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set_texture

Apply downloaded Polyhaven textures to 3D objects in Blender to enhance visual appearance and material properties.

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, sends a 'set_texture' command with object_name and texture_id parameters, processes the response, and returns detailed information about the applied material and texture nodes.
    @telemetry_tool("set_texture")
    @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)}"
  • The @mcp.tool() decorator registers the set_texture function as an MCP tool, and @telemetry_tool adds telemetry tracking.
    @telemetry_tool("set_texture")
    @mcp.tool()
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions that the texture must be downloaded first (a prerequisite) and describes the return value. However, it doesn't disclose critical behavioral traits like whether this operation is destructive (modifies the object permanently), what permissions are needed, error conditions, or rate limits. For a mutation tool with zero annotation coverage, this leaves significant 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 structured and concise. It opens with a clear purpose statement, then provides a bulleted list of parameters with explanations, and ends with return value information. Every sentence earns its place, with zero wasted words, making it easy to scan and understand quickly.

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?

Given the tool's complexity (a mutation operation with 2 parameters), no annotations, and no output schema, the description does an adequate job but has clear gaps. It covers the basic purpose, parameters, and return value, but lacks details on behavioral aspects like destructiveness, error handling, or integration with sibling tools. For a tool that modifies objects, more context would be beneficial.

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?

The schema description coverage is 0%, so the description must fully compensate. It explicitly lists both parameters ('object_name' and 'texture_id') with clear semantic explanations: 'Name of the object to apply the texture to' and 'ID of the Polyhaven texture to apply (must be downloaded first)'. This adds essential meaning beyond the bare schema, fully documenting parameter purposes and constraints.

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'), resource ('previously downloaded Polyhaven texture'), and target ('to an object'). It distinguishes from siblings like 'download_polyhaven_asset' (which downloads textures) and 'get_object_info' (which retrieves information). The verb+resource combination is precise and unambiguous.

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 about prerequisites ('must be downloaded first'), which implicitly guides when to use this tool versus alternatives. However, it doesn't explicitly state when NOT to use it or name specific alternative tools for similar operations. The guidance is helpful but not exhaustive.

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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