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sam-david

unreal-mcp

by sam-david

build_plugin

Compile an Unreal Engine plugin into a standalone build. Provide the .uplugin path and output directory, with an optional target platform.

Instructions

Build a plugin standalone.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
platformNoTarget platform
output_pathYesOutput directory for the built plugin
plugin_pathYesPath to the .uplugin file
Behavior1/5

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. 'Build a plugin standalone' gives no information about side effects, environment requirements, output generation, or whether the operation is destructive.

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

Conciseness3/5

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

The description is very short and contains no unnecessary words, but the phrasing 'Build a plugin standalone' is awkward and underspecified. It is concise but not well-structured or sufficiently informative.

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?

For a build tool with three parameters, no output schema, and no annotations, the description leaves significant gaps: it doesn't explain what 'standalone' means, the role of 'platform', or what the build output is. Sibling build tools add confusion without further context.

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% with clear descriptions for all three parameters, so the baseline is 3. The description adds no extra meaning beyond the schema, which is acceptable given the high schema coverage.

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 uses 'Build' with 'plugin' as the resource, which is specific and distinguishes from sibling tools like build_target or package_project. However, 'standalone' is ambiguous—it could mean building the plugin in standalone mode or building a standalone plugin—so it's not perfectly clear.

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?

There is no guidance on when to use this tool versus alternatives such as build_target, build_cook_run, or package_project. No prerequisites, exclusions, or alternative tools are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Install Server

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