Windsurf Castos MCP by usefulapi castos_create_private_subscriber
How to: Windsurf Castos MCP by usefulapi castos_create_private_subscriber
Add Castos MCP by usefulapi to Windsurf
-
01
Open ~/.codeium/windsurf/mcp_config.json and merge this in. Keep any servers already there.
{
"mcpServers": {
"castos": {
"serverUrl": "https://castos.usefulapi.io/mcp"
}
}
}-
02
Save the file and restart Windsurf.
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03
Ask for something castos_create_private_subscriber does. Windsurf lists the server's tools on connect and calls castos_create_private_subscriber itself — you do not invoke it by name.
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04
If nothing happens, check the server is running and that Castos MCP by usefulapi's identifier in your config matches the one above exactly.
Global only — Windsurf has no per-project MCP config. Refresh Cascade after saving. Windsurf docs
Same tool, other clients
This list was read from the server itself, by connecting to it and calling tools/list on 14 November 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.