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add_checkbox_to_widget

Add a checkbox widget for boolean toggles in Unreal Engine menus. Specify the widget blueprint, checkbox name, label, position, and initial state to create interactive toggle controls.

Instructions

Add a Checkbox widget for boolean toggles in menus.

Args: widget_name: Widget Blueprint name checkbox_name: Component name label_text: Optional label text next to the checkbox position: [X, Y] position is_checked: Initial checked state

KB: see knowledge_base/06_UI_UMG_SYSTEMS.md#overview Example: add_checkbox_to_widget(widget_name="/Game/MCP_Test/WBP_Example", checkbox_name="ExampleName")

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
positionNo
is_checkedNo
label_textNo
widget_nameYes
checkbox_nameYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A3.9/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It states the action but does not reveal side effects such as whether the widget blueprint is modified, saved, or compiled, whether the operation can fail, or what happens to existing widget content. For a mutation tool, this is a significant transparency 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 compact and well-structured: a one-sentence purpose, an Args block that adds semantic value, a KB reference, and a minimal example. There is no filler or redundant repetition of schema information.

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

Completeness4/5

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

All parameter semantics are covered, an example call is provided, a KB link gives deeper context, and an output schema exists. The main gap is the lack of behavioral/side-effect disclosure and explicit sibling differentiation, but these are partially mitigated by the example and schema presence.

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

Parameters5/5

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

Schema description coverage is 0%, but the Args block fully compensates by explaining every parameter in plain language, including widget_name, checkbox_name, label_text, position, and is_checked. This goes beyond the schema, which only provides names, types, and defaults.

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 opens with 'Add a Checkbox widget for boolean toggles in menus,' which names a specific verb, a concrete resource, and an explicit purpose. This makes it clearly distinguishable from sibling widget-adders like add_button_to_widget or add_text_block_to_widget without needing to compare schemas.

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 phrase 'for boolean toggles in menus' implies when the tool is appropriate, and the example demonstrates a realistic call. However, there is no explicit guidance about when not to use it or how it compares to sibling add_*_to_widget tools, leaving selection partly to inference.

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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