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apply_material

Assign materials to 3D objects in Cinema 4D by specifying material and object names for scene texturing.

Instructions

Apply a material to an object.

Args:
    material_name: Name of the material to apply
    object_name: Name of the object to apply the material to

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
material_nameYes
object_nameYes

Implementation Reference

  • The handler function for the apply_material tool, which manages connection to Cinema 4D and dispatches the command.
    async def apply_material(material_name: str, object_name: str, ctx: Context) -> str:
        """
        Apply a material to an object.
    
        Args:
            material_name: Name of the material to apply
            object_name: Name of the object to apply the material to
        """
        async with c4d_connection_context() as connection:
            if not connection.connected:
                return "❌ Not connected to Cinema 4D"
    
            # Send command to Cinema 4D
            response = send_to_c4d(
                connection,
                {
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 states the action ('apply') but doesn't describe what happens during application (e.g., whether it overwrites existing materials, requires specific permissions, has side effects like scene modification, or what the expected outcome is). This leaves significant gaps for a mutation tool.

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

Conciseness4/5

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

The description is brief and front-loaded with the core purpose in the first sentence, followed by parameter details. There's minimal waste, though the 'Args' formatting could be more integrated. It efficiently conveys essential information without unnecessary elaboration.

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

Completeness2/5

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

Given the complexity of a mutation tool with no annotations and no output schema, the description is incomplete. It lacks details on behavior (e.g., success/failure outcomes, error conditions), prerequisites, and how it fits among sibling tools (e.g., 'apply_shader'), leaving the agent with insufficient context for reliable use.

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

Parameters3/5

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

The description includes an 'Args' section that names both parameters ('material_name' and 'object_name'), adding meaning beyond the input schema, which has 0% description coverage. However, it doesn't explain what constitutes valid names (e.g., format, existence requirements) or provide examples, so it only partially compensates for the schema gap.

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

Purpose4/5

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

The description clearly states the action ('apply a material') and the target ('to an object'), providing a specific verb+resource combination. However, it doesn't differentiate from sibling tools like 'apply_shader' or 'create_material', which could be related operations in a 3D modeling context.

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

Usage Guidelines2/5

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

No guidance is provided about when to use this tool versus alternatives. The description doesn't mention prerequisites (e.g., whether materials or objects must exist), context (e.g., scene editing vs. rendering), or exclusions (e.g., not for shaders or effects).

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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