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node-opcua-modeler-mcp-server

node-opcua-modeler-mcp-server

Official
by node-opcua
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TypeScript
Remote

opcua_model_reverse

Reverse-engineer NodeSet2.xml files into YAML DSL format to recreate or modify OPC UA models.

Instructions

Reverse-engineer a NodeSet2.xml file back into the YAML DSL format. Requires an API key (set OPCUA_MODELER_API_KEY env var). Optionally specify the target namespace URI to extract.

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": {
      "xml": "<xml>"
    },
    "name": "opcua_model_reverse"
  }
}

Input Schema

NameRequiredDescriptionDefault
xmlYesThe NodeSet2.xml content to reverse-engineer
namespace_uriNoTarget namespace URI to extract (auto-detected if omitted)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.3.0

TDQS

B3.2/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It mentions the API key requirement but does not disclose whether the tool is read-only, what side effects exist, or the exact output format (though it implies YAML). The behavioral traits are insufficiently specified.

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?

The description is concise with two sentences that cover purpose and prerequisites. It avoids fluff, but could be improved by structuring information (e.g., separating requirements from options) for better readability.

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?

With no output schema, the description should clarify the output format and potential errors. It states 'back into the YAML DSL format' which gives a hint, but lacks details about the exact return type or error handling. Adequate but not fully complete given the complexity.

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 description coverage is 100%, so the baseline is 3. The description's mention of the namespace_uri parameter ('Optionally specify the target namespace URI to extract') adds no new meaning beyond the schema's existing description. No extra value is provided.

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 verb 'reverse-engineer' and the resource 'NodeSet2.xml' with the output format 'YAML DSL'. However, it does not explicitly differentiate from sibling tools like 'opcua_model_generate' or 'opcua_model_create', which could cause confusion.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description mentions a prerequisite (API key) and an optional parameter, but does not provide explicit guidance on when to use this tool versus alternatives (e.g., 'Use this when you have an existing NodeSet2.xml to convert'). No when-not or exclusion criteria are given.

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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