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  3. OPC UA Modeler
OPC UA Modeler logo
Health: ActiveRecent health check succeeded.Last checked 9/7/2026, 11:07:29 PM

OPC UA Modeler

User RatingsBe the first to rate and review this MCP server! Enrichment pendingWe haven’t run our AI enrichment pass on this listing yet, so the overview, use cases, and FAQ below may be sparse or missing. We work through the catalog over time β€” check back soon.
View Repository1 GitHub StarsTotal stargazers on GitHub for the source repository (1 stars).Visit Website

OPC UA companion spec types, namespace dependencies, and engineering units for AI agents

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent β€” or use 1-click editor setup below.

Add to CursorAdd to VS Code
Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag β€” we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON β–Ύ

Client Config & Setup

Choose your client or environment
Target File:~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "opc-ua-modeler": {
      "command": "npx",
      "args": [
        "-y",
        "node-opcua-modeler-mcp-server"
      ]
    }
  }
}

πŸ’‘ Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Install Directory Badge Claim listing AlternativesπŸ’» More in Developer Tools

Documentation Overview

node-opcua-modeler-mcp-server

npm version npm downloads/month npm downloads total License: Apache-2.0 MCP

An MCP server that gives AI agents access to the OPC UA companion specification type system β€” 589 types across 22 industrial namespaces, plus 1,533 engineering units β€” and lets agents validate, generate, reverse-engineer, and create OPC UA information models.

Built on node-opcua, the most widely used OPC UA stack for Node.js.

Why?

When an AI agent needs to build an OPC UA information model, it must know:

  • What companion spec types exist (DI, Machinery, Robotics, Machine Tools…)
  • What components, properties, and methods each type has
  • What namespace dependencies are required
  • What engineering unit symbols are valid (UNECE Rec. 20)

This MCP server answers all of those questions β€” offline, for free, in milliseconds.

Quick Start

With Claude Desktop

Add to your claude_desktop_config.json:

config.json
{
  "mcpServers": {
    "opcua-modeler": {
      "command": "npx",
      "args": ["-y", "node-opcua-modeler-mcp-server"],
      "env": {
        "OPCUA_MODELER_API_KEY": "stfv_your_api_key_here"
      }
    }
  }
}

Note: The API key is optional for discovery tools (offline) and opcua_model_validate (50 anonymous calls/day). It is required for opcua_model_generate, opcua_model_reverse, and opcua_model_create. Register at opcua-modeler.sterfive.io and create a key under Settings β†’ API β€” the free tier gives 25 calls/day for 90 days; see pricing for paid plans.

With any MCP client

Terminal
npx node-opcua-modeler-mcp-server

The server communicates over stdio using the Model Context Protocol.

Using a local backend instead of the hosted API

If you run the OPC UA Modeler CLI on the same machine, the model tools can be served from it instead of the hosted API β€” your YAML never leaves the host.

Start the server (requires a licence that includes the serve entitlement):

bash
opcua-modeler serve

Then set one environment variable in your MCP client config:

config.json
{
  "mcpServers": {
    "opcua-modeler": {
      "command": "npx",
      "args": ["-y", "node-opcua-modeler-mcp-server"],
      "env": {
        "OPCUA_MODELER_BACKEND": "local"
      }
    }
  }
}

No API key is needed in this mode β€” the client discovers the local endpoint and its credentials automatically.

VariableValuesPurpose
OPCUA_MODELER_BACKENDcloud (default), localWhich backend serves the model tools
OPCUA_MODELER_API_KEYstfv_…API key, cloud backend only
OPCUA_MODELER_API_URLURLOverride the hosted API base URL

Notes

  • The two backends are never mixed, and there is no fallback between them. If local is selected and no server is running, the call fails with instructions rather than silently sending your model to the hosted API.
  • The seven discovery tools are local to this package and work offline on either setting.
  • opcua_model_create (AI generation) is available on the cloud backend only.

Tools

list_namespaces

List all 25 OPC UA companion spec namespaces with aliases, URIs, and dependencies.

Code
β†’ list_namespaces()
← [
    { "alias": "di", "name": "OPC UA for Devices", "uri": "http://opcfoundation.org/UA/DI/", "dependencies": [] },
    { "alias": "robotics", "name": "OPC UA for Robotics", "uri": "http://opcfoundation.org/UA/Robotics/", "dependencies": ["di", "ia"] },
    ...
  ]

resolve_dependencies

Resolve the full dependency chain for companion spec aliases. Returns a topologically sorted list for the YAML namespaces: block.

Code
β†’ resolve_dependencies({ aliases: ["machineTool"] })
← ["di", "ia", "machinery", "isa95JobControl", "machineryJobs", "machineTool"]

list_types

List all ObjectTypes and VariableTypes defined in a companion spec namespace.

Code
β†’ list_types({ alias: "robotics" })
← [
    { "browseName": "MotionDeviceType", "kind": "ObjectType", "subtypeOf": "di:ComponentType", ... },
    { "browseName": "AxisType", "kind": "ObjectType", "subtypeOf": "di:ComponentType", ... },
    ...
  ]   // 25 types

get_type_details

Get the full structure of a type β€” components, properties, methods, interfaces, including inherited members.

Code
β†’ get_type_details({ alias: "robotics", browseName: "MotionDeviceType" })
← {
    "browseName": "MotionDeviceType",
    "kind": "ObjectType",
    "subtypeOf": "di:ComponentType",
    "interfaces": ["di:IVendorNameplateType", "di:ITagNameplateType"],
    "components": [
      { "browseName": "robotics:Axes", "nodeClass": "Object", "typeDefinition": "FolderType", "modellingRule": "Mandatory" },
      { "browseName": "robotics:PowerTrains", "nodeClass": "Object", "typeDefinition": "FolderType", "modellingRule": "Mandatory" },
      ...
    ],
    "properties": [
      { "browseName": "di:Manufacturer", "dataType": "LocalizedText", "modellingRule": "Mandatory" },
      { "browseName": "robotics:MotionDeviceCategory", "dataType": "MotionDeviceCategoryEnumeration", "modellingRule": "Mandatory" },
      ...
    ]
  }

search_types

Search for types across all companion specs by keyword.

Code
β†’ search_types({ query: "temperature" })
← [
    { "alias": "glass", "browseName": "MotorTemperatureTooHighEventType", ... },
    { "alias": "padim", "browseName": "TemperatureMeasurementVariableType", ... },
    { "alias": "amb", "browseName": "OverTemperatureConditionClassType", ... }
  ]

find_engineering_unit

Find the official UNECE Rec. 20 engineering unit symbol. Supports fuzzy matching and natural language aliases.

Code
β†’ find_engineering_unit({ query: "celsius" })
← { "symbol": "Β°C", "matchType": "alias", "confidence": 1 }

β†’ find_engineering_unit({ query: "revolutions per minute" })
← { "symbol": "r/min", "matchType": "alias", "confidence": 1 }

β†’ find_engineering_unit({ query: "bar" })
← { "symbol": "bar", "matchType": "exact", "confidence": 1 }

opcua_model_validate ☁️

Validate an OPC UA YAML model for correctness. Returns diagnostics with severity, codes, messages, and line numbers. Works without an API key (limited to 5 calls/day).

Code
β†’ opcua_model_validate({ yaml: "namespaces:\n  di:\n..." })
← {
    "valid": true,
    "diagnostics": [
      { "severity": "warning", "code": "W001", "message": "...", "line": 42 }
    ]
  }

opcua_model_generate ☁️

Generate OPC UA NodeSet2.xml and Symbols.CSV from a validated YAML model. Returns base64-encoded artifacts. Requires an API key.

Code
β†’ opcua_model_generate({ yaml: "namespaces:\n  di:\n...", include_docs: false })
← {
    "valid": true,
    "artifacts": {
      "nodeset2_xml": "PD94bWwg...",
      "symbols_csv": "bmFtZSxu..."
    },
    "diagnostics": []
  }

opcua_model_reverse ☁️

Reverse-engineer a NodeSet2.xml file back into the YAML DSL format. Requires an API key.

Code
β†’ opcua_model_reverse({ xml: "<?xml version=..." })
← {
    "yaml": "namespaces:\n  di:\n...",
    "diagnostics": []
  }

opcua_model_create ☁️

Generate an OPC UA YAML model from a natural language description using AI. The AI will auto-detect relevant companion specs, generate a validated model with documentation, and auto-correct validation errors. Requires an API key.

Code
β†’ opcua_model_create({ prompt: "A robotic welding cell with two robot arms, each having 6 axes, temperature monitoring on each motor" })
← {
    "success": true,
    "yaml": "namespaces:\n  di:\n  robotics:\n...",
    "attempts": 2,
    "diagnostics": [],
    "model": "gemini-2.5-pro",
    "tokens": { "input": 4200, "output": 1800 }
  }

β†’ opcua_model_create({ prompt: "A CNC lathe with spindle speed and temperature", forceSpecs: ["di", "cnc"] })
← {
    "success": true,
    "yaml": "namespaces:\n  di:\n  cnc:\n...",
    "attempts": 1,
    "diagnostics": [],
    "model": "gemini-2.5-pro",
    "tokens": { "input": 3500, "output": 1200 }
  }

Coverage

Companion Specifications (25)

AliasSpecificationTypes
padimOPC UA for PA-DIM101
ijtBaseOPC UA for IJT Base65
machineToolOPC UA for Machine Tools63
diOPC UA for Devices44
glassOPC UA for Glass Manufacturing36
machineVisionOPC UA for Machine Vision36
adiOPC UA for Analyzer Devices35
commercialKitchenEquipmentOPC UA for Commercial Kitchen Equipment35
roboticsOPC UA for Robotics25
iaOPC UA for Industrial Automation20
ambOPC UA for AMB18
autoIdOPC UA for AutoID18
metalFormingOPC UA for Metal Forming16
machineryOPC UA for Machinery15
gdsOPC UA GDS14
woodworkingOPC UA for Woodworking13
cncOPC UA for CNC Systems12
…and 5 more
Total22 namespaces589 types

Engineering Units

1,533 official UNECE Rec. 20 symbols plus 134 natural language aliases (e.g., "celsius" β†’ Β°C, "revolutions per minute" β†’ r/min). Every alias resolves to a symbol the modeler engine accepts β€” the lookup never invents one.

Read the full README β†’View source on GitHub β†’

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Frequently Asked Questions about OPC UA Modeler

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "opc-ua-modeler": { "command": "npx", "args": ["-y", "OPC UA Modeler"] } }

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Technical Specs & Signals

CategoryπŸ’»Developer Tools
More technical detailsExpand β–Ύ
TransportSTDIO
RuntimeNode.js
Last updatedSep 7, 2026
Views0
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GitHub stars1
GitHub Star CountTotal stargazers on GitHub representing community popularity (1 stars).
36Quality signal: Fair Β· 36/100How this signal is calculated β–Ύ
Server availabilityNot measured

Not scored for repo-hosted servers β€” we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20
Documentation & tools16/30
Adoption & activity1/15
Community engagement0/10

A guidance signal from public completeness & health data β€” not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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