# 12. Modeling Tool - Apply Modifier

**Date:** 2025-11-22  
**Version:** 0.1.11  
**Tasks:** TASK-008

## 🚀 Key Changes

### Domain Layer (`server/domain/tools/modeling.py`)
- Added `apply_modifier(name: str, modifier_name: str) -> str` method to `IModelingTool` interface.

### Blender Addon (Server Side)
- **`blender_addon/application/handlers/modeling.py`**:
  - Implemented `apply_modifier`:
    - Finds object and modifier.
    - Activates the object (required for operators).
    - Calls `bpy.ops.object.modifier_apply(modifier=modifier_name)`.
    - Returns descriptive result or raises `ValueError` if not found.
- **`blender_addon/__init__.py`**:
  - Registered `modeling.apply_modifier` RPC handler.

### Application Layer (`server/application/tool_handlers/modeling_handler.py`)
- Implemented `apply_modifier` in `ModelingToolHandler`, delegating to RPC client.

### Adapters Layer (`server/adapters/mcp/server.py`)
- Registered new MCP tool `apply_modifier(name, modifier_name)`.

### Testing
- Updated `tests/test_modeling_tools.py`:
  - Added `test_apply_modifier`.
  - Added error handling tests (`test_apply_modifier_object_not_found`, `test_apply_modifier_not_found_on_object`).
  - Fixed assertions to expect `ValueError` (direct handler test).

This feature completes the core set of object-level modeling tools, allowing the AI to finalize non-destructive edits.
