fresh-eyes-review

What this skill does

# Fresh-Eyes Review

## Core Principle

**"NO COMMIT WITHOUT FRESH-EYES REVIEW FIRST"**

This represents a final quality gate executed *after* implementation completion, passing tests, and peer review. The discipline applies universally, even without explicit skill activation.

## Key Distinctions

Fresh-eyes review differs fundamentally from testing and code review:

| Approach | Focus | Blind Spots |
|----------|-------|-------------|
| **Testing** | Validates expected behavior | Can't test for unknown edge cases |
| **Code review** | Patterns and quality | Reviewer trusts author's intent |
| **Fresh-eyes** | Deliberate re-reading with psychological distance | Catches what you thought was correct |

**Critical insight**: "100% test coverage and passing scenarios" can coexist with "critical bugs" waiting discovery.

## Required Process

### Step 1 - Announce Commitment

Explicitly declare: "Starting fresh-eyes review of [N] files. This will take 2-5 minutes."

This announcement creates accountability and reframes your mindset from implementation to audit.

### Step 2 - Security Vulnerability Checklist

Review all touched files for security issues:

| Vulnerability | What to Check |
|---------------|---------------|
| **SQL Injection** | All database queries use parameterized statements, never string concatenation |
| **XSS** | All user-provided content is escaped before rendering in HTML |
| **Path Traversal** | File paths are validated, `../` sequences rejected or normalized |
| **Command Injection** | Shell commands don't include unsanitized user input |
| **IDOR** | Resources are access-controlled, not just unguessable IDs |
| **Auth Bypass** | Every protected endpoint checks authentication and authorization |

**Example finding:**
```typescript
// Before: SQL injection vulnerability
const user = await db.query(`SELECT * FROM users WHERE id = '${userId}'`);

// After: Parameterized query
const user = await db.query('SELECT * FROM users WHERE id = $1', [userId]);
```

### Step 3 - Logic Error Checklist

| Error Type | What to Check |
|------------|---------------|
| **Off-by-one** | Array indices, loop bounds, pagination limits |
| **Race conditions** | Concurrent access to shared state, async operations |
| **Null/undefined** | Every `.` chain could throw; defensive checks present? |
| **Type coercion** | `==` vs `===`, implicit conversions |
| **State mutations** | Unexpected side effects on input parameters? |
| **Error swallowing** | Empty catch blocks, ignored promise rejections |

**Example finding:**
```typescript
// Before: Off-by-one in pagination
const hasMore = results.length < pageSize;

// After: Correct boundary
const hasMore = results.length === pageSize;
```

### Step 4 - Business Rule Checklist

| Check | Questions |
|-------|-----------|
| **Calculations** | Do formulas match requirements exactly? Currency rounding correct? |
| **Conditions** | AND vs OR logic correct? Negations applied properly? |
| **Edge cases** | Empty input, single item, maximum values, zero values? |
| **Error messages** | User-friendly? Leak no sensitive information? |
| **Default values** | Sensible defaults when optional fields omitted? |

**Example finding:**
```typescript
// Before: Tax calculation uses wrong rounding
const tax = price * 0.08;

// After: Proper currency rounding
const tax = Math.round(price * 0.08 * 100) / 100;
```

### Step 5 - Performance Checklist

| Issue | What to Check |
|-------|---------------|
| **N+1 queries** | Loops that make database calls should be batched |
| **Unbounded loops** | Maximum iterations, timeout protection |
| **Memory leaks** | Event listeners removed, streams closed, references cleared |
| **Missing indexes** | Queries filter/sort on indexed columns? |
| **Large payloads** | Pagination implemented? Response size bounded? |

### Step 6 - Fix Immediately

Address findings before declaring completion:
1. Make the fix
2. Add test covering the issue (if not present)
3. Re-run full test suite
4. Re-run linter/type checker

### Step 7 - Declare Results

Mandatory announcement:

```
Fresh-eyes complete. [N] issues found and fixed:
- [Brief description of each issue and fix]
```

Include this even for zero findings—it proves execution.

## Time Commitment

| File Count | Expected Duration |
|------------|-------------------|
| 1-3 files | 2 minutes |
| 4-10 files | 3-4 minutes |
| 10+ files | 5 minutes max |

**Warning signs:**
- Faster than 2 minutes suggests insufficient depth
- More than 5 minutes indicates scope creep—stay focused on the changed code

## Resistance Patterns to Reject

The following rationalizations must be explicitly rejected:

| Rationalization | Reality |
|-----------------|---------|
| "Tests are comprehensive" | Tests validate design, not correctness |
| "I'm confident it's correct" | Confidence is inversely correlated with bugs |
| "Partner is waiting" | 3 minutes now saves 3 hours debugging later |
| "Production is blocked" | Rushing causes the outages being rushed to fix |
| "Senior dev already approved" | They reviewed intent, not implementation details |
| "It's just a small change" | Small changes cause large outages |

**These circumstances represent precisely when critical bugs escape into production.**

## Example Workflow

```
User: "I'm done implementing the auth feature, let me commit"
Assistant: [Triggers fresh-eyes-review skill]

Starting fresh-eyes review of 4 files. This will take 2-5 minutes.

[Reviews auth.ts for security]
- Found: Missing input validation on email field
- Fixed: Added email format validation

[Reviews handler.ts for logic]
- Found: Off-by-one error in pagination
- Fixed: Changed < to <= in boundary check

[Reviews db.ts for performance]
- No issues found

[Reviews api.ts for business rules]
- No issues found

Re-running tests... All tests pass

Fresh-eyes complete. 2 issues found and fixed.
```