---
title: "Phase 1: Unwrap Audit and Risk Categorization"
issue: UNWRAP-AUDIT-001
status: In Progress
created: 2025-11-24T14:35:54.573297886+00:00
updated: 2025-11-24T14:35:54.573297886+00:00
---

# Unwrap Audit Phase 1: Risk Categorization

**Ticket ID**: UNWRAP-AUDIT-001
**Status**: In Progress
**Inspired By**: pmat-mcp-agent-toolkit unwrap elimination (commits e06b70b6-7d30becc)

## Summary

Systematic audit of all 405 `.unwrap()` calls in renacer source code to categorize by risk level and create elimination roadmap. This is Phase 1 of a 4-phase unwrap elimination campaign following pmat's proven methodology that achieved 60/60 unwraps eliminated (100% Known Defects score).

**Current State**: 405 unwraps (defect risk in production)
**Target State**: Complete risk categorization → Zero unwraps (Phases 2-4)

## Requirements

### Functional Requirements

- [x] Count total unwraps in src/ (405 confirmed)
- [ ] Categorize all unwraps by risk level (Critical/High/Medium/Low)
- [ ] Generate per-file unwrap report with line numbers
- [ ] Identify critical syscall/ptrace unwraps
- [ ] Document elimination strategy for each category
- [ ] Create Phase 2-4 roadmap with priorities

### Non-Functional Requirements

- **Accuracy**: 100% of unwraps identified and categorized
- **Actionability**: Each unwrap tagged with replacement strategy
- **Documentation**: Comprehensive report for future phases

## Risk Categories

### Critical (Priority 1 - Sprint 46)
**Definition**: Production operations that can fail in normal use
**Examples**: Ptrace, file I/O, network, resource allocation
**Strategy**: Replace with `?` propagation

### High (Priority 2 - Sprint 47)
**Definition**: Parsing operations that can fail with invalid input
**Examples**: DWARF parsing, JSON/TOML deserialization, regex
**Strategy**: Replace with `?` or graceful fallback

### Medium (Priority 3 - Sprint 48)
**Definition**: Configuration operations that should fail early
**Examples**: CLI args, env vars, config files
**Strategy**: Replace with `.expect()` with clear message

### Low (Priority 4 - Sprint 48)
**Definition**: Hardcoded constants that cannot fail
**Examples**: Compile-time literals, infallible conversions
**Strategy**: Replace with `.expect()` with justification

## Implementation Plan

### Phase 1: Automated Discovery ✅
- [x] Run `grep -rn "\.unwrap()" src/` (405 unwraps found)
- [x] Count per-file breakdown (decision_trace.rs: 64, function_profiler.rs: 51, etc.)
- [x] Identify critical ptrace/syscall unwraps (120 found)

### Phase 2: Manual Risk Analysis
- [ ] Read each unwrap in context (405 total)
- [ ] Categorize by risk level (Critical/High/Medium/Low)
- [ ] Tag with elimination strategy

### Phase 3: Report Generation
- [ ] Create comprehensive unwrap report
- [ ] Generate statistics (total by category, per-file breakdown)
- [ ] Prioritize elimination order

### Phase 4: Roadmap Creation
- [ ] Create UNWRAP-CRITICAL-001 spec (Sprint 46)
- [ ] Create UNWRAP-HIGH-001 spec (Sprint 47)
- [ ] Create UNWRAP-MEDIUM-LOW-001 spec (Sprint 48)
- [ ] Update roadmap.yaml with Phase 2-4 tasks

## Success Criteria

- ✅ All 405 unwraps categorized by risk level
- ✅ Comprehensive report with line numbers and strategies
- ✅ Phase 2-4 specs created and added to roadmap
- ✅ Zero defects introduced (audit only, no code changes)

## Estimated Effort

| Phase | Risk Level | Est. Count | Effort (hours) |
|-------|------------|------------|----------------|
| 2 (Sprint 46) | Critical | ~50-80 | 15-20 |
| 3 (Sprint 47) | High | ~100-150 | 20-30 |
| 4 (Sprint 48) | Medium/Low | ~175-255 | 10-15 |
| **Total** | **All** | **405** | **45-65** |

## References

- pmat unwrap elimination: commits e06b70b6, 7d30becc, d5db1e8d
- PMAT Improvements Analysis: `docs/specifications/pmat-improvements-analysis.md`
