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Windsurf keeps its MCP servers in a config file that you open from the Cascade panel. Add OpenFinance there with your API key, and Cascade picks it up after a refresh.
1

Open Cascade

Click the Cascade icon (the AI assistant panel).
2

Open MCP config

Click the hammer icon at the top of the Cascade panel, then click Configure.
3

Add the server

Add the OpenFinance server inside the mcpServers object:
Replace open_xxxxx with your key. Please make an account at openfinance.tech to get your keys.
4

Refresh

Save the file. Click the Refresh button next to the MCP server list, or restart Windsurf.
5

Verify

OpenFinance should appear in the server list as connected.
Windsurf uses serverUrl instead of url. This is different from most other clients.