OPC UA Modeler MCP Server
An MCP server that gives AI agents access to the OPC UA companion specification type system - 764 types across 30 industrial namespaces, plus 1,533 engineering units - and lets agents validate, generate, reverse-engineer, and create OPC UA information models. Its 7 documented tools cluster into read & search, resolve.
People who work with Opcua and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.
VERIFIED ACTIVE
LAST COMMIT 2026-09-21 · ★ 2 · #126 OF 241 MAINTAINED AUTOMATION · VERIFIED 2026-09-30
Apache-2.0 · TypeScript servers · how we verify → /methodology
01 · Install OPC UA Modeler
before you install - you'll need
Set OPCUA_MODELER_API_KEY before connecting. OPCUA_MODELER_BACKEND is optional or environment-specific per the README.
Claude Code
claude mcp add node-opcua-node-opcua-modeler-mcp-server --transport http https://api.opcua-modeler.sterfive.io/api/mcpClaude Desktop / Cursor / VS Code - add to config
{
"mcpServers": {
"node-opcua-node-opcua-modeler-mcp-server": {
"url": "https://api.opcua-modeler.sterfive.io/api/mcp"
}
}
}Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.
Using another client? Same JSON, different key
Claude Desktop · mcpServers
Cursor · mcpServers
VS Code · servers
Windsurf · mcpServers
Zed · context_servers
Cline · mcpServers
Roo Code · mcpServers
Continue · mcpServers
LibreChat · mcpServers
Gemini CLI · mcpServers
Codex CLI · mcp_servers
Full setup guides: every client.
02 · Evidence
https://api.opcua-modeler.sterfive.io/api/mcp
transport: streamable-http
endpoint alive - responded to MCP initialize · probed 2026-09-30
Security posture
What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.
runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to api.opcua-modeler.sterfive.io
endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect
license Apache-2.0 - declared in the repository
npm package node-opcua-modeler-mcp-server - unscoped; check the name against the project README before installing
registry namespace io.github.node-opcua is GitHub-verified and matches the repo owner
03 · What OPC UA Modeler can do
Prose above is summarized from the project's README and registry record - no invented capabilities.
What you can build
With this server connected, an agent can list all 30 OPC UA companion spec namespaces with aliases, URIs, and dependencies, resolve the full dependency chain for companion spec aliases. Returns a topologically sorted list for the YAML namespaces: block, list all ObjectTypes and VariableTypes defined in a companion spec namespace, and get the full structure of a type - components, properties, methods, interfaces, including inherited members.
Capability map
Tools grouped from the project's README - what OPC UA Modeler lets an agent do.
read & search
6 tools - e.g. List all 30 OPC UA companion spec namespaces with aliases, URIs, and dependencies.; List all ObjectTypes and VariableTypes defined in a companion spec namespace.; Get the full structure of a type…
list_namespaces · list_types · get_type_details · search_types · find_reusable_block · find_engineering_unit
Resolve
1 tool - e.g. Resolve the full dependency chain for companion spec aliases. Returns a topologically sorted list for the YAML namespaces: block.
resolve_dependencies
04 · Who maintains OPC UA Modeler
OPC UA Modeler is maintained by node-opcua. It's the only MCP server we track from this author; the repo dates to Jun 2026.
05 · Facts
- category
- automation - ranked #126 of 241 actively-maintained automation servers as of 2026-09-30.
- registry
- io.github.node-opcua/node-opcua-modeler-mcp-server (active, first published 2026-06-25 · 10 versions)
- packages
- npm:node-opcua-modeler-mcp-server
06 · OPC UA Modeler FAQ
Is OPC UA Modeler still maintained?
Yes - as of 2026-09-30, its last commit was 2026-09-21. We re-verify nightly.
What can OPC UA Modeler do?
With this server connected, an agent can list all 30 OPC UA companion spec namespaces with aliases, URIs, and dependencies, resolve the full dependency chain for companion spec aliases. Returns a topologically sorted list for the YAML namespaces: block, list all ObjectTypes and VariableTypes defined in a companion spec namespace, and get the full structure of a type - components, properties, methods, interfaces, including inherited members.
How do I install OPC UA Modeler?
Run `npx -y node-opcua-modeler-mcp-server`. The README documents 2 environment variables (OPCUA_MODELER_API_KEY, OPCUA_MODELER_BACKEND) to set first. Set OPCUA_MODELER_API_KEY before connecting. OPCUA_MODELER_BACKEND is optional or environment-specific per the README. You can also paste the ready-made client config above.
Does OPC UA Modeler require authentication?
No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-09-30; you can connect without credentials.
07 · Alternatives to OPC UA Modeler
Alternatives to OPC UA Modeler
Maintained automation servers if OPC UA Modeler isn't the fit.
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- Excel MCP Server Create, read and edit Excel workbooks without Microsoft Excel. ★ 4,205 · 2026-09-28
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