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sam-david

unreal-mcp

by sam-david

generate_lightmap_uvs

Generate lightmap UVs for static meshes to enable proper light baking. Provide the mesh path to create UVs.

Instructions

Generate lightmap UVs for a static mesh.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
mesh_pathYesStatic mesh asset path
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 disclosing side effects. It simply states the action without clarifying whether the static mesh is modified or saved, whether the operation is reversible, or what context is required.

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, front-loaded sentence that conveys the core purpose with no filler or redundancy. It is appropriately concise for a tool with one parameter.

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?

For a simple one-parameter tool, the description is minimally coherent, but it lacks behavioral context and usage guidance. The schema covers the parameter well, yet the description does not fully explain the operation's effect or output, so it is adequate but not 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?

The input schema has 100% coverage and clearly describes mesh_path as the 'Static mesh asset path', so the description adds little beyond what the schema already provides. Baseline 3 is appropriate because the schema does the heavy lifting.

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 uses a specific verb ('Generate') and a clear resource ('lightmap UVs for a static mesh'), making the tool's purpose unmistakable. It also distinguishes itself from sibling tools like generate_lods and generate_collision by targeting UV generation specifically.

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. The description only states what the tool does, with no mention of prerequisites, typical use cases, or exclusions.

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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