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MCPBridge Server

by RBG-WebDesign
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TypeScript
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actor_spawn

Spawn an actor in Unreal Engine from an asset path at a specified location, rotation, and scale. Validates the transform to confirm correct placement.

Instructions

Spawn an actor from an asset path at a given location/rotation/scale. 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": {
      "asset_path": "<asset_path>"
    },
    "name": "actor_spawn"
  }
}

Input Schema

NameRequiredDescriptionDefault
nameNoActor label
scaleNoScale (default 1,1,1)
folderNoWorld Outliner folder
locationNoWorld location
rotationNoRotation
validateNoValidate resulting transform (default true)
asset_pathYesAsset path (e.g., /Game/Meshes/SM_Cube)

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 of behavioral disclosure. It adds that the tool returns validation results by default, which clarifies the validate parameter's effect, but it does not mention prerequisites, error behavior, or the actual world modification. The transparency is adequate but not rich.

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 two concise sentences, front-loaded with the primary action. There is no redundant or filler content.

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?

The tool has seven parameters including nested objects but no output schema or annotations. The description provides a high-level summary and mentions validation results, but it fails to clarify default transform values or the nature of validation output. Given the 100% schema coverage, it is minimally adequate but not fully complete.

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?

All seven parameters have descriptions in the schema, giving 100% coverage, so the baseline is 3. The description only references asset_path and location/rotation/scale generically without adding new semantic details beyond the 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 clearly states the tool spawns a single actor from an asset path with optional location, rotation, and scale. The verb 'Spawn' is specific and distinguishes this from sibling tools like actor_duplicate or level_actors.

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 this tool is for spawning a single actor, but it does not explicitly state when to prefer it over batch_spawn or mention exclusions. Usage context is implied rather than directly guided.

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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