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hedless

Onshape MCP Server

by hedless

create_assembly

Create a new assembly in an existing Onshape document using document ID, workspace ID, and assembly name.

Instructions

Create a new Assembly in an existing document

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYesName for the new Assembly
documentIdYesDocument ID
workspaceIdYesWorkspace ID
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It only states 'Create new Assembly' without discussing side effects, permissions, or what happens if an assembly already exists.

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?

One succinct sentence with no wasted words. While clear, it could be slightly improved by front-loading the key action.

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?

Given the lack of annotations and no output schema, the description is too sparse for a tool with multiple siblings. It does not explain return values, constraints, or how the assembly relates to the document.

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 covers all three parameters with descriptions. The tool description adds no additional meaning beyond what the schema already provides, so baseline of 3 is appropriate.

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 clearly states the action (create) and resource (Assembly) with the context (in an existing document). It distinguishes from siblings like create_document or create_part_studio, though it could be more specific about the assembly's role.

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?

No guidance on when to use this tool vs. alternatives such as add_assembly_instance or create_part_studio. No prerequisites or context provided.

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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