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apply_dynamics

Add rigid or soft body dynamics to 3D objects in Cinema 4D for realistic physical simulations and animations.

Instructions

Add dynamics (rigid or soft) to the specified object.

Args:
    object_name: Name of the object to apply dynamics to
    dynamics_type: Type of dynamics to apply (rigid, soft)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
object_nameYes
dynamics_typeYes

Implementation Reference

  • The apply_dynamics tool handler function.
    @mcp.tool()
    async def apply_dynamics(
        object_name: str, dynamics_type: str, ctx: Context = None
    ) -> str:
        """
        Add dynamics (rigid or soft) to the specified object.
    
        Args:
            object_name: Name of the object to apply dynamics to
            dynamics_type: Type of dynamics to apply (rigid, soft)
        """
        async with c4d_connection_context() as connection:
            if not connection.connected:
                return "❌ Not connected to Cinema 4D"
    
            response = send_to_c4d(
                connection,
                {
                    "command": "apply_dynamics",
                    "object_name": object_name,
                    "type": dynamics_type,
                },
            )
            return format_c4d_response(response, "apply_dynamics")
Behavior2/5

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

With no annotations provided, the description carries full burden but offers minimal behavioral insight. It implies a write operation ('Add') but doesn't disclose permissions needed, whether changes are reversible, side effects on the object, or error conditions. This is inadequate for a mutation tool with zero annotation coverage.

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, followed by parameter explanations. There's no wasted text, though it could be more structured (e.g., bullet points). Every sentence adds value, making it efficient.

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?

For a mutation tool with no annotations, no output schema, and low schema coverage, the description is insufficient. It doesn't explain what 'dynamics' entail, the result of application, error handling, or integration with sibling tools. More context is needed for safe and effective 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?

Schema description coverage is 0%, so the schema provides no parameter descriptions. The description adds basic semantics by explaining 'object_name' as 'Name of the object to apply dynamics to' and 'dynamics_type' with examples ('rigid, soft'), but lacks details like format constraints or valid values beyond the two examples. It partially compensates but not fully.

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 ('Add dynamics') and target ('to the specified object'), with specific dynamics types mentioned. It distinguishes from siblings like 'create_soft_body' or 'modify_object' by focusing on dynamics application rather than creation or general modification. However, it doesn't explicitly differentiate from all potential overlapping tools.

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 like 'create_soft_body' or 'modify_object'. The description lacks context about prerequisites (e.g., object must exist), exclusions, or typical scenarios for applying dynamics versus other operations.

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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