Chat Clients

Use Foldr with LibreChat (MCP)

LibreChat is a mature open-source ChatGPT alternative with plugin support, multi-user auth, and a growing MCP implementation. It is the most common self-hosted chat stack for teams that want centralized billing plus BYO-model. Foldr fits in alongside its other tool plugins for quick file sharing from chat.

LibreChat (OSS)Self-hosted (Docker, K8s)MCP: beta

Installation

Add the Foldr MCP server to LibreChat 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.

# librechat.yaml
mcpServers:
  foldr:
    command: npx
    args:
      - -y
      - '@foldr/mcp-server'
    env:
      FOLDR_API_KEY: fs_live_...

Setup tip: Edit librechat.yaml and restart the API container. Enable the tool under Endpoints → Agents.

Official LibreChat MCP docs

What You Can Do

Upload any file from LibreChat 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
Let chat participants retrieve uploaded files by asking for them by filename

LibreChat + Foldr FAQ

How do I install the Foldr MCP server in LibreChat?

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

How much does it cost to use Foldr from LibreChat?

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

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

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

LibreChat 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 LibreChat can read from disk can be uploaded.

Is the Foldr MCP integration with LibreChat production-ready?

Foldr's MCP server is stable and used in production - streamable-http transport at https://foldr.space/api/mcp with 23 tools. LibreChat's MCP support is currently in public beta - suitable for day-to-day use. Every write endpoint accepts an Idempotency-Key so retries are safe.

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Connect LibreChat to Foldr in under a minute

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