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elemenopyunome

unreal-engine-mcp

set_actor_transform

Adjust an actor's location, rotation, or scale in Unreal Engine by specifying only the transform components to change.

Instructions

Move/rotate/scale an actor. Only the provided components change.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
locationNo
rotationNo
scaleNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations, the description bears full burden. It mentions incremental changes ('Only the provided components change') but lacks details on coordinate system, units, error behavior, or whether the transformation is absolute or relative.

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?

Two short sentences, no wasted words. Front-loaded with the action and a clarifying constraint.

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?

Despite an output schema existing (per context), the description omits essential context for a mutation tool: coordinate system, units, error handling, and examples. Incomplete for a 4-parameter tool.

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

Parameters2/5

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

Schema description coverage is 0%, and the description does not explain parameter types, ranges, or formats beyond stating 'components'. It adds little value over the raw schema.

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 tool moves/rotates/scales an actor, which is specific. However, it does not explicitly distinguish itself from the sibling tool 'set_actor_property', which might also modify transform components.

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 on when to use this tool versus siblings like set_actor_property or spawn_actor. No prerequisites or context for usage are provided.

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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