DollhouseMCP

# QA Analytics Report *Generated on August 22, 2025* ## Executive Summary Analysis of 4 QA test runs reveals a system with **inconsistent reliability patterns**. While the latest comprehensive test shows 94% success rate (15/16 tests), earlier runs demonstrate concerning failure modes that require immediate attention to achieve 100% reliability. **Key Findings:** - **Current State**: 94% success rate in most comprehensive test - **Critical Issue**: `browse_collection` tool shows timeout failures in earlier runs - **Performance**: Excellent with sub-millisecond response times for most operations - **Memory**: Stable with consistent 73-82MB RSS usage - **Tool Availability**: All 41 tools consistently available **Priority Actions Required:** 1. Fix `browse_collection` timeout issues 2. Improve error handling for element activation with invalid names 3. Optimize tool discovery performance (varies 6-207ms) 4. Implement retry mechanisms for network-dependent operations --- ## Tool-by-Tool Success Analysis ### High Reliability Tools (100% Success Rate) - **`direct_connection`**: 3/3 successful (95-102ms avg) - **`tools_availability`**: 3/3 successful (202-207ms avg) - **`list_elements`**: 7/7 successful (1-120ms range) - **`get_user_identity`**: 2/2 successful (<1ms) - **`set_user_identity`**: 1/1 successful (<1ms) - **`get_active_elements`**: 2/2 successful (<1ms) - **`deactivate_element`**: 1/1 successful (<1ms) - **`search_collection`**: 1/1 successful (49ms) ### Problematic Tools Requiring Attention #### 1. `browse_collection` (67% Success Rate) - **Failures**: 1 timeout failure out of 3 total executions - **Performance**: Highly variable (6ms to 300ms) - **Root Cause**: Network timeouts in Run #1 (300ms timeout) - **Status**: Improved in later runs (6-154ms in Run #4) #### 2. `activate_element` (67% Success Rate) - **Failures**: 1 failure out of 3 total executions - **Root Cause**: Attempting to activate non-existent element "NonExistentElement" - **Error**: "MCP error -32602: Persona not found: NonExistentElement" - **Performance**: Excellent when successful (<1ms) #### 3. `invalid_tool` (Skipped) - **Status**: Correctly skipped as expected - **Performance**: 10ms detection time --- ## Performance Metrics Breakdown ### Response Time Analysis | Metric | Run #1 | Run #2 | Run #3 | Run #4 | Trend | |--------|--------|--------|--------|--------|-------| | **Total Duration** | 153ms | 297ms | 310ms | 453ms | 📈 Increasing | | **Tool Discovery** | 50ms | 202ms | 207ms | 6ms | ⚡ Highly Variable | | **Server Startup** | 100ms | 0ms | 0ms | 0ms | ✅ Optimized | | **P95 Response** | 300ms | 202ms | 207ms | 154ms | ✅ Improving | | **Average Response** | 133ms | 149ms | 155ms | 15ms | ⚡ Variable | ### Performance Insights - **Tool Discovery**: Extremely variable (6-207ms) - needs investigation - **Server Startup**: One-time 100ms cost, then optimized to 0ms - **Individual Operations**: Most tools respond in <50ms - **P95 Performance**: Trending downward (improving) from 300ms to 154ms --- ## Memory Usage Analysis ### Memory Consumption Patterns | Metric | Run #1 | Run #2 | Run #3 | Run #4 | Status | |--------|--------|--------|--------|--------|---------| | **Peak RSS** | 46.5MB | 81.3MB | 82.1MB | 79.5MB | ✅ Stable | | **Min RSS** | 46.2MB | 73.6MB | 72.5MB | 73.8MB | ✅ Consistent | | **Peak Heap** | 5.4MB | 14.0MB | 14.0MB | 14.4MB | ✅ Stable | | **Heap Growth** | 0.1MB | 0.5MB | 0.8MB | 1.0MB | ⚠️ Gradual Growth | ### Memory Health Assessment - **RSS Usage**: Stable in 73-82MB range after initialization - **Heap Growth**: Minimal growth during test execution (0.5-1.0MB) - **Memory Efficiency**: No evidence of memory leaks - **External Memory**: Consistent ~3.8-4.0MB usage --- ## Failure Patterns and Root Causes ### Pattern 1: Network-Related Timeouts - **Tool**: `browse_collection` - **Frequency**: 33% failure rate - **Root Cause**: Network latency or collection service unavailability - **Solution**: Implement retry logic with exponential backoff ### Pattern 2: Invalid Input Handling - **Tool**: `activate_element` - **Frequency**: 33% failure rate - **Root Cause**: Attempting to activate non-existent elements - **Current Behavior**: Proper error reporting with MCP error codes - **Improvement**: Consider fuzzy matching for element names ### Pattern 3: Tool Discovery Variability - **Scope**: Affects overall test initialization - **Variability**: 6-207ms range - **Impact**: Increases total test duration unpredictably - **Solution**: Cache tool discovery results where appropriate --- ## Success Rate Trends Over Time ### Test Run Progression 1. **Run #1** (15:21:59): 75% success (3/4 successful, 1 skipped) 2. **Run #2** (15:26:49): 100% success (2/2 successful) 3. **Run #3** (15:48:53): 100% success (2/2 successful) 4. **Run #4** (15:49:17): 94% success (15/16 successful) ### Reliability Assessment - **Best Performance**: 100% in simplified test suites - **Comprehensive Testing**: 94% success rate reveals edge cases - **Trend**: System performs better with focused test scopes - **Stability**: Core functionality (connection, tools) highly reliable --- ## Specific Recommendations for 100% Success Rate ### Priority 1: Fix `browse_collection` Timeout Issues **Problem**: 300ms timeout failure in comprehensive testing - **Action**: Implement timeout configuration (default: 5000ms) - **Fallback**: Return cached results when service unavailable - **Monitoring**: Add collection service health checks - **Timeline**: Immediate (blocks 100% success rate) ### Priority 2: Enhance Element Validation **Problem**: `activate_element` fails on non-existent elements - **Action**: Pre-validate element existence before activation - **Enhancement**: Implement fuzzy matching for element names - **UX**: Provide "did you mean?" suggestions for typos - **Timeline**: 2-3 days ### Priority 3: Optimize Tool Discovery Performance **Problem**: Highly variable discovery times (6-207ms) - **Action**: Cache tool schema after first discovery - **Optimization**: Lazy load non-critical tool metadata - **Monitoring**: Add discovery performance metrics - **Timeline**: 1 week ### Priority 4: Implement Comprehensive Retry Logic **Problem**: Network-dependent operations lack resilience - **Action**: Add configurable retry logic with exponential backoff - **Scope**: `browse_collection`, `search_collection`, external calls - **Configuration**: Max 3 retries, 100ms initial delay - **Timeline**: 3-5 days ### Priority 5: Enhanced Error Recovery **Problem**: Limited recovery from transient failures - **Action**: Implement graceful degradation for non-critical features - **Fallback**: Return empty results instead of hard failures where appropriate - **Logging**: Enhanced error context for debugging - **Timeline**: 1 week --- ## Performance Optimization Opportunities ### Immediate Improvements (0-2 days) 1. **Cache Tool Discovery**: Reduce 207ms → 6ms consistently 2. **Timeout Configuration**: Prevent browse_collection timeouts 3. **Connection Pooling**: Optimize repeated collection access ### Short-term Improvements (1 week) 1. **Async Tool Loading**: Parallel tool initialization 2. **Response Compression**: Reduce network overhead 3. **Smart Caching**: Cache collection browse results ### Long-term Improvements (2+ weeks) 1. **Predictive Preloading**: Anticipate commonly used tools 2. **Performance Profiling**: Continuous performance monitoring 3. **Load Balancing**: Distribute collection service load --- ## Quality Assurance Recommendations ### Testing Strategy Enhancements 1. **Stress Testing**: Run tests under various load conditions 2. **Network Simulation**: Test with simulated network latency/failures 3. **Edge Case Coverage**: Expand tests for boundary conditions 4. **Regression Prevention**: Add tests for each fixed issue ### Monitoring and Alerting 1. **Real-time Dashboards**: Track success rates in production 2. **Performance Alerts**: Alert on >200ms response times 3. **Reliability Targets**: Set SLA of 99.5% success rate 4. **Trend Analysis**: Weekly performance review meetings ### Development Workflow 1. **Pre-commit Testing**: Run QA suite before each commit 2. **Performance Budgets**: Reject changes that degrade performance >10% 3. **Error Budget**: Allow 0.5% failure rate for feature development 4. **Documentation**: Update this report weekly with new insights --- ## Conclusion The MCP server demonstrates **strong foundational reliability** with excellent performance characteristics. The path to 100% success rate is clear and achievable through focused improvements in timeout handling, input validation, and performance optimization. **Current State**: 94% success rate with stable memory usage and good performance **Target State**: 100% success rate with <100ms P95 response times **Timeline**: 2-3 weeks for complete implementation of all recommendations **Confidence**: High - all identified issues have clear, implementable solutions The system shows consistent improvement trends and has all the architectural foundations necessary for enterprise-grade reliability.