BlenderMCP

Instructions

Implementation Reference

• src/blender_mcp/server.py:411-460 (handler)

  The @mcp.tool() decorated function that implements and registers the download_polyhaven_asset tool. It sends the download command to the Blender addon and processes the response with type-specific messages.
  @mcp.tool() def download_polyhaven_asset( ctx: Context, asset_id: str, asset_type: str, resolution: str = "1k", file_format: str = None ) -> str: """ Download and import a Polyhaven asset into Blender. Parameters: - asset_id: The ID of the asset to download - asset_type: The type of asset (hdris, textures, models) - resolution: The resolution to download (e.g., 1k, 2k, 4k) - file_format: Optional file format (e.g., hdr, exr for HDRIs; jpg, png for textures; gltf, fbx for models) Returns a message indicating success or failure. """ try: blender = get_blender_connection() result = blender.send_command("download_polyhaven_asset", { "asset_id": asset_id, "asset_type": asset_type, "resolution": resolution, "file_format": file_format }) if "error" in result: return f"Error: {result['error']}" if result.get("success"): message = result.get("message", "Asset downloaded and imported successfully") # Add additional information based on asset type if asset_type == "hdris": return f"{message}. The HDRI has been set as the world environment." elif asset_type == "textures": material_name = result.get("material", "") maps = ", ".join(result.get("maps", [])) return f"{message}. Created material '{material_name}' with maps: {maps}." elif asset_type == "models": return f"{message}. The model has been imported into the current scene." else: return message else: return f"Failed to download asset: {result.get('message', 'Unknown error')}" except Exception as e: logger.error(f"Error downloading Polyhaven asset: {str(e)}") return f"Error downloading Polyhaven asset: {str(e)}"