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hedless

Onshape MCP Server

by hedless

get_variables

Retrieve all variables from a Part Studio variable table by providing document, workspace, and element IDs.

Instructions

Get all variables from a Part Studio variable table

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
elementIdYesPart Studio element ID
documentIdYesDocument ID
workspaceIdYesWorkspace ID
Behavior2/5

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

No annotations are provided, and the description only states the action without disclosing behavioral traits like read-only nature, return format, or any side effects. The minimal description fails to add value beyond the obvious.

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?

Very concise, single sentence with no wasted words. Front-loaded with the core action and resource.

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?

The tool is simple with 3 required parameters and no output schema. The description is minimal but sufficient for a basic read operation, though it could be more complete by mentioning the return structure or scope (e.g., 'from a Part Studio element's variable table').

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%, so the baseline is 3. The description does not add any extra meaning to the parameters beyond what the schema already provides.

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 uses a specific verb 'Get' and resource 'all variables from a Part Studio variable table', clearly distinguishing it from sibling 'set_variable' which performs the write operation.

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?

The description does not provide any guidance on when to use this tool versus alternatives, such as when to read vs write variables, or mention any prerequisites or 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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