Windsurf Hermoso hook_variants

How to: Windsurf Hermoso hook_variants

client:Windsurf transport:streamable-http tool:hook_variants

Add Hermoso to Windsurf

01
Open ~/.codeium/windsurf/mcp_config.json and merge this in. Keep any servers already there.

{
  "mcpServers": {
    "hermoso": {
      "serverUrl": "https://app.hermoso.ai/mcp?src=registry"
    }
  }
}

02
Save the file and restart Windsurf.
03
Ask for something hook_variants does. Windsurf lists the server's tools on connect and calls hook_variants itself — you do not invoke it by name.
04
If nothing happens, check the server is running and that Hermoso'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

Set these first

Hermoso will not start until these are set, so hook_variants never becomes available.

HERMOSO_TOKEN
HERMOSO_API_BASE

Same tool, other clients

This list was read from the server itself, by connecting to it and calling tools/list on 24 September 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.

Hermoso MCP server