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download_polyhaven_asset

Download Polyhaven assets like HDRIs, textures, and models directly into Blender for 3D projects. Specify asset ID, type, resolution, and format to import resources.

Instructions

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.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
asset_idYes
asset_typeYes
resolutionNo1k
file_formatNo

Implementation Reference

  • The 'download_polyhaven_asset' tool is implemented here. It takes asset details and sends a command to the Blender connection to perform the download.
    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)}"
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden. It correctly discloses the return type ('message indicating success or failure') and the import side-effect. However, it omits critical behavioral details: that this performs network I/O, modifies the Blender scene state destructively, and may overwrite existing assets. Missing timeout, disk space, or error handling specifics.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Optimal structure with clear sections: purpose statement, parameter documentation, return value. No wasted words; the 'Parameters' and 'Returns' headers create scannable structure. Length is appropriate for the complexity (4 params, no schema descriptions).

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Comprehensive given no output schema and no annotations. Covers all four parameters and return behavior. Minor gap: does not clarify import behavior details (e.g., whether assets are added to the current scene, asset library, or both) or prerequisites like requiring a valid asset_id from search.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Exemplary compensation for 0% schema coverage. Provides specific valid values for asset_type (hdris, textures, models), format examples for resolution (1k, 2k, 4k), and conditional format mappings for file_format (hdr/exr for HDRIs, etc.). Each parameter includes clarifying context not present in the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Opens with specific action 'Download and import', specific resource 'Polyhaven asset', and target environment 'into Blender'. Clearly distinguishes from sibling Sketchfab tools and generation tools via the Polyhaven namespace.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Lacks explicit when-to-use guidance or prerequisites. Does not mention that users should typically call search_polyhaven_assets first to obtain valid asset_ids, or when to prefer import_generated_asset instead. Usage is implied by the workflow description but not stated explicitly.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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