OPC UA MCP Server

01 · What it does

• Read and browse OPC UA nodes, with data type, status, timestamps and units
• Read history and aggregates, and event history where the server supports it
• Subscribe to nodes and events, and list active alarms
• Read-only by default; writes and method calls need the operator profile, an allowlist and a verified server
• Audit file of every control call. Same 15 tools in Python and Node

02 · Install

$ claude mcp add opcua -e OPCUA_SERVER_URL=opc.tcp://localhost:4840 -- npx -y opcua-mcp-server

1. Replace opc.tcp://localhost:4840 with your endpoint. Python runtime: swap npx -y opcua-mcp-server for uvx opcua-mcp-server
2. Claude Desktop: a one-file .mcpb bundle on the releases page, or opcua-mcp-server --install claude-desktop --url ... --dry-run
3. Try it without a plant: the repo ships a mock OPC UA server (uv sync --all-packages, then uv run --no-sync opcua-mock-server)
4. README warning: the default channel is unencrypted and anonymous; secure it and pin the server certificate before real equipment
5. One process talks to one endpoint, so add one entry per PLC

03 · Client config (from README)

{
  "mcpServers": {
    "opcua": {
      "command": "npx",
      "args": ["-y", "opcua-mcp-server"],
      "env": { "OPCUA_SERVER_URL": "opc.tcp://localhost:4840" }
    }
  }
}

Install steps taken from the project README (its recommended path first). Placeholders are the maintainer's. Not bench-tested by HardwareMCP yet.