diff --git a/.cursor/rules/meta_change_evaluation.mdc b/.cursor/rules/meta_change_evaluation.mdc
new file mode 100644
index 00000000..dd4e1f74
--- /dev/null
+++ b/.cursor/rules/meta_change_evaluation.mdc
@@ -0,0 +1,383 @@
+# Meta-Rule: Change Evaluation and Breaking Change Detection
+
+**Author**: Matthew Raymer  
+**Date**: 2025-08-25  
+**Status**: 🎯 **ACTIVE** - Manually activated change evaluation rule
+
+## Purpose
+
+This meta-rule provides a systematic approach to evaluate changes between
+branches and detect potential breaking changes. It's designed to catch
+problematic model behavior by analyzing the nature, scope, and impact of
+code changes before they cause issues.
+
+## When to Use
+
+**Manual Activation Only** - This rule should be invoked when:
+
+- Reviewing changes before merging branches
+- Investigating unexpected behavior after updates
+- Validating that model-generated changes are safe
+- Analyzing the impact of recent commits
+- Debugging issues that may be caused by recent changes
+
+## Workflow State Enforcement
+
+**This meta-rule enforces current workflow mode constraints:**
+
+### **Current Workflow State**
+
+```json
+{
+  "workflowState": {
+    "currentMode": "diagnosis|fixing|planning|research|documentation",
+    "constraints": {
+      "mode": "read_only|implementation|design_only|investigation|writing_only",
+      "allowed": ["array", "of", "allowed", "actions"],
+      "forbidden": ["array", "of", "forbidden", "actions"]
+    }
+  }
+}
+```
+
+### **Mode-Specific Enforcement**
+
+**Diagnosis Mode (read_only):**
+
+- ❌ **Forbidden**: File modification, code creation, build commands, git
+  commits
+- ✅ **Allowed**: File reading, code analysis, investigation, documentation
+- **Response**: Focus on analysis and documentation, not implementation
+
+**Fixing Mode (implementation):**
+
+- ✅ **Allowed**: File modification, code creation, build commands, testing,
+  git commits
+- ❌ **Forbidden**: None (full implementation mode)
+- **Response**: Proceed with implementation and testing
+
+**Planning Mode (design_only):**
+
+- ❌ **Forbidden**: Implementation, coding, building, deployment
+- ✅ **Allowed**: Analysis, design, estimation, documentation, architecture
+- **Response**: Focus on planning and design, not implementation
+
+**Research Mode (investigation):**
+
+- ❌ **Forbidden**: File modification, implementation, deployment
+- ✅ **Allowed**: Investigation, analysis, research, documentation
+- **Response**: Focus on investigation and analysis
+
+**Documentation Mode (writing_only):**
+
+- ❌ **Forbidden**: Implementation, coding, building, deployment
+- ✅ **Allowed**: Writing, editing, formatting, structuring, reviewing
+- **Response**: Focus on documentation creation and improvement
+
+## Change Evaluation Process
+
+### **Phase 1: Change Discovery and Analysis**
+
+1. **Branch Comparison Analysis**
+
+   - Compare working branch with master/main branch
+   - Identify all changed files and their modification types
+   - Categorize changes by scope and impact
+
+2. **Change Pattern Recognition**
+
+   - Identify common change patterns (refactoring, feature addition, bug
+     fixes)
+   - Detect unusual or suspicious change patterns
+   - Flag changes that deviate from established patterns
+
+3. **Dependency Impact Assessment**
+
+   - Analyze changes to imports, exports, and interfaces
+   - Identify potential breaking changes to public APIs
+   - Assess impact on dependent components and services
+
+### **Phase 2: Breaking Change Detection**
+
+1. **API Contract Analysis**
+
+   - Check for changes to function signatures, method names, class
+     interfaces
+   - Identify removed or renamed public methods/properties
+   - Detect changes to configuration options and constants
+
+2. **Data Structure Changes**
+
+   - Analyze database schema modifications
+   - Check for changes to data models and interfaces
+   - Identify modifications to serialization/deserialization logic
+
+3. **Behavioral Changes**
+
+   - Detect changes to business logic and algorithms
+   - Identify modifications to error handling and validation
+   - Check for changes to user experience and workflows
+
+### **Phase 3: Risk Assessment and Recommendations**
+
+1. **Risk Level Classification**
+
+   - **LOW**: Cosmetic changes, documentation updates, minor refactoring
+   - **MEDIUM**: Internal API changes, configuration modifications,
+     performance improvements
+   - **HIGH**: Public API changes, breaking interface modifications, major
+     architectural changes
+   - **CRITICAL**: Database schema changes, authentication modifications,
+     security-related changes
+
+2. **Impact Analysis**
+
+   - Identify affected user groups and use cases
+   - Assess potential for data loss or corruption
+   - Evaluate impact on system performance and reliability
+
+3. **Mitigation Strategies**
+
+   - Recommend testing approaches for affected areas
+   - Suggest rollback strategies if needed
+   - Identify areas requiring additional validation
+
+## Implementation Guidelines
+
+### **Change Analysis Tools**
+
+1. **Git Diff Analysis**
+
+   ```bash
+   # Compare working branch with master
+   git diff master..HEAD --name-only
+   git diff master..HEAD --stat
+   git log master..HEAD --oneline
+   ```
+
+2. **File Change Categorization**
+
+   - **Core Files**: Application entry points, main services, critical
+     utilities
+   - **Interface Files**: Public APIs, component interfaces, data models
+   - **Configuration Files**: Environment settings, build configurations,
+     deployment scripts
+   - **Test Files**: Unit tests, integration tests, test utilities
+
+3. **Change Impact Mapping**
+
+   - Map changed files to affected functionality
+   - Identify cross-dependencies and ripple effects
+   - Document potential side effects and unintended consequences
+
+### **Breaking Change Detection Patterns**
+
+1. **Function Signature Changes**
+
+   ```typescript
+   // BEFORE
+   function processData(data: string, options?: Options): Result
+   
+   // AFTER - BREAKING CHANGE
+   function processData(data: string, options: Required<Options>): Result
+   ```
+
+2. **Interface Modifications**
+
+   ```typescript
+   // BEFORE
+   interface UserProfile {
+     name: string;
+     email: string;
+   }
+   
+   // AFTER - BREAKING CHANGE
+   interface UserProfile {
+     name: string;
+     email: string;
+     phone: string; // Required new field
+   }
+   ```
+
+3. **Configuration Changes**
+
+   ```typescript
+   // BEFORE
+   const config = {
+     apiUrl: 'https://api.example.com',
+     timeout: 5000
+   };
+   
+   // AFTER - BREAKING CHANGE
+   const config = {
+     apiUrl: 'https://api.example.com',
+     timeout: 5000,
+     retries: 3 // New required configuration
+   };
+   ```
+
+## Output Format
+
+### **Change Evaluation Report**
+
+```markdown
+# Change Evaluation Report
+
+## Executive Summary
+
+- **Risk Level**: [LOW|MEDIUM|HIGH|CRITICAL]
+- **Overall Assessment**: [SAFE|CAUTION|DANGEROUS|CRITICAL]
+- **Recommendation**: [PROCEED|REVIEW|HALT|IMMEDIATE_ROLLBACK]
+
+## Change Analysis
+
+### Files Modified
+
+- **Total Changes**: [X] files
+- **Core Files**: [X] files
+- **Interface Files**: [X] files
+- **Configuration Files**: [X] files
+- **Test Files**: [X] files
+
+### Change Categories
+
+- **Refactoring**: [X] changes
+- **Feature Addition**: [X] changes
+- **Bug Fixes**: [X] changes
+- **Configuration**: [X] changes
+- **Documentation**: [X] changes
+
+## Breaking Change Detection
+
+### API Contract Changes
+
+- **Function Signatures**: [X] modified
+- **Interface Definitions**: [X] modified
+- **Public Methods**: [X] added/removed/modified
+
+### Data Structure Changes
+
+- **Database Schema**: [X] modifications
+- **Data Models**: [X] changes
+- **Serialization**: [X] changes
+
+### Behavioral Changes
+
+- **Business Logic**: [X] modifications
+- **Error Handling**: [X] changes
+- **User Experience**: [X] changes
+
+## Risk Assessment
+
+### Impact Analysis
+
+- **User Groups Affected**: [Description]
+- **Use Cases Impacted**: [Description]
+- **Performance Impact**: [Description]
+- **Reliability Impact**: [Description]
+
+### Dependencies
+
+- **Internal Dependencies**: [List]
+- **External Dependencies**: [List]
+- **Configuration Dependencies**: [List]
+
+## Recommendations
+
+### Testing Requirements
+
+- [ ] Unit tests for modified components
+- [ ] Integration tests for affected workflows
+- [ ] Performance tests for changed algorithms
+- [ ] User acceptance tests for UI changes
+
+### Validation Steps
+
+- [ ] Code review by domain experts
+- [ ] API compatibility testing
+- [ ] Database migration testing
+- [ ] End-to-end workflow testing
+
+### Rollback Strategy
+
+- **Rollback Complexity**: [LOW|MEDIUM|HIGH]
+- **Rollback Time**: [Estimated time]
+- **Data Preservation**: [Strategy description]
+
+## Conclusion
+
+[Summary of findings and final recommendation]
+```
+
+## Usage Examples
+
+### **Example 1: Safe Refactoring**
+
+```bash
+@meta_change_evaluation.mdc analyze changes between feature-branch and master
+```
+
+### **Example 2: Breaking Change Investigation**
+
+```bash
+@meta_change_evaluation.mdc evaluate potential breaking changes in recent commits
+```
+
+### **Example 3: Pre-Merge Validation**
+
+```bash
+@meta_change_evaluation.mdc validate changes before merging feature-branch to master
+```
+
+## Success Criteria
+
+- [ ] **Change Discovery**: All modified files are identified and categorized
+- [ ] **Pattern Recognition**: Unusual change patterns are detected and flagged
+- [ ] **Breaking Change Detection**: All potential breaking changes are identified
+- [ ] **Risk Assessment**: Accurate risk levels are assigned with justification
+- [ ] **Recommendations**: Actionable recommendations are provided
+- [ ] **Documentation**: Complete change evaluation report is generated
+
+## Common Pitfalls
+
+- **Missing Dependencies**: Failing to identify all affected components
+- **Underestimating Impact**: Not considering ripple effects of changes
+- **Incomplete Testing**: Missing critical test scenarios for changes
+- **Configuration Blindness**: Overlooking configuration file changes
+- **Interface Assumptions**: Assuming internal changes won't affect external
+  users
+
+## Integration with Other Meta-Rules
+
+### **With Bug Diagnosis**
+
+- Use change evaluation to identify recent changes that may have caused
+  bugs
+- Correlate change patterns with reported issues
+
+### **With Feature Planning**
+
+- Evaluate the impact of planned changes before implementation
+- Identify potential breaking changes early in the planning process
+
+### **With Bug Fixing**
+
+- Validate that fixes don't introduce new breaking changes
+- Ensure fixes maintain backward compatibility
+
+---
+
+**See also**:
+
+- `.cursor/rules/meta_core_always_on.mdc` for core always-on rules
+- `.cursor/rules/meta_feature_planning.mdc` for feature development
+  workflows
+- `.cursor/rules/meta_bug_diagnosis.mdc` for bug investigation workflows
+- `.cursor/rules/meta_bug_fixing.mdc` for fix implementation workflows
+
+**Status**: Active change evaluation meta-rule
+**Priority**: High (applies to all change evaluation tasks)
+**Estimated Effort**: Ongoing reference
+**Dependencies**: All bundled sub-rules
+**Stakeholders**: Development team, Quality Assurance team, Release
+Management team