Emerging / New

Use Foldr with Msty (MCP)

Msty is a polished desktop app for local and cloud LLMs with parallel multi-model chats and a slick UX. Msty Studio added MCP tool support as part of its 2026 agent update. Foldr gives Msty users a clean way to share output from any of the local models they're running side-by-side.

MstymacOS, Windows, LinuxMCP: community

Installation

Add the Foldr MCP server to Msty 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: Msty → Settings → Tools → MCP Servers → Add.

Official Msty MCP docs

What You Can Do

Upload any file from Msty 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

Msty + Foldr FAQ

How do I install the Foldr MCP server in Msty?

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

How much does it cost to use Foldr from Msty?

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

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

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

Msty 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 Msty can read from disk can be uploaded.

Is the Foldr MCP integration with Msty production-ready?

Foldr's MCP server is stable and used in production - streamable-http transport at https://foldr.space/api/mcp with 23 tools. Msty's MCP support is currently community-maintained - check the upstream repo for current status. Every write endpoint accepts an Idempotency-Key so retries are safe.

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Connect Msty to Foldr in under a minute

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