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CAD MCP Server

CAD MCP Server

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select_group

Retrieve all entities in a specified CAD group by group_id, so you can select and manage grouped objects.

Instructions

Return entities in a group.

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": {
      "group_id": "<group_id>"
    },
    "name": "select_group"
  }
}

Input Schema

NameRequiredDescriptionDefault
group_idYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.8/5.0
Behavior2/5

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

No annotations are provided, so the description carries full responsibility. It does not disclose whether the operation is read-only, whether the return is a list, or any side effects. 'Return entities' is thin for a query tool.

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?

A single short sentence that front-loads the core operation. It is minimal but not bloated.

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?

For a query tool with no annotations and no output schema, the description is incomplete: it omits return format, ordering, whether an empty group returns an empty list, and how it relates to group creation or ungrouping.

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 0% with only 1 required parameter. The description names the resource being selected by group_id, giving a semantic hint (it represents a group identifier) and implying that the return is the entities belonging to that group. Baseline 4 for zero params; here one param is nominally covered.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a verb (Return) and resource (entities in a group), which is somewhat clearer than a tautology, but does not distinguish it from siblings like list_entities or find_entities_by_layer. The scope is vague about whether it is a query or a selector.

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?

Provides no guidance on when to use this tool versus alternatives such as list_entities or get_entity_properties. The description leaves usage entirely implicit.

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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