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aadeshrao123

Unreal-MCP

by aadeshrao123

add_mapping_modifier

Add a modifier to a specific input mapping by specifying context path, mapping index, and modifier type. Modifier properties can be optionally defined.

Instructions

Add a modifier to a specific mapping in an Input Mapping Context.

Args: context_path: Path to the IMC asset mapping_index: Index of the mapping (from get_input_mapping_context) modifier_type: Modifier class name (e.g. "InputModifierNegate") properties: Optional modifier properties

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
propertiesNo
context_pathYes
mapping_indexYes
modifier_typeYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations provided, so the description must fully disclose behavior. It only states 'Add a modifier' without explaining side effects (e.g., whether it replaces existing modifiers, requires saving, or is idempotent). The behavioral impact is insufficiently described.

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

Conciseness4/5

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

Description is concise with a single paragraph and a docstring-style parameter list. No redundant information, but the parameter list could be more compact. Overall efficient.

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?

Has output schema but description does not mention return value or error handling. For a mutation tool, more context on success/failure signs would improve completeness. Adequate but not fully comprehensive.

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

Parameters4/5

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

Schema description coverage is 0%, but the description adds meaningful context for all 4 parameters: explains context_path as path to IMC asset, mapping_index as index from get_input_mapping_context, modifier_type with example, and properties as optional. Only minor vagueness on properties structure.

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?

Description clearly states the tool adds a modifier to a specific mapping in an Input Mapping Context. The verb 'Add' and resource 'modifier' are specific, and it distinguishes from siblings like remove_mapping_modifier and add_mapping_trigger.

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?

No explicit guidance on when to use this tool versus alternatives. The description implies the context (adding to a mapping), but does not specify prerequisites, when not to use, or mention sibling tools like add_mapping_trigger.

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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