Use Foldr with Mastra (MCP)
Mastra is the TypeScript-first agent framework from the Gatsby co-founder, focused on production agents with evals, workflows, and first-class MCP. Mastra treats MCP as a native tool source, not a bolt-on. Foldr is a drop-in tool module — one line in your Mastra config and every agent can upload files.
Installation
Add the Foldr MCP server to Mastra with the snippet below. Replace fs_live_... with an API key from foldr.space/developers.
// mastra.config.ts
import { MCPConfiguration } from "@mastra/mcp";
export const mcp = new MCPConfiguration({
servers: {
foldr: {
command: "npx",
args: ["-y", "@foldr/mcp-server"],
env: { FOLDR_API_KEY: "fs_live_..." },
},
},
});What You Can Do
- Upload any file from Mastra to Foldr and get a shareable URL back in the same turn
- Shorten long URLs to foldr.space/s/... links without leaving Mastra
- Create or update a Foldr bio page from a Mastra conversation
- Generate a hosted Foldr form and paste the submission URL into your reply
- Wire Foldr tools into any existing Mastra agent with a few lines of config
Mastra + Foldr FAQ
How do I install the Foldr MCP server in Mastra?
Open Mastra's MCP configuration (the CLI) and paste the config block shown above. Set FOLDR_API_KEY to a key you create at foldr.space/api-keys. Restart Mastra if it doesn't hot-reload.
Which Foldr plan do I need to use the MCP integration with Mastra?
The Foldr MCP server is available on every paid plan (Pro from $5/mo and Developer tier for API-heavy usage). The free tier can generate temporary 7-day links; for permanent storage, a Pro plan or Foldr Space is required.
I set the key but Mastra says the Foldr tool isn't available — what's wrong?
The two most common issues: (1) Mastra wasn't restarted after editing the config — most MCP hosts need a restart to pick up new servers. (2) Your API key is missing the `mcp:invoke` scope. Regenerate a key at foldr.space/api-keys with full scope and retry.
Can Mastra upload files directly to Foldr, or just generate URLs?
Mastra can do both. The MCP server exposes tools for `upload_file` (takes a local path or base64 blob), `shorten_url`, and `create_bio_page`. Any file Mastra can read from disk can be uploaded.
Is the Foldr MCP integration with Mastra production-ready?
Foldr's MCP server is stable and used in production. Mastra's MCP support is currently stable and generally available. We pin to stable SDK versions and publish changelog entries for every breaking change.
Related MCP Integrations
Connect Mastra to Foldr in under a minute
Grab an API key, paste the snippet above into Mastra's MCP config, and your agent can upload files and share URLs immediately.
Get your Foldr API key