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Gamedev All-in-One MCP

by sansaks-jpg

Unity Set Gravity

unity_set_gravity

Set the global gravity vector for Unity Physics. Specify x, y, and z components to define the direction and strength of gravitational force.

Instructions

Set the global Physics gravity vector in Unity. Default is (0, -9.81, 0).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
xNoGravity X.
yNoGravity Y.
zNoGravity Z.
timeoutMsNoCommand timeout.
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. It only states the default value but fails to disclose side effects (e.g., affects all rigidbodies globally), whether changes are reversible, or if a scene must be loaded. More transparency is needed for a mutation tool.

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?

The description is a single sentence that is front-loaded with the core purpose. It is concise but could include one more sentence about behavior without becoming verbose. It earns its place.

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 4-parameter tool with no output schema and full schema coverage, the description is minimally adequate. However, it lacks context on the global scope and immediate effect, leaving some ambiguity.

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 coverage is 100% and each parameter has a description in the schema. The description repeats the default values already in the schema, adding no new semantic meaning beyond what the schema provides. Baseline score of 3 is appropriate.

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 clearly states the verb 'Set' and the specific resource 'global Physics gravity vector in Unity,' plus notes the default value. This distinguishes it from sibling tools like unity_apply_force and cross-engine set_gravity tools.

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 description gives no explicit guidance on when to use this tool versus alternatives. While the name implies it sets global gravity, there is no mention of when not to use it or any prerequisites, leaving the agent to infer usage context.

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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