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OPC UA Modeler MCP Server

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OPC UA Modeler is answering right now. Last checked moments ago. 117 installs a week from npm. It exposes 12 tools. Last commit 23 Oct 2026.

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

Installs per day peak 24 · avg 11 · -36% w/w
a month agotoday
Uptime history 73 days of history · worst day 99%
73 days agonow
100.0%
Uptime 24h
92 of 92 checks
12
Tools
read from the server
267 ms
Response time
average over 24h
117
Installs / week
npm and PyPI

What changed 5

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 10 September 2026. No other catalogue keeps this.

21 Oct a tool changed version
20 Oct a tool description was rewritten opcua_model_generate
20 Oct a tool changed the parameters it asks for opcua_model_generate
21 Sep a tool description was rewritten get_type_details
10 Sep a tool changed the parameters it asks for opcua_model_reverse

What the code does

We read the source, 7 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable src/generate.ts:93 
    symbols: path.join(dir, path.basename(pairedSymbolsFile(modelFile, true)))

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 0 min ago.

run in your terminal
claude mcp add node-opcua-modeler-mcp-server --transport http https://api.opcua-modeler.sterfive.io/api/mcp
Settings → Connectors → Add custom connector, then paste this address
https://api.opcua-modeler.sterfive.io/api/mcp
~/.codex/config.toml
[mcp_servers.node-opcua-modeler-mcp-server]
url = "https://api.opcua-modeler.sterfive.io/api/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "node-opcua-modeler-mcp-server": {
      "url": "https://api.opcua-modeler.sterfive.io/api/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "node-opcua-modeler-mcp-server": {
      "type": "http",
      "url": "https://api.opcua-modeler.sterfive.io/api/mcp"
    }
  }
}

Available tools 12

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

opcua
opcua_model_create
Generate an OPC UA YAML model from a natural language description using AI. Requires an API key (set OPCUA_MODELER_API_KEY env var). The AI will auto-detect relevant companion specs, generate a validated model with documentation, and auto-correct validation errors.
opcua_model_generate
Generate OPC UA NodeSet2.xml and the symbols CSV from a YAML model. Requires an API key (set OPCUA_MODELER_API_KEY env var). NodeIds stay stable only if each regeneration passes back the symbols of the previous one: pass symbols_csv, or mode "new" for a first generation, or mode "renumber" to change ids on purpose. A call with none of these is refused with SYMBOLS_DECISION_REQUIRED. Returns base64-encoded artifacts if the model is valid. The result lists symbol counts (reused/new/dropped), hints and next steps.
opcua_model_reverse
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.
opcua_model_validate
Validate an OPC UA YAML model for correctness. Returns diagnostics with severity (error/warning/info), codes, messages, and line numbers. Works without an API key (limited to 50 calls/day). ALWAYS validate before generating.
types
list_types
List ALL ObjectTypes, VariableTypes, and InterfaceTypes defined in a specific companion spec namespace. ALWAYS call this before using any type from a namespace — NEVER guess type names.
search_types
Search for types across ALL companion specs by keyword. Use this when you don't know which namespace defines a type. Returns matching types with their namespace alias.
dsl
get_dsl_reference
Get the grammar reference for the OPC UA modeler YAML DSL: file header, top-level sections, name-prefix conventions, minimal examples, and common mistakes. Call this FIRST before writing any YAML model by hand. Works without an API key.
engineering
find_engineering_unit
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.
namespaces
list_namespaces
List all well-known OPC UA companion spec namespace aliases with their full names, URIs, and dependencies. Use this to discover what namespaces are available.
resolve
resolve_dependencies
Given one or more companion spec namespace aliases, returns the full resolved dependency list that MUST go in the YAML `namespaces:` section. Always call this before generating the namespaces block.
reusable
find_reusable_block
Find reusable Interfaces / AddIns by capability — pass a member name or keyword (e.g. "SerialNumber", "DeviceHealth", "Location") and get the standard blocks that already expose it. PREFER applying/composing an existing block over redefining its members inline. Interfaces are applied with `interfaces:`; addins (types with a DefaultInstanceBrowseName) are composed with `addIns:`. A single property → use the Interface; a whole named sub-object → use the AddIn.
type
get_type_details
Get detailed information about a specific type: its components, properties, methods, interfaces, and optional members. Use this to understand a type's structure before creating instances or subtypes. `specRef`, on the type and on a member, is the link to the section of the specification that defines it: cite it.

Endpoints

URLTransportStateLatencyChecked
https://api.opcua-modeler.sterfive.io/api/mcp streamable-http answering 285 ms 0 min ago

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OPC UA Modeler — questions

Answers built from our own checks of this server.

What can OPC UA Modeler do?
It exposes 12 tools, read directly from the server on our last check. Among them: find_engineering_unit, find_reusable_block, get_dsl_reference, get_type_details, list_namespaces, list_types and 6 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
What is OPC UA Modeler mostly used for?
Its tools cluster around opcua and types. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.
Is OPC UA Modeler working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 267 ms. The bar chart above shows every period we have measured.
How do I connect OPC UA Modeler?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does OPC UA Modeler need an API key?
No. OPC UA Modeler completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 12 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is OPC UA Modeler?
It answers our handshake in 267 ms on average, which is faster than 53% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use OPC UA Modeler?
The npm package node-opcua-modeler-mcp-server was installed 117 times in the last week. Week over week that is -36%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is OPC UA Modeler open source?
The code is open source: it is published under the Apache-2.0 licence, written in TypeScript and 2 stars on GitHub. The licence covers the code in the repository, not the hosted service at api.opcua-modeler.sterfive.io, which runs on its operator's own terms.