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mcp/harbor
Windsurf

once for Windsurf

io.github.stringsofthemind-oss/once

Execution-safety MCP for AI coding agents protecting consequential writes from unsafe retries.

client:Windsurf transport:stdio runtime:npm

Install once in Windsurf

~/.codeium/windsurf/mcp_config.json · windows: %USERPROFILE%\.codeium\windsurf\mcp_config.json

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "once": {
      "command": "npx",
      "args": [
        "-y",
        "@once-agent/mcp"
      ],
      "env": {
        "ONCE_API_KEY": "<ONCE_API_KEY>"
      }
    }
  }
}

Global only — Windsurf has no per-project MCP config. Refresh Cascade after saving. Windsurf docs

once in other clients

once MCP server