# Changelog #33 - Scene Inspect Mesh Topology (TASK-014-13)

**Date:** 2025-11-27
**Version:** 1.9.12
**Phase:** Phase 7 - Introspection & Listing APIs
**Task:** TASK-014-13

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## 📋 Summary

Implemented `scene_inspect_mesh_topology` tool to provide detailed geometry analysis (vertex/edge/face counts, N-gon detection). Includes an optional `detailed` mode that checks for non-manifold geometry and loose elements using BMesh.

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## ✨ Features Added

### Domain Layer
- **`server/domain/tools/scene.py`**
  - Added `inspect_mesh_topology(object_name, detailed)` to `ISceneTool`.

### Application Layer
- **`server/application/tool_handlers/scene_handler.py`**
  - Implemented `inspect_mesh_topology` delegating to RPC.

### Blender Addon Handler
- **`blender_addon/application/handlers/scene.py`**
  - Implemented `inspect_mesh_topology`.
  - Uses `bmesh.from_mesh(obj.data)` to analyze geometry without affecting scene state (even in Edit Mode).
  - Calculates basic stats (triangles, quads, ngons).
  - Calculates advanced stats if `detailed=True` (non-manifold edges, loose vertices/edges).

### MCP Adapter
- **`server/adapters/mcp/server.py`**
  - Exposed `scene_inspect_mesh_topology` tool.
  - Formats report with nested counts and optional detailed checks.

### Registration
- **`blender_addon/__init__.py`**
  - Registered `scene.inspect_mesh_topology` RPC endpoint.

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## 📊 Return Data Structure

```json
{
  "object_name": "Cube",
  "vertex_count": 8,
  "edge_count": 12,
  "face_count": 6,
  "triangle_count": 0,
  "quad_count": 6,
  "ngon_count": 0,
  "non_manifold_edges": 0,
  "loose_vertices": 0,
  "loose_edges": 0
}
```

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## 🧪 Testing

### Test File
- **`tests/test_scene_inspect_mesh_topology.py`**
  - Verified basic topology counts (quads, tris).
  - Verified detailed checks (non-manifold detection).
  - Validated BMesh lifecycle management (`bm.free()`).

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## 📚 Documentation Updates

- Updated `_docs/SCENE_TOOLS_ARCHITECTURE.md`.
- Updated `_docs/AVAILABLE_TOOLS_SUMMARY.md`.
- Updated `_docs/_TASKS/TASK-014-13_Scene_Inspect_Mesh_Topology.md`.

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**Status:** ✅ Complete
**Next:** TASK-014-14 (Scene Inspect Modifiers)
