Video guide
Connect Fastio to Claude Desktop
Watch how to set up the MCP connector in under 3 minutes.
Get started with Claude Desktop
Connect Fastio to Claude Desktop with a custom connector.
First, we'll ensure Claude can upload to Fastio
Open Claude Desktop and click Customize in the sidebar.
Add *.fast.io to allowlist
Go to Capabilities, scroll down to Domain allowlist, paste the domain below, then click Add. This allows Claude to upload files to your workspaces.
*.fast.io 
Go to Connectors
Still in the Customize panel, click Connectors in the left sidebar.
Add a custom connector
Click the Add button at the top of the Connectors list and select Add custom connector from the dropdown.
Enter the connector name
In the dialog, enter the connector name Fastio.
Fastio 
Add the MCP server URL
Paste the MCP URL below into the Remote MCP server URL field, then click Add.
https://mcp.fast.io/mcp 
Connect to the Fastio MCP Server
The Fastio connector is now added. Click the Connect button to sign in and authorize access.
Review permissions
You'll be redirected to Fastio to review permissions. Select your Access level and click Continue.
Approve the connection
Confirm the connection by clicking Approve to grant the Fastio MCP Agent access to your account.
Authorization successful
After approval, you'll see a confirmation page. Your browser will then prompt you to open Claude Desktop.
Open Claude Desktop
Click Open Link in the browser prompt to return to Claude Desktop.
Connection confirmed
You're back in Claude Desktop. The Fastio connector shows a checkmark and a confirmation toast appears in the corner.
NOTE: If the connector doesn't update to show a checkmark, try restarting Claude Desktop and check again.
You're all set
Claude is now connected to your Fastio account. You can ask Claude for details about your account to confirm the connection.
Try these prompts
Copy and paste these into Claude to see Fastio in action.
List all workspaces in this account Create a new folder named "Images" Give me a link to this newly created
folder 
Everything your agents need to get work done
Give Claude a secure space to store, analyze, and share files alongside your team.
API
org-create-workspace Create project-scoped workspaces on demand. Intelligence mode auto-indexes files for RAG.
Files + Folders
workspace-storage-* CRUD, move, copy, versions, locks, previews for 10+ formats. Chunked uploads up to 1GB.
Import
web-upload Import files from any URL. OAuth support for Google Drive, OneDrive, Box, Dropbox. No local I/O.
Semantic Search
workspace-search Find files by meaning, not keywords. "Show me contracts with indemnity clauses" works.
AI Chat (RAG)
ai-chat-create Ask questions across entire workspaces. Auto-summarization, citations, metadata extraction.
MCP Server
mcp.fast.io Consolidated tools via Streamable HTTP or SSE. Session state persisted in Durable Objects.
Webhooks
webhook-create Real-time notifications for file events. Build reactive workflows without polling.
Ownership Transfer
org-transfer-ownership Build for humans, then hand off. Agent keeps admin access after transfer.
Shares & Content Portals
share-create Three modes: Send (deliver), Receive (collect), Exchange (collaborate). Password protection, expiration, branding.
Comments & Annotations
comments-* Region-anchored feedback on images, timestamps on video/audio, page-specific on PDFs. Threaded replies.
$29/mo ($24/mo annually). 14-day Business Trial first.
Monthly usage covers storage, bandwidth, and AI operations. Resets every 30 days.
FAQ
What is the Fastio MCP server?
It's a server that provides Claude with a consolidated set of workspace tools. By adding it to your config, Claude can upload files, create share links, and query documents using RAG.
How does authentication work?
The first time Claude uses a Fastio tool, it opens a browser tab to sign in or create a free account. Your session persists, so there are no API keys to manage manually.
Can I see what Claude uploads?
Yes. Everything Claude stores is accessible at app.fast.io. You can browse, preview, comment on, and download files from any device.
Does this work with Claude Desktop and Claude Code?
Yes. It works with both. For Claude Desktop, you add the MCP config to your settings. For Claude Code, you use the 'claude mcp add' command.
What are the usage limits on the plans?
Fastio starts with a 14-day Business Trial. Our Solo plan ($29/mo) includes 1 TB storage and 300,000 credits/mo. Business ($99/mo) includes 10 TB storage and 1,200,000 credits/mo. Growth ($299/mo) includes 50 TB storage and 4,500,000 credits/mo. Existing files and share links always remain accessible.
Can Claude share files with people who don't use Claude?
Yes. Share links are regular web URLs. Recipients open them in a browser and get previews, downloads, and commenting features without needing an account.
Claude Code users are already in the terminal.
The Fastio 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 Claude a professional workspace
Enable the consolidated MCP toolset for Claude in minutes. Built-in shared workspaces, RAG search, and file sharing.