Desktop IDEs & AI Apps

Use Foldr with Cursor (MCP)

Cursor is the AI-first fork of VS Code used by hundreds of thousands of engineers for paired coding with Claude and GPT-4. Cursor added first-class MCP support in its 0.45 release, exposing servers to every agent and Cmd-K command. Adding Foldr gives Cursor a place to upload generated assets (screenshots, PDFs, design exports) and turn them into shareable URLs inline.

AnyspheremacOS, Windows, LinuxMCP: stable

Installation

Add the Foldr MCP server to Cursor 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": {
      "url": "https://foldr.space/api/mcp",
      "headers": {
        "Authorization": "Bearer fs_live_..."
      }
    }
  }
}

Setup tip: Open Cursor Settings → MCP → "Add new MCP server" and paste the config, or edit ~/.cursor/mcp.json directly.

Official Cursor MCP docs

What You Can Do

Upload any file from Cursor 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

Cursor + Foldr FAQ

How do I install the Foldr MCP server in Cursor?

Open Cursor'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 Cursor if it doesn't hot-reload.

How much does it cost to use Foldr from Cursor?

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 Cursor says the Foldr tool isn't available - what's wrong?

Three common causes: (1) Cursor 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 Cursor's docs for the version that added MCP support.

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

Cursor 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 Cursor can read from disk can be uploaded.

Is the Foldr MCP integration with Cursor production-ready?

Foldr's MCP server is stable and used in production - streamable-http transport at https://foldr.space/api/mcp with 23 tools. Cursor'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 Cursor to Foldr in under a minute

Grab an API key, paste the snippet above into Cursor'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