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blender-mcp

blender-mcp

by kleer001
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

copy_modifiers

Transfer all modifiers from a source object to a target object in Blender, replicating the entire modifier stack to apply consistent effects.

Instructions

Copy all modifiers from source object to target object.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "source": "<source>",
      "target": "<target>"
    },
    "name": "copy_modifiers"
  }
}

Input Schema

NameRequiredDescriptionDefault
sourceYes
targetYes

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.2/5.0
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 does not explain whether existing modifiers on the target are preserved or overwritten, whether the source object's modifiers are removed (copy vs. move semantics), or what happens if source and target are the same. This lack of side-effect information is a significant gap.

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 a single, clear sentence with no redundant words. Every word earns its place, making it highly concise and well-structured.

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 lack of annotations and no output schema details, the description is incomplete. It does not mention return values, error conditions, or crucial side effects like how existing target modifiers are handled. This makes it insufficient for safe, confident use in a mutation tool, despite the tool's apparent simplicity.

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 input schema provides only parameter names ('source', 'target') as strings with no descriptions. The description adds the meaning that these refer to objects, which is helpful, but it does not specify the expected identifier format (e.g., name, path, UUID) or any constraints. Since schema coverage is 0%, the description partially compensates but remains underspecified.

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 action ('Copy all modifiers') and the resource ('from source object to target object'), with a specific verb and object scope. This distinguishes it from siblings like move_modifier, which implies relocation rather than duplication.

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 on when to use this tool versus alternatives such as move_modifier or add_modifier. The description only states what it does, leaving the agent to infer usage context without any explicit conditions or exclusions.

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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