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Blender Copilot MCP Server

by dwgx

create_circular_array

Generate circular copies of an object around a pivot using an empty, with control over count, axis, and radius.

Instructions

Create a circular array using an empty as rotation pivot. Count = number of copies around the circle. Axis: X, Y, or Z. Radius offsets the object from the pivot center.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
axisNoZ
nameYes
countNo
radiusNo
Behavior2/5

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

No annotations are provided, so the description fully bears the burden. It states 'create' but does not disclose side effects (e.g., does it modify existing objects or create new ones?), error conditions, or what happens if no empty is selected. The behavioral description is minimal.

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 extremely concise (3 sentences) and front-loaded with the main action. Every sentence adds value, no wasted words.

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?

There is no output schema, so the description should explain what the tool returns (e.g., the array object). It also lacks context about required selections (e.g., active object) and error handling. For a 4-parameter creation tool, this is incomplete.

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 description adds meaning for 3 of 4 parameters (count, axis, radius) beyond the schema, but omits the required 'name' parameter. With 0% schema description coverage, the description should cover all parameters, but it does not fully do so.

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 tool creates a circular array using an empty as pivot. It distinguishes from sibling 'create_array' (likely linear) by specifying 'circular' and the pivot mechanism.

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 explains parameter usage (count, axis, radius) but does not provide when-to-use or when-not-to-use guidance, nor does it reference alternatives like create_array. It lacks prerequisites (e.g., need an empty) and exclusionary criteria.

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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