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.cursor/rules/development/realistic_time_estimation.mdc

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+# Realistic Time Estimation — Development Guidelines
+
+> **Agent role**: **DO NOT MAKE TIME ESTIMATES**. Instead, use phases,
+> milestones, and complexity levels. Time estimates are consistently wrong
+> and create unrealistic expectations.
+
+## Purpose
+
+Development time estimates are consistently wrong and create unrealistic
+expectations. This rule ensures we focus on phases, milestones, and
+complexity rather than trying to predict specific timeframes.
+
+## Critical Rule
+
+**NEVER provide specific time estimates** (hours, days, weeks) for
+development tasks. Instead, use:
+
+- **Complexity levels** (Low, Medium, High, Critical)
+
+- **Phases and milestones** with clear acceptance criteria
+
+- **Platform-specific considerations** (Web, Mobile, Desktop)
+
+- **Testing requirements** and validation steps
+
+## Planning Framework
+
+### Complexity Assessment
+
+- **Low**: Simple changes, existing patterns, minimal testing
+
+- **Medium**: New features, moderate testing, some integration
+
+- **High**: Complex features, extensive testing, multiple platforms
+
+- **Critical**: Core architecture changes, full regression testing
+
+### Platform Categories
+
+- **Web**: Browser compatibility, responsive design, accessibility
+
+- **Mobile**: Native APIs, platform-specific testing, deployment
+
+- **Desktop**: Electron integration, system APIs, distribution
+
+### Testing Strategy
+
+- **Unit tests**: Core functionality validation
+
+- **Integration tests**: Component interaction testing
+
+- **E2E tests**: User workflow validation
+
+- **Platform tests**: Cross-platform compatibility
+
+## Process Guidelines
+
+### Planning Phase
+
+1. **Scope Definition**: Clear requirements and acceptance criteria
+
+2. **Complexity Assessment**: Evaluate technical and business complexity
+
+3. **Phase Breakdown**: Divide into logical, testable phases
+
+4. **Milestone Definition**: Define success criteria for each phase
+
+### Execution Phase
+
+1. **Phase 1**: Foundation and core implementation
+
+2. **Phase 2**: Feature completion and integration
+
+3. **Phase 3**: Testing, refinement, and documentation
+
+4. **Phase 4**: Deployment and validation
+
+### Validation Phase
+
+1. **Acceptance Testing**: Verify against defined criteria
+
+2. **Platform Testing**: Validate across target platforms
+
+3. **Performance Testing**: Ensure performance requirements met
+
+4. **Documentation**: Update relevant documentation
+
+## Remember
+
+**Your first estimate is wrong. Your second estimate is probably still
+wrong. Focus on progress, not deadlines.**
+
+---
+
+**See also**:
+
+- `.cursor/rules/development/planning_examples.mdc` for detailed planning examples
+
+- `.cursor/rules/development/complexity_assessment.mdc` for complexity evaluation
+
+**Status**: Active development guidelines
+**Priority**: High
+**Estimated Effort**: Ongoing reference
+**Dependencies**: None
+**Stakeholders**: Development team, Project managers
+
+## Model Implementation Checklist
+
+### Before Time Estimation
+
+- [ ] **Requirements Analysis**: Understand all requirements and acceptance criteria
+- [ ] **Complexity Assessment**: Evaluate technical and business complexity
+- [ ] **Platform Review**: Identify requirements across all target platforms
+- [ ] **Stakeholder Input**: Gather input from all affected parties
+
+### During Time Estimation
+
+- [ ] **Phase Breakdown**: Divide work into logical, testable phases
+- [ ] **Complexity Classification**: Assign complexity levels (Low/Medium/High/Critical)
+- [ ] **Platform Considerations**: Account for platform-specific requirements
+- [ ] **Testing Strategy**: Plan comprehensive testing approach
+
+### After Time Estimation
+
+- [ ] **Milestone Definition**: Define success criteria for each phase
+- [ ] **Progress Tracking**: Set up monitoring and tracking mechanisms
+- [ ] **Documentation**: Document estimation process and assumptions
+- [ ] **Stakeholder Communication**: Share estimation approach and progress focus