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Blender Copilot MCP Server

by dwgx

select_object

Select an object in Blender and make it active. Optionally add to the current selection instead of replacing it.

Instructions

Select an object and make it active. If add=False (default), deselects all others first.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
addNo
nameYes
Behavior3/5

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

With no annotations, the description must carry the burden. It discloses that selection deselects others by default and that add=True allows additive selection. However, it does not cover error handling, behavior for invalid names, or return values.

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 very concise with two sentences, front-loading the core purpose. No unnecessary information; every part 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?

Given no annotations, no output schema, and low schema coverage, the description covers the basic selection behavior but lacks details on error handling, preconditions, or return values. It is adequate for a simple tool but not fully 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?

Schema description coverage is 0%. The description explains the effect of the add parameter (deselects others first) and implies name is the object to select. While it adds some meaning, it lacks details on valid values or formats.

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 selects an object and makes it active, with a specific verb and resource. It distinguishes from siblings by being the basic selection tool, and adds context about the add parameter.

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?

The description provides clear context for when to use the tool (to select an object) and explains the behavior of the add parameter. However, it does not mention when not to use it or alternative tools.

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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