Magic MCP vs OPC UA MCP Server
A side-by-side look at the Magic MCP and OPC UA MCP Server MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Magic MCP for architecture & design work as a local process; choose OPC UA MCP Server for industrial & iot over a hosted endpoint. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Magic MCP when
- You need dedicated capabilities in the Architecture & Design domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
TWENTY_FIRST_API_KEY, API_KEY_21ST.
Choose OPC UA MCP Server when
- You need dedicated capabilities in the Industrial & IoT domain.
- You prefer a remote HTTP/SSE transport.
- You want tools like
opcua_read, opcua_write, opcua_get_value.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Architecture & Design | Industrial & IoT |
| Quality signal | 53/100 · Good | 53/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Remote HTTP/SSE |
| Auth | API key required | Not declared |
| Pricing | Paid service | Not declared |
| Required env vars | TWENTY_FIRST_API_KEYAPI_KEY_21ST | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 6,242 | 5 |
| Directory activity | 16 views 1 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | Not listed | 16 |
| Full listing | View Magic MCP | View OPC UA MCP Server |
Tools & capabilities
Magic MCP tools
No tool names declared yet. Check the project README from the listing page.
OPC UA MCP Server tools 16
opcua_readRead one or more node values. Subscribed nodes are served from the live cache; others go live unless `max_age_ms` allows a cached value.opcua_writeWrite a value to a node. Validates the value's type against the node before writing.opcua_get_valueRead a single node's value - a convenience wrapper over `opcua_read`.opcua_get_value_by_nameRead a value by browse name instead of node ID, via the discovery index.opcua_browseList a node's immediate children.opcua_browse_nodesRecursively browse from a node up to a depth limit, nesting children under their parent.opcua_node_infoGet a node's metadata (data type, access level, etc.).opcua_find_similar_nodesFuzzy-match browse names against the discovery index.opcua_subscribeStart push-based updates for one or more nodes at a given interval.opcua_unsubscribeCancel a subscription, by ID or by naming one of its nodes.opcua_list_subscriptionsList active subscriptions.opcua_connectManage the connection explicitly (mainly relevant in stdio mode).- +4 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Magic MCP
{
"mcpServers": {
"21st-dev-magic-mcp": {
"command": "npx",
"args": [
"-y",
"@21st-dev/cli@latest"
],
"env": {
"TWENTY_FIRST_API_KEY": "YOUR_TWENTY_FIRST_API_KEY_HERE",
"API_KEY_21ST": "YOUR_API_KEY_21ST_HERE"
}
}
}
}
OPC UA MCP Server
{
"mcpServers": {
"opc-ua-mcp-server": {
"url": "https://xyz.trycloudflare.com/mcp"
}
}
}
Frequently asked questions
Magic MCP is categorized under Architecture & Design and uses a local stdio subprocess. OPC UA MCP Server belongs to Industrial & IoT and uses a remote HTTP/SSE transport. Pick Magic MCP for architecture & design work and OPC UA MCP Server for industrial & iot.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Magic MCP is listed as a paid service. Auth: api key required. OPC UA MCP Server has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add 21st-dev-magic-mcp and opc-ua-mcp-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Magic MCP has a quality signal of 53/100 (Good) with 16 views, 1 installs and 6,242 GitHub stars. OPC UA MCP Server has 53/100 (Good) with 4 views, 0 installs and 5 GitHub stars.