# 91 - Object Inspection Tools (2025-12-04)

**Task:** [TASK-045](../_TASKS/TASK-045_Object_Inspection_Tools.md)
**Type:** Feature Addition
**Priority:** 🟡 Medium

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## Summary

Implemented 6 new object inspection tools for deeper analysis of 3D objects. These tools provide access to metadata, hierarchy, spatial information, and material node graphs.

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## New Tools

### Scene Tools (5 new)

| Tool | Description |
|------|-------------|
| `scene_get_custom_properties` | Read custom properties (metadata) from an object |
| `scene_set_custom_property` | Set or delete custom properties on an object |
| `scene_get_hierarchy` | Get parent-child hierarchy for objects or full scene |
| `scene_get_bounding_box` | Get precise bounding box corners (world/local space) |
| `scene_get_origin_info` | Get object origin/pivot point information |

### Material Tools (1 new)

| Tool | Description |
|------|-------------|
| `material_inspect_nodes` | Inspect material shader node graph with connections |

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## Implementation Details

### 4-Layer Architecture

Each tool implemented across all 4 layers:

1. **Domain Layer** (`server/domain/tools/`)
   - Added abstract methods to `ISceneTool` and `IMaterialTool` interfaces

2. **Application Layer** (`server/application/tool_handlers/`)
   - Implemented RPC bridge handlers in `scene_handler.py` and `material_handler.py`

3. **Adapter Layer** (`server/adapters/mcp/areas/`)
   - Added MCP tool definitions with semantic tags
   - Updated dispatcher with tool mappings

4. **Blender Addon** (`blender_addon/application/handlers/`)
   - Implemented Blender API handlers using `bpy`
   - Registered RPC handlers in `__init__.py`

### Router Metadata

Created 6 router metadata JSON files:
- `server/router/infrastructure/tools_metadata/scene/scene_get_custom_properties.json`
- `server/router/infrastructure/tools_metadata/scene/scene_set_custom_property.json`
- `server/router/infrastructure/tools_metadata/scene/scene_get_hierarchy.json`
- `server/router/infrastructure/tools_metadata/scene/scene_get_bounding_box.json`
- `server/router/infrastructure/tools_metadata/scene/scene_get_origin_info.json`
- `server/router/infrastructure/tools_metadata/material/material_inspect_nodes.json`

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## Use Cases

- **Custom Properties**: Adding descriptive metadata/comments to objects, export tags, game properties
- **Hierarchy**: Understanding object relationships and parent-child structures
- **Bounding Box**: Precise spatial analysis for collision detection and positioning
- **Origin Info**: Transformation planning, origin adjustment decisions
- **Material Nodes**: Understanding procedural materials and shader networks

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## Files Changed

### Server Side
- `server/domain/tools/scene.py` - Added 5 abstract methods
- `server/domain/tools/material.py` - Added 1 abstract method
- `server/application/tool_handlers/scene_handler.py` - Added 5 RPC handlers
- `server/application/tool_handlers/material_handler.py` - Added 1 RPC handler
- `server/adapters/mcp/areas/scene.py` - Added 5 MCP tools
- `server/adapters/mcp/areas/material.py` - Added 1 MCP tool
- `server/adapters/mcp/dispatcher.py` - Added 6 tool mappings

### Blender Addon
- `blender_addon/application/handlers/scene.py` - Added 5 handler methods
- `blender_addon/application/handlers/material.py` - Added 1 handler method
- `blender_addon/__init__.py` - Registered 6 RPC handlers

### Router Metadata
- Created 6 JSON metadata files

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## Testing

All existing tests continue to pass (1636 total: 1341 unit + 295 e2e).

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## Related Tasks

- **TASK-043** (Scene Utility Tools) - Foundation for scene inspection
- **TASK-044** (Extraction Analysis Tools) - Complements extraction workflow
