Desktop IDEs & AI Apps

Use Foldr with Windsurf (MCP)

Windsurf (from Codeium) is an agentic IDE that popularised "Cascade" - long-running AI workflows that can read, edit and ship code with minimal supervision. MCP servers plug directly into Cascade as external tools. With Foldr connected, Cascade can upload build artifacts or design references and return a short URL you can drop in a PR description.

CodeiummacOS, Windows, LinuxMCP: stable

Installation

Add the Foldr MCP server to Windsurf with the snippet below. Replace fs_… with an API key from foldr.space/developers/signup. Each upload costs 5¢ - top up account credits or subscribe to Pro tier to bypass per-call charges.

{
  "mcpServers": {
    "foldr": {
      "command": "npx",
      "args": ["-y", "@foldr/mcp-server"],
      "env": { "FOLDR_API_KEY": "fs_live_..." }
    }
  }
}

Setup tip: In Windsurf, open Settings → Advanced → Model Context Protocol → Edit mcp_config.json. Restart Windsurf after saving.

Official Windsurf MCP docs

What You Can Do

Upload any file from Windsurf to Foldr and get a permanent shareable URL back in the same turn (5¢ per upload, debited from credits)
Mint short-lived capability tokens to share files with downstream agents without leaking your API key
Organize uploads into per-API-key folders with hierarchical structure
Shorten long URLs to foldr.space/s/... links - free with any API key
Hand off build artifacts, screenshots, and logs to a URL without leaving your editor

Windsurf + Foldr FAQ

How do I install the Foldr MCP server in Windsurf?

Open Windsurf's MCP configuration (the JSON settings file) and paste the config block shown above. Set FOLDR_API_KEY to a key you create at foldr.space/developers/signup. Restart Windsurf if it doesn't hot-reload.

How much does it cost to use Foldr from Windsurf?

Each upload costs 5¢. You can pay by topping up account credits via the `top_up_credits` MCP tool (min $5) - every upload then debits from balance. Or subscribe to Pro tier ($25/mo) and per-call charges are bypassed entirely. Tools that don't write data (list_files, mint_capability, get_usage, etc.) are free.

I set the key but Windsurf says the Foldr tool isn't available - what's wrong?

Three common causes: (1) Windsurf wasn't restarted after editing the config - most MCP hosts need a restart to pick up new servers. (2) The API key is wrong or missing - verify the env var name your client reads (e.g. FOLDR_API_KEY) matches the config snippet above. (3) Your client doesn't support the streamable-http transport - most modern clients do, but check Windsurf's docs for the version that added MCP support.

Can Windsurf upload files directly to Foldr, or just generate URLs?

Windsurf can do both. The MCP server exposes tools for `upload_file` (base64-encoded file content), `bulk_upload` (up to 20 files in one call), `mint_capability` (short-lived shareable links), and `create_short_url`. Any file Windsurf can read from disk can be uploaded.

Is the Foldr MCP integration with Windsurf production-ready?

Foldr's MCP server is stable and used in production - streamable-http transport at https://foldr.space/api/mcp with 23 tools. Windsurf's MCP support is currently stable and generally available. Every write endpoint accepts an Idempotency-Key so retries are safe.

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Connect Windsurf to Foldr in under a minute

Grab an API key, paste the snippet above into Windsurf's MCP config, top up credits (or grab a Pro subscription), and your agent can upload files and mint share links immediately.

Get your Foldr API key x402 details