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node-opcua-modeler-mcp-server

node-opcua-modeler-mcp-server

Official
by node-opcua
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Remote

find_engineering_unit

Look up the official UNECE Rec. 20 engineering unit symbol for any unit description. Always verify before specifying a unit in industrial modeling to avoid errors.

Instructions

Find the official UNECE Rec. 20 engineering unit symbol for a given description. ALWAYS call this before using any engineering unit — NEVER guess unit symbols.

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": {
      "query": "<query>"
    },
    "name": "find_engineering_unit"
  }
}

Input Schema

NameRequiredDescriptionDefault
queryYesDescription or common name of the unit (e.g. "revolutions per minute", "celsius", "pressure bar")

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.3.0

TDQS

A3.8/5.0
Behavior2/5

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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. However, it does not mention any behavioral traits such as idempotency, side effects, error handling, or what happens if the query is not found. This lack of transparency could leave the agent uncertain about the tool's behavior.

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 extremely concise with two sentences that convey purpose and usage guideline without any unnecessary words. Every sentence earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (single parameter, no output schema, no nested objects), the description is fairly complete. It explains the tool's purpose and usage context. However, it does not describe the return format or potential error scenarios, but for a lookup tool, this is acceptable.

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?

The input schema has 100% description coverage for the single parameter 'query'. The tool description adds value by repeating that it's a description or common name, but this does not significantly extend beyond the schema. Baseline 3 is appropriate.

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's function: finding the official UNECE Rec. 20 engineering unit symbol for a given description. It uses the specific verb 'find' and resource 'official engineering unit symbol', and distinguishes itself from sibling tools which are about modeling and types, not unit lookup.

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 includes an explicit imperative: 'ALWAYS call this before using any engineering unit — NEVER guess unit symbols.' This provides clear guidance on when to use the tool, though it does not mention alternatives or when not to use it.

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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