# Code Review: Section 11 — Input Mouse Motion

## Findings

### 1. MISSING PYTHON-SIDE VALIDATION (High)
No validation in input_sim.py for mouse_motion command. AI agent can send `{"mouse_motion": "garbage"}` with no error.

### 2. MISSING TEST: validation error for missing relative_x/y (Medium)
No test for malformed mouse_motion input.

### 3. MISSING TEST: mixed commands with mouse_motion (Medium)
No test verifying mouse_motion interleaved with other command types.

### 4. MISSING TEST: TOOL_DESCRIPTION mentions mouse_motion (Low)
No assertion guarding against regression of the description text.

### 5. GDScript: no velocity field on InputEventMouseMotion (Low-Medium)
Only `event.relative` is set. Some Godot FPS implementations read `event.velocity`. Could be a known limitation.

### 6. GDScript: silent zero-default for missing keys (Low-Medium)
`motion_data.get("relative_x", 0)` silently defaults if key absent instead of erroring.

### 7. Tests are mock-only (Observation)
Both tests mock the bridge. Consistent with existing tests but doesn't test real validation logic.
