# TRUST 5 Framework Deep Dive

> Module: Advanced TRUST 5 methodology with category-specific analysis patterns
> Parent: [TRUST 5 Validation](../trust5-validation.md)
> Complexity: Advanced
> Time: 25+ minutes
> Dependencies: Python 3.8+, Context7 MCP, ast

## Quick Reference

### TRUST 5 Methodology

TRUST 5 Framework provides comprehensive code quality assessment across five essential dimensions:

**Truthfulness (25%)**: Code correctness and logic accuracy
- Validates algorithmic correctness
- Detects logic errors and unreachable code
- Ensures data flow integrity
- Verifies contract compliance
- See: [Truthfulness Analysis](./trust5-framework/truthfulness-analysis.md)

**Relevance (20%)**: Requirements fulfillment and purpose alignment
- Confirms feature completeness
- Validates requirements traceability
- Identifies dead code
- Checks purpose alignment
- See: [Relevance Analysis](./trust5-framework/relevance-analysis.md)

**Usability (25%)**: Maintainability and understandability
- Assesses code organization
- Evaluates documentation quality
- Measures complexity metrics
- Validates naming conventions
- See: [Usability Analysis](./trust5-framework/usability-analysis.md)

**Safety (20%)**: Security and error handling
- Detects security vulnerabilities
- Validates error handling
- Ensures resource safety
- Checks input validation
- See: [Safety Analysis](./trust5-framework/safety-analysis.md)

**Timeliness (10%)**: Performance and modern practices
- Identifies optimization opportunities
- Detects deprecated code
- Validates performance standards
- Checks technology currency
- See: [Timeliness Analysis](./trust5-framework/timeliness-analysis.md)

### Category-Specific Analysis Patterns

```python
class AdvancedTRUST5Analyzer:
    """Advanced TRUST 5 analyzer with category-specific patterns."""

    def __init__(self, context7_client=None):
        self.context7 = context7_client
        self.category_patterns = {}

    async def load_category_patterns(self) -> Dict[str, Any]:
        """Load category-specific analysis patterns from Context7."""

        if not self.context7:
            return self._get_default_patterns()

        try:
            # Load truthfulness patterns
            truthfulness = await self.context7.get_library_docs(
                context7_library_id="/code-correctness/python",
                topic="logic error detection patterns 2025",
                tokens=3000
            )

            # Load usability patterns
            usability = await self.context7.get_library_docs(
                context7_library_id="/code-quality/sonarqube",
                topic="maintainability metrics code smells 2025",
                tokens=4000
            )

            # Load safety patterns
            safety = await self.context7.get_library_docs(
                context7_library_id="/security/owasp",
                topic="security vulnerability detection 2025",
                tokens=5000
            )

            return {
                'truthfulness': truthfulness,
                'usability': usability,
                'safety': safety
            }

        except Exception as e:
            return self._get_default_patterns()
```

---

## Category Analysis Overview

### Truthfulness Analysis

**Purpose**: Validates code correctness and logic accuracy

**Key Detection Patterns**:
- Tautological comparisons (always True/False)
- Contradictory conditions in logic paths
- Constant conditions using only constants
- Type confusion between incompatible types
- Undefined variable references
- Unused variable declarations
- Variable shadowing across scopes

**Implementation**: See [Truthfulness Analysis](./trust5-framework/truthfulness-analysis.md) for detailed logic validation, data flow analysis, and Context7 integration patterns.

### Relevance Analysis

**Purpose**: Validates requirements fulfillment and purpose alignment

**Key Detection Patterns**:
- Missing requirement implementations
- Unused functions and classes
- Dead code (commented blocks, unreachable code)
- Unresolved TODO/FIXME markers
- Over-engineering beyond requirements
- Feature creep detection

**Implementation**: See [Relevance Analysis](./trust5-framework/relevance-analysis.md) for requirements traceability, dead code detection, and purpose alignment validation.

### Usability Analysis

**Purpose**: Assesses maintainability and understandability

**Key Detection Patterns**:
- High complexity (cyclomatic, cognitive)
- Poor naming conventions
- Long functions and deep nesting
- Magic numbers without constants
- Code duplication
- Missing documentation
- Poor separation of concerns

**Metrics**:
- Halstead complexity metrics
- Maintainability Index (MI)
- Coupling and cohesion measurements
- Code organization assessment

**Implementation**: See [Usability Analysis](./trust5-framework/usability-analysis.md) for advanced maintainability metrics, Halstead calculations, and code organization assessment.

### Safety Analysis

**Purpose**: Detects security vulnerabilities and validates error handling

**Key Detection Patterns**:
- SQL injection vulnerabilities
- XSS vulnerabilities in web contexts
- Resource leaks (files, connections)
- Race conditions in concurrent code
- Missing error handling
- Weak cryptography usage
- Hardcoded secrets and credentials

**Security Coverage**:
- OWASP Top 10 vulnerability patterns
- Resource safety validation
- Error handling best practices
- Input validation completeness

**Implementation**: See [Safety Analysis](./trust5-framework/safety-analysis.md) for advanced security analysis, resource leak detection, and Context7 OWASP integration.

### Timeliness Analysis

**Purpose**: Identifies performance optimization opportunities and modern practices

**Key Detection Patterns**:
- Inefficient data structure usage
- Missing caching opportunities
- Suboptimal algorithm choices
- Unoptimized I/O operations
- Deprecated API usage
- Technology currency issues

**Performance Optimization**:
- Algorithmic efficiency checks
- Caching opportunity detection
- Data structure optimization
- Async/await recommendations

**Implementation**: See [Timeliness Analysis](./trust5-framework/timeliness-analysis.md) for performance optimization detection, caching opportunities, and technology currency checks.

---

## Advanced Scoring

### Weighted Category Scoring

TRUST 5 uses weighted scoring with category-specific weights:
- Truthfulness: 25%
- Relevance: 20%
- Usability: 25%
- Safety: 20%
- Timeliness: 10%

**Score Calculation Factors**:
- Severity weighting (critical, high, medium, low)
- Confidence scoring from detection algorithms
- Impact factor based on code context
- Complexity adjustment for file size/complexity
- Trend factor based on historical data

**Score Interpretation**:
- 0.90-1.00: Excellent quality
- 0.75-0.89: Good quality
- 0.60-0.74: Acceptable quality
- 0.40-0.59: Needs improvement
- 0.00-0.39: Critical issues

**Implementation**: See [Scoring Algorithms](./trust5-framework/scoring-algorithms.md) for comprehensive scoring methodology, factor calculations, and trend analysis.

---

## Best Practices

1. **Pattern Customization**: Customize category-specific patterns for project context
2. **Context7 Integration**: Leverage latest patterns from Context7 for accuracy
3. **Weight Adjustment**: Adjust category weights based on project priorities
4. **Trend Analysis**: Track score trends over time for improvement monitoring
5. **Team Alignment**: Ensure category definitions align with team understanding
6. **Regular Updates**: Update patterns regularly to reflect evolving best practices
7. **CI/CD Integration**: Integrate with CI/CD for continuous quality monitoring
8. **Education**: Educate team on TRUST 5 methodology for consistent application

---

## Related Modules

- [TRUST 5 Validation](../trust5-validation.md): Core TRUST 5 implementation
- [Security Analysis](../security-analysis.md): Safety category deep dive
- [Quality Metrics](../quality-metrics.md): Usability category metrics
- [Static Analysis](../static-analysis.md): Automated analysis tools

---

Version: 1.1.0 (Modularized)
Last Updated: 2026-01-06
Module: `modules/automated-code-review/trust5-framework.md`

## Submodules

- [Truthfulness Analysis](./trust5-framework/truthfulness-analysis.md): Logic correctness and data flow
- [Relevance Analysis](./trust5-framework/relevance-analysis.md): Requirements traceability and dead code
- [Usability Analysis](./trust5-framework/usability-analysis.md): Maintainability metrics and code organization
- [Safety Analysis](./trust5-framework/safety-analysis.md): Security vulnerabilities and error handling
- [Timeliness Analysis](./trust5-framework/timeliness-analysis.md): Performance optimization and modern practices
- [Scoring Algorithms](./trust5-framework/scoring-algorithms.md): Weighted scoring and trend analysis
