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sam-david

unreal-mcp

by sam-david

add_blueprint_component

Specify a Blueprint asset path and component class to add a new component, with an optional name for the component.

Instructions

Add a component to a Blueprint.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
blueprint_pathYesBlueprint asset path
component_nameNoName for the component
component_classYesComponent class (e.g., StaticMeshComponent, BoxCollisionComponent, PointLightComponent)
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 only states the action without mentioning side effects (e.g., modification of the blueprint asset), persistence, or error conditions. This 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 sentence with no filler, front-loading the action and target. Maximum conciseness without sacrificing clarity.

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?

The tool has 3 parameters, no output schema, and no annotations. The description is too brief to cover prerequisites, behavior on failure, or relation to the blueprint asset (e.g., whether it saves or requires an open blueprint). It only communicates the core purpose.

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 baseline is 3. The description adds no parameter information beyond what the schema's property descriptions provide, but no deduction is needed since the schema is complete.

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 states a specific action ('Add a component') on a specific resource ('a Blueprint'), which clearly distinguishes from sibling tools like add_blueprint_variable and add_blueprint_function. The verb and object are unambiguous.

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, nor any prerequisites or exclusions. The tool name and description imply its use, but there is no explicit context or comparison to sibling tools.

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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