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elemenopyunome

unreal-engine-mcp

run_automation_tests

Launch headless editor to run Unreal Engine automation tests by filter, returning exit code and log tail.

Instructions

Run Automation Framework tests headlessly.

test_filter matches test names (empty runs all). Requires UE_PROJECT_PATH and UE_ENGINE_PATH. Returns exit code and a tail of the log. This launches a short-lived headless editor — it does not use the live editor connection.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
test_filterNo
timeout_secondsNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

With no annotations, description discloses key behaviors: launches headless editor, not persistent, requires env vars, returns exit code and log tail. Could mention side effects or error scenarios.

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?

Efficiently written with no wasted words. Front-loads main purpose and immediately provides key details.

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?

Covers return values, prerequisites, and behavioral constraints. However, missing detail on timeout parameter and error handling.

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?

Explains test_filter meaning but does not describe timeout_seconds. Schema coverage 0%, so description partially compensates.

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?

Clearly states 'Run Automation Framework tests headlessly' with specific verb and resource. Distinguishes from sibling tools like run_console_command or execute_python.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides usage context: requires environment variables, headless, short-lived, does not use live editor. Lacks explicit comparison to alternatives or when-not-to-use.

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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