Add the DeepL MCP server to Windsurf

Config last verified Jun 1, 2026

The exact config to run DeepL in Windsurf — paste it in, restart, and the tools load.

Prerequisites

Windsurf installed.
DEEPL_API_KEY — DeepL API key from your DeepL account. Works with the free or pro API plan. Required.

Setup

1. Open `~/.codeium/windsurf/mcp_config.json`

On Windows the file lives at %USERPROFILE%\.codeium\windsurf\mcp_config.json.

2. Add this configuration

Add to ~/.codeium/windsurf/mcp_config.json

~/.codeium/windsurf/mcp_config.json

json

{
  "mcpServers": {
    "deepl": {
      "command": "npx",
      "args": [
        "-y",
        "deepl-mcp-server"
      ],
      "env": {
        "DEEPL_API_KEY": "<DEEPL_API_KEY>"
      }
    }
  }
}

3. Restart Windsurf and confirm the DeepL tools load.

Gotchas

Windsurf's Cascade reads MCP servers from an "mcpServers" object in ~/.codeium/windsurf/mcp_config.json. Unlike most clients, remote servers are configured with the "serverUrl" field rather than "url", so a config that uses "url" silently fails to connect. Native remote transport is supported without an OAuth flow.

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