Fusion360 Live MCP

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Create Torus

create_torus

Create a non-parametric torus primitive for Fusion 360 models by setting major and minor radii, center coordinates, and axis; units are cm and degrees.

Instructions

Create a torus primitive (non-parametric via TemporaryBRepManager) Unless a parameter says otherwise, lengths and coordinates are in cm (not mm) and angles in degrees.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "major_radius": "<major_radius>",
      "minor_radius": "<minor_radius>"
    },
    "name": "create_torus"
  }
}

Input Schema

Name	Required	Description	Default
`axis`	No		z
`center_x`	No
`center_y`	No
`center_z`	No
`major_radius`	Yes	Distance from center to tube center
`minor_radius`	Yes	Tube cross-section radius

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Sep 30, 2026

TDQS

A3.6/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=false, idempotentHint=false, and destructiveHint=false, so the safety profile is covered. The description adds meaningful behavioral context beyond annotations by stating that the torus is non-parametric via TemporaryBRepManager and that lengths/coordinates default to cm and angles to degrees.

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 definition is two sentences with no wasted words. The purpose is front-loaded, followed immediately by the unit caveat, making it easy to parse despite a minor punctuation gap.

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 primitive-creation tool with annotations and no output schema, the description covers purpose, method, and units adequately. However, it omits side-effect context such as whether it adds a new body to the active design and does not route the agent among similar creation tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is low at 33%, with only major_radius and minor_radius documented in the schema. The description compensates by specifying the critical unit convention for lengths, coordinates, and angles, which is absent from the schema and affects most numeric parameters.

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 states a specific verb and resource: "Create a torus primitive." The parenthetical "non-parametric via TemporaryBRepManager" clarifies the creation method and distinguishes it from parametric primitive creators such as create_box_parametric, though no sibling is named explicitly.

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 like create_sphere, create_cylinder, or parametric creation tools. Usage is only implied by the tool name: call it when a torus primitive is needed.

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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