSON file credentials loading support - [x] Create credentials testing utility ### Google Sheets Integration - [x] Implement Google Sheets API client using node-google-spreadsheet - [x] Create XLSX download functionality using doc.downloadAsXLSX() - [x] Implement get_spreadsheet_by_id tool - [x] Implement get_spreadsheet_by_url tool - [x] Add URL parsing functionality to extract sheet IDs - [x] Create XLSX functionality test suite - [x] Update manifest.json for new tools - [x] Remove old search and get_googlesheet tools - [x] **Fix Claude data understanding: Convert tools to return structured JSON data instead of binary XLSX** - [x] **Improve large spreadsheet handling: Split into summary and sheet-specific tools for better navigation** - [x] **Update data structure to 2D array format with enhanced type detection and formatting support** ## In Progress 🚧 ### Phase 2: Testing & Quality Assurance - [x] **Updated data structure to 2D array format with position-based cells** - [ ] Test new 2D structure functionality with real Google Sheets - [ ] Verify URL parsing with various Google Sheets URL formats - [ ] Test error handling for invalid IDs and URLs - [ ] Performance testing of data retrieval ## Upcoming Tasks 📋 ### Phase 1: Core Infrastructure - [x] Set up Node.js project structure - [x] Install and configure dependencies - [x] Create basic MCP server skeleton - [x] Implement MCP protocol handlers - [x] Set up environment configuration ### Phase 2: Authentication - [x] Implement service account authentication - [x] Create Google Cloud project setup guide - [x] Implement authentication error handling - [x] Add JSON file credentials support - [x] Create credentials testing utility - [x] Test authentication flow end-to-end ### Phase 3: Google Sheets Integration - [x] Implement Google Sheets API client - [x] Create XLSX download functionality - [x] Implement get_spreadsheet_by_id tool - [x] Implement get_spreadsheet_by_url tool - [x] Add URL parsing functionality - [x] Create XLSX functionality test suite - [ ] Add rate limiting and error handling for API calls - [ ] Implement proper Google Drive API search functionality (future enhancement) ### Phase 4: Testing & Quality Assurance - [x] Write XLSX functionality tests - [ ] Write unit tests for core functionality - [ ] Write integration tests for MCP protocol - [ ] Test with Claude Desktop integration - [ ] Performance testing and optimization - [ ] Security audit and review ### Phase 5: Documentation & Deployment - [x] Update user documentation for XLSX functionality - [ ] Create user installation guide - [ ] Write developer contribution guidelines - [ ] Create troubleshooting guide - [ ] Prepare for initial release - [ ] Set up CI/CD pipeline ## Technical Debt & Improvements 🔧 ### Code Quality - [ ] Add ESLint configuration - [ ] Add Prettier formatting - [ ] Implement TypeScript (future consideration) - [x] Add comprehensive logging (fixed stdout/stderr issue) - [x] Implement proper error handling ### Security Enhancements - [ ] Security audit of dependencies - [ ] Implement input validation - [ ] Add rate limiting protection - [ ] Secure token storage review - [ ] Privacy compliance review ### Performance Optimizations - [ ] Implement connection pooling - [ ] Add intelligent caching - [ ] Optimize memory usage - [ ] Add performance monitoring - [ ] Implement request batching ## Future Enhancements 🚀 ### Advanced Features - [ ] Write access to Google Sheets - [ ] Batch operations support - [ ] Real-time updates via webhooks - [ ] Advanced search capabilities - [ ] Data visualization support - [ ] Support for other export formats (CSV, PDF) ### Integration Enhancements - [ ] Support for Google Drive files - [ ] Integration with other Google services - [ ] Multi-account support - [ ] Offline mode support - [ ] Mobile device support ## Blockers & Dependencies 🚫 ### External Dependencies - [ ] Google Cloud Console access - [ ] OAuth2 credentials setup - [ ] Claude Desktop extension API documentation - [ ] MCP protocol specification compliance ### Technical Dependencies - [ ] Node.js 18+ runtime - [ ] Google APIs Node.js client library - [ ] MCP protocol implementation - [ ] OAuth2 library selection ## Notes & Decisions 📝 ### Architecture Decisions - **Language**: Node.js for MCP server implementation - **Authentication**: Service account authentication for reliability - **Data Format**: XLSX format for sheet retrieval using doc.downloadAsXLSX() - **Storage**: No persistent storage of sensitive data - **Scope**: Read-only access initially - **Tools**: Two focused tools - get_spreadsheet_summary (metadata only) and get_spreadsheet_sheet_data (specific sheet data) ### Design Principles Applied - [SF] Simplicity First: Two focused tools instead of complex search functionality - [SFT] Security First: Service account authentication, HTTPS, minimal scopes - [REH] Robust Error Handling: Comprehensive error management with URL parsing - [DM] Dependency Minimalism: Using node-google-spreadsheet library for XLSX functionality - [RP] Readability Priority: Clear method names and comprehensive documentation ### Recent Changes - **Replaced search functionality** with direct XLSX download tools - **Added URL parsing** to support various Google Sheets URL formats - **Implemented doc.downloadAsXLSX()** for reliable XLSX generation - **Updated documentation** to reflect new functionality - **Created test suite** for XLSX functionality - **Split tools for large spreadsheet navigation**: Created `get_spreadsheet_summary` and `get_spreadsheet_sheet_data` tools for efficient handling of large spreadsheets with many sheets - **Updated to 2D array structure**: Changed cell data format from object keyed by address to array with position-based cells, including automatic type detection (string, number, currency, percentage, date, boolean) and separate raw values from formatted display values ## Progress Tracking ### Week 1 Goals - [x] Complete project setup - [x] Implement basic MCP server - [x] Set up authentication infrastructure ### Week 2 Goals - [x] Complete Google Sheets integration - [x] Implement XLSX download tools - [x] Basic testing framework ### Week 3 Goals - [ ] Comprehensive testing - [x] Documentation completion - [ ] Initial release preparation ## Success Metrics 📊 ### Technical Metrics - [ ] 100% test coverage for core functionality - [ ] < 2 second response time for API calls - [ ] Zero security vulnerabilities - [ ] 99.9% uptime for MCP server - [x] Successful XLSX download functionality ### User Experience Metrics - [x] Successful authentication flow - [x] Reliable XLSX file generation - [x] Accurate URL parsing - [x] Clear error messages ### Development Metrics - [ ] Code review completion - [x] Documentation completeness - [ ] Deployment automation - [ ] Monitoring implementation --- **Last Updated**: After implementing XLSX download functionality **Next Review**: After comprehensive testing **Project Status**: Implementation Phase - XLSX functionality complete