SQLx MCP Server

# SQLx MCP Server v1.1.9 - Smart Configuration Management Update ## 🎯 Key Features Added ### 1. Auto-Configuration Detection & Client Notification The server now automatically detects and reports database configuration status to clients during MCP initialization: - **Configuration Source Detection**: Identifies whether database is configured via command line, environment variable, or not configured - **Client Notification**: Sends configuration status via MCP protocol `initialize` response - **Usage Guidance**: Informs clients whether `database_url` parameter is required in tool calls ### 2. Secure Configuration Display - **Credential Masking**: Database passwords automatically replaced with `***` in all displays - **Safe Logging**: Configuration information logged safely without exposing sensitive data - **URL Parsing**: Robust URL parsing with fallback for malformed URLs ### 3. Enhanced Tool Flexibility - **Optional Parameters**: All tool `database_url` parameters now truly optional when server is pre-configured - **Fallback Strategy**: Tools automatically use server configuration when no URL provided - **Override Capability**: Clients can still override server configuration per tool call ## 🔧 Technical Implementation ### Code Changes 1. **src/main.rs**: - Added `mask_database_url()` method for secure URL display - Enhanced `get_info()` method to include configuration status - Added startup logging of database configuration - Updated tool parameter descriptions 2. **Database Configuration Priority**: ``` Tool Parameter > Command Line > Environment Variable > Error ``` ### MCP Protocol Integration The server now sends configuration information in the `initialize` response: ```json { "instructions": "Current database configuration: Database configured via environment variable: postgresql://user:***@localhost:5432/mydb\n\nIf a database is already configured, you can omit the database_url parameter in tool calls." } ``` ## 📋 Client Experience Improvements ### Before This Update - Clients had to provide `database_url` for every tool call - No visibility into server's database configuration - Unclear when parameters were optional ### After This Update - Clients automatically notified of server configuration status - Clear guidance on when `database_url` parameter is needed - Flexible usage patterns supported ## 🔒 Security Enhancements - **Credential Protection**: All database passwords masked with `***` - **Secure Logging**: Configuration logged without exposing sensitive information - **URL Validation**: Robust parsing prevents information leakage from malformed URLs ## 📚 Documentation Updates - **README.md**: Comprehensive updates covering new configuration features - **DATABASE_CONFIG_VERIFICATION.md**: Detailed verification and testing documentation - **Usage Examples**: Updated all tool examples to show optional parameters ## 🧪 Testing & Validation Verified functionality across different configuration scenarios: 1. ✅ No database configuration (requires `database_url` in tool calls) 2. ✅ Environment variable configuration (optional `database_url`) 3. ✅ Command line argument configuration (optional `database_url`) 4. ✅ Credential masking works correctly 5. ✅ Client notification via MCP protocol ## 🚀 Benefits - **Improved UX**: Clearer guidance for client applications - **Enhanced Security**: Credential protection in all contexts - **Greater Flexibility**: Support for multiple usage patterns - **Better Integration**: Seamless MCP protocol compliance ## 📈 Impact This update significantly improves the user experience for MCP clients by providing: - Automatic configuration discovery - Clear usage guidance - Enhanced security - Flexible deployment options The smart configuration management makes the server more professional and user-friendly while maintaining full backward compatibility.