CLI & Terminal

Use Foldr with Gemini CLI (MCP)

Gemini CLI is Google's official open-source command-line agent for the Gemini models, with a 1M-token default context and native tool-calling. Gemini CLI reads MCP servers from a `settings.json` file and exposes them as tools to the agent. Foldr gives the CLI a real upload primitive instead of relying on shell scripts.

GooglemacOS, Linux, WindowsMCP: stable

Installation

Add the Foldr MCP server to Gemini CLI 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: Edit ~/.gemini/settings.json and restart the CLI with `gemini`.

Official Gemini CLI MCP docs

What You Can Do

Upload any file from Gemini CLI 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

Gemini CLI + Foldr FAQ

How do I install the Foldr MCP server in Gemini CLI?

Open Gemini CLI'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 Gemini CLI if it doesn't hot-reload.

How much does it cost to use Foldr from Gemini CLI?

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

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

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

Gemini CLI 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 Gemini CLI can read from disk can be uploaded.

Is the Foldr MCP integration with Gemini CLI production-ready?

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

Grab an API key, paste the snippet above into Gemini CLI'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