Get started with Cursor
Connect Fast.io to Cursor by adding a custom MCP config.
Open Cursor settings
Click the gear icon in the top-right corner of the Cursor window, then click Settings in the dropdown menu.
Open MCP settings
Click Tools & MCP in the left sidebar, then click Add Custom MCP.
Add the Fast.io MCP config
Paste the following JSON into the MCP config editor.
{
"mcpServers": {
"fast-io": {
"url": "https://mcp.fast.io/mcp",
"headers": {
"Authorization": "Bearer ${env:FASTIO_API_KEY}"
}
}
}
} 
Go to your Fast.io account settings
Go to go.fast.io/signup and create a free account, or sign in if you already have one. Once you're signed in, click your profile icon in the bottom-left corner of the page, then click Account & Admin in the menu.
Navigate to API Keys
Go to API Keys in the left sidebar of your Fast.io dashboard. Click the Create API Key button.
Create your API key
Give your API key a name like Cursor. Click Create.
Copy your API key
Copy the generated API key. This is the only time you'll see it, so save it somewhere safe. Once you've copied it, make sure you click Done.
Set the API key in your terminal
Open a terminal and run the command below,
replacing your key with your actual API key. Then restart Cursor.
launchctl setenv FASTIO_API_KEY 'your key' 
Ask Cursor about your account
Open the Cursor chat and paste the prompt below to verify the connection.
can you see your fast.io account? 
You're all set
Cursor can now access your Fast.io account. You'll see your account details, workspaces, and storage information in the chat response.
Try these prompts
Copy and paste these into Cursor to see Fast.io in action.
List all workspaces in this account Create a new folder named "Images" Give me a link to this newly created
folder Free forever. 50GB storage included. No credit card required.
Monthly credits cover storage, bandwidth, and AI operations. Resets every 30 days.
FAQ
What is the Fast.io MCP server?
It's a server that provides Cursor with 251 workspace tools. By adding it to your project config, Cursor can upload files, create share links, and query documents using RAG.
How does authentication work?
You create an API key in your Fast.io account and set it as an environment variable. Cursor uses this key to authenticate with the MCP server automatically.
Can I see what Cursor uploads?
Yes. Everything Cursor stores is accessible at app.fast.io. You can browse, preview, comment on, and download files from any device.
Is this per-project or global?
The MCP config lives in .cursor/mcp.json in your project root, so each project can have its own setup. You can also share the config across projects by copying the file.
What happens when I hit the credit limit?
You get 5,000 credits per month. When they run out, new uploads and AI queries pause until the next cycle. Existing files and share links remain accessible.
Can Cursor share files with people who don't use Cursor?
Yes. Share links are regular web URLs. Recipients open them in a browser and get previews, downloads, and commenting features without needing an account.
Cursor's integrated terminal can run fastio commands directly.
The Fast.io CLI gives you the same workspace tools — upload,
search, share — as a standalone command. It also includes a
built-in MCP server via fastio mcp.
npm install --global @vividengine/fastio-cli
Learn more
Give Cursor a professional workspace
Enable 251 tools for Cursor in minutes. Built-in shared workspaces, RAG search, and file sharing.