---
phase: 03-diagnostic-features
fixed_at: 2026-04-12T00:00:00Z
review_path: .planning/phases/03-diagnostic-features/03-REVIEW.md
iteration: 1
findings_in_scope: 4
fixed: 4
skipped: 0
status: all_fixed
---

# Phase 03: Code Review Fix Report

**Fixed at:** 2026-04-12T00:00:00Z
**Source review:** .planning/phases/03-diagnostic-features/03-REVIEW.md
**Iteration:** 1

**Summary:**
- Findings in scope: 4
- Fixed: 4
- Skipped: 0

## Fixed Issues

### WR-01: Missing dimension mismatch guard in pixel-compare compareFrames

**Files modified:** `src/processing/pixel-compare.ts`
**Commit:** 0885c8e
**Applied fix:** Added dimension and channel count validation at the start of `compareFrames`. Throws a descriptive error if `a` and `b` frames have mismatched width, height, or channels, preventing silent buffer overruns.

### WR-02: Idle compressor logic emits non-idle single frames incorrectly on transitions

**Files modified:** `src/processing/idle-compressor.ts`
**Commit:** 73d002f
**Applied fix:** Added `lastWasIdle` boolean tracking. Updated the flush logic at end of loop to check whether trailing frames are actually an idle run before collapsing them. When trailing frames are not idle, they are pushed individually instead of being incorrectly collapsed. Status: fixed: requires human verification (logic bug fix).

### WR-03: GIF resource handler has no error handling for processing pipeline

**Files modified:** `src/server.ts`
**Commit:** 5078c45
**Applied fix:** Wrapped the entire GIF processing pipeline (idle compression, delta highlighting, GIF export) in a try/catch block. On failure, logs the error and returns a text/plain error response instead of crashing the MCP server.

### WR-04: Grid compiler passes zero frames to sharp composite on empty input

**Files modified:** `src/processing/grid-compiler.ts`
**Commit:** ce5c408
**Applied fix:** Added early guard `if (frames.length === 0) throw new Error(...)` at the top of `compileGrid`, before any math operations on frame count. Prevents NaN/Infinity dimensions from reaching sharp.

---

_Fixed: 2026-04-12T00:00:00Z_
_Fixer: Claude (gsd-code-fixer)_
_Iteration: 1_