Use Foldr with LlamaIndex (MCP)
LlamaIndex is the leading data framework for building RAG and agentic apps, used heavily in enterprise search and document workflows. LlamaIndex ships an `McpToolSpec` that auto-generates tools from any MCP server. Foldr gives a LlamaIndex agent a way to write results back out - useful when it produces summaries or generated docs.
Installation
Add the Foldr MCP server to LlamaIndex 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.
pip install llama-index-tools-mcp
# Python
from llama_index.tools.mcp import BasicMCPClient, McpToolSpec
mcp = BasicMCPClient("npx", args=["-y", "@foldr/mcp-server"],
env={"FOLDR_API_KEY": "fs_live_..."})
tools = McpToolSpec(client=mcp).to_tool_list()What You Can Do
- Upload any file from LlamaIndex 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
- Wire Foldr tools into any existing LlamaIndex agent with a few lines of config
LlamaIndex + Foldr FAQ
How do I install the Foldr MCP server in LlamaIndex?
Open LlamaIndex's MCP configuration (the CLI) and paste the config block shown above. Set FOLDR_API_KEY to a key you create at foldr.space/developers/signup. Restart LlamaIndex if it doesn't hot-reload.
How much does it cost to use Foldr from LlamaIndex?
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 LlamaIndex says the Foldr tool isn't available - what's wrong?
Three common causes: (1) LlamaIndex 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 LlamaIndex's docs for the version that added MCP support.
Can LlamaIndex upload files directly to Foldr, or just generate URLs?
LlamaIndex 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 LlamaIndex can read from disk can be uploaded.
Is the Foldr MCP integration with LlamaIndex production-ready?
Foldr's MCP server is stable and used in production - streamable-http transport at https://foldr.space/api/mcp with 23 tools. LlamaIndex's MCP support is currently stable and generally available. Every write endpoint accepts an Idempotency-Key so retries are safe.
Related MCP Integrations
Connect LlamaIndex to Foldr in under a minute
Grab an API key, paste the snippet above into LlamaIndex's MCP config, top up credits (or grab a Pro subscription), and your agent can upload files and mint share links immediately.