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set_texture

Apply downloaded Polyhaven textures to objects in Blender for realistic material application in 3D scenes.

Instructions

Apply a previously downloaded Polyhaven texture to an object.

Parameters:
- object_name: Name of the object to apply the texture to
- texture_id: ID of the Polyhaven texture to apply (must be downloaded first)

Returns a message indicating success or failure.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
object_nameYes
texture_idYes

Implementation Reference

  • The handler function for the 'set_texture' MCP tool. It connects to Blender via socket, sends a 'set_texture' command with object_name and texture_id parameters, processes the response, and returns a detailed status message including material information and node details.
    @mcp.tool()
    def set_texture(
        ctx: Context,
        object_name: str,
        texture_id: str
    ) -> str:
        """
        Apply a previously downloaded Polyhaven texture to an object.
        
        Parameters:
        - object_name: Name of the object to apply the texture to
        - texture_id: ID of the Polyhaven texture to apply (must be downloaded first)
        
        Returns a message indicating success or failure.
        """
        try:
            # Get the global connection
            blender = get_blender_connection()
            result = blender.send_command("set_texture", {
                "object_name": object_name,
                "texture_id": texture_id
            })
            
            if "error" in result:
                return f"Error: {result['error']}"
            
            if result.get("success"):
                material_name = result.get("material", "")
                maps = ", ".join(result.get("maps", []))
                
                # Add detailed material info
                material_info = result.get("material_info", {})
                node_count = material_info.get("node_count", 0)
                has_nodes = material_info.get("has_nodes", False)
                texture_nodes = material_info.get("texture_nodes", [])
                
                output = f"Successfully applied texture '{texture_id}' to {object_name}.\n"
                output += f"Using material '{material_name}' with maps: {maps}.\n\n"
                output += f"Material has nodes: {has_nodes}\n"
                output += f"Total node count: {node_count}\n\n"
                
                if texture_nodes:
                    output += "Texture nodes:\n"
                    for node in texture_nodes:
                        output += f"- {node['name']} using image: {node['image']}\n"
                        if node['connections']:
                            output += "  Connections:\n"
                            for conn in node['connections']:
                                output += f"    {conn}\n"
                else:
                    output += "No texture nodes found in the material.\n"
                
                return output
            else:
                return f"Failed to apply texture: {result.get('message', 'Unknown error')}"
        except Exception as e:
            logger.error(f"Error applying texture: {str(e)}")
            return f"Error applying texture: {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 discloses that this is a mutation operation ('Apply') and mentions a prerequisite (texture must be downloaded first), but doesn't cover other behavioral aspects like error conditions, permissions needed, or what happens if the object doesn't exist. It adds some context but leaves gaps.

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?

The description is perfectly front-loaded with the core purpose in the first sentence, followed by clear parameter explanations. Every sentence earns its place with no wasted words, and the structure is logical and efficient.

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

Completeness3/5

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

For a mutation tool with no annotations and no output schema, the description provides adequate basic information about what the tool does and its parameters. However, it lacks details about return values (only mentions 'message indicating success or failure' without specifics), error handling, or integration with other tools like download_polyhaven_asset.

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

Parameters4/5

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

With 0% schema description coverage, the description must compensate. It provides meaningful explanations for both parameters: 'Name of the object to apply the texture to' and 'ID of the Polyhaven texture to apply (must be downloaded first)'. This adds substantial value beyond the bare schema, though it doesn't specify format constraints or examples.

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?

The description clearly states the specific action ('Apply a previously downloaded Polyhaven texture') and target resource ('to an object'), distinguishing it from siblings like download_polyhaven_asset or search_polyhaven_assets. It specifies the exact verb and resource combination.

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

Usage Guidelines4/5

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

The description provides clear context by stating the texture must be 'downloaded first' and referencing Polyhaven textures, which helps differentiate from other texture-related tools. However, it doesn't explicitly mention when NOT to use this tool or name specific alternatives among siblings.

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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