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aadeshrao123

Unreal-MCP

by aadeshrao123

create_blueprint_function

Create a new function within a specified Unreal Engine Blueprint, defining its name and optional return type to extend Blueprint logic.

Instructions

Create a new function in a Blueprint.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
return_typeNovoid
function_nameYes
blueprint_nameYes

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 must disclose behaviors. It only states 'Create' implying mutation, but fails to mention side effects, permissions, or any constraints beyond the schema. The burden of transparency is not met.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness2/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise at one sentence, but it sacrifices necessary information. It is under-specified rather than efficiently compact, leading to poor usability.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the complexity of creating a blueprint function and the presence of an output schema, the description lacks any context about prerequisites, return values, or how it fits into the Blueprint workflow. It is inadequate.

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

Parameters1/5

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

Schema description coverage is 0%, and the description provides no information about the parameters (blueprint_name, function_name, return_type). The agent must infer meanings from names alone, which is insufficient for correct invocation.

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 verb 'Create' and the resource 'function in a Blueprint', providing a specific action and object. However, it does not differentiate from sibling tools like 'create_blueprint_variable' or 'add_blueprint_node', which could confuse the agent about the exact purpose.

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 'add_function_input' or 'create_blueprint_variable'. The agent lacks context for proper selection and may misuse the tool.

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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