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by RBG-WebDesign
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actor_duplicate

Duplicates an existing actor in Unreal Engine, optionally offsetting its position. Returns validation results by default.

Instructions

Duplicate an existing actor with an optional offset. Returns validation results by default.

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": {
      "actor_name": "<actor_name>"
    },
    "name": "actor_duplicate"
  }
}

Input Schema

NameRequiredDescriptionDefault
offsetNoOffset from original position
new_nameNoLabel for the duplicate
validateNoValidate resulting transform (default true)
actor_nameYesLabel of actor to duplicate

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.4.0

TDQS

A3.7/5.0
Behavior3/5

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

No annotations are provided, so the description carries the burden. It discloses that validation results are returned by default (useful given the validate parameter), but does not explain failure behavior, whether the original is modified, or permissions. It adds some transparency but not rich detail.

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?

One sentence, front-loaded with the action, no unnecessary words. Efficient and clear.

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 tool with 4 parameters and no output schema, the description is somewhat brief. It covers core purpose and default validation behavior, but lacks information about return results, edge cases, and relationship to sibling spawn/modify tools. Adequate but with gaps.

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 100%, so the schema already documents all parameters. The description adds only 'optional offset' which is already implied by the schema's required list. No additional semantic value beyond schema.

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 uses a specific verb ('Duplicate') and resource ('existing actor'), plus optional offset, making it distinct from sibling tools like actor_spawn, actor_delete, or actor_modify. It clearly states what the tool does.

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

Usage Guidelines3/5

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

The description implies the primary use case - duplicating an actor - but does not mention when to prefer this over alternatives such as actor_spawn or actor_modify, nor provides exclusions. The context is clear but not elaborated.

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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