Claude + Fast.io

Workspaces for Claude

Claude is powerful. Your files should be too. Give Claude a 50GB workspace to manage documents, collaborate on code, and share results with your team.

llms.txt • skill.md

Get started with Claude Desktop

Connect Fast.io to Claude Desktop with a custom connector.

Open Customize

Open Claude Desktop and click Customize in the left sidebar.

Claude Desktop sidebar with Customize option

Go to Connectors

On the Customize page, select Connectors in the left sidebar.

Claude Desktop Customize page showing Connectors section

Add a custom connector

Click the + button at the top of the Connectors list and select Add custom connector from the dropdown.

Claude Desktop Connectors list with Add custom connector dropdown

Enter the connector name

In the dialog, enter the connector name below.

fast-io

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

Add custom connector dialog with MCP URL filled in

Review connector tools and permissions

The Fast.io connector is now added. You can review and configure tool permissions for interactive, read-only, and write/delete tools. Click the back arrow next to the left sidebar Customize heading to return to chat.

Claude Desktop Fast.io connector with tool permissions

Ask Claude to sign in to Fast.io

Start a new chat and type the prompt below. Claude will provide a link to authenticate through your browser.

sign in to fast.io

Claude Desktop chat with sign-in link for Fast.io

Sign in to Fast.io

Click the sign-in link to open Fast.io in your browser. Sign in with Google, Microsoft, or email, or create a new account.

Fast.io sign-in page with authentication options

Review permissions

Review the permissions that the Fast.io MCP Agent is requesting. You can configure organization and workspace access, then click Continue.

Approve the connection

Confirm the connection by clicking Approve to grant the Fast.io MCP Agent access to your account.

Fast.io approve access confirmation page

Copy the authorization code

After approval, you'll receive an authorization code. Click Copy Code to copy it to your clipboard.

Fast.io authorization code page with Copy Code button

Paste the code into Claude

Back in Claude Desktop, paste the authorization code into the chat and send it.

Claude Desktop chat with authorization code pasted

You're signed in

Claude confirms you're signed in to Fast.io. You can now start using Fast.io tools directly from Claude Desktop. Try the prompt below to verify everything is working.

can you give me a summary of my fast.io
                                    account details?

Claude Desktop confirming successful Fast.io sign-in

You're all set

Claude will use the fast-io integration to retrieve your account information.

Claude Desktop showing Fast.io account details

Try these prompts

Copy and paste these into Claude 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

Get started with Claude Code

Add the Fast.io MCP server to Claude Code using your terminal.

Add the MCP server

Open your terminal and run the command below. This will add the Fast.io MCP server to Claude Code.

claude mcp add --transport http fast-io
                                    https://mcp.fast.io/mcp

Claude Desktop Fast.io connector permission configuration

Check the MCP server list

Run the command below to confirm fast-io appears in your MCP server list.

claude mcp list

Verify that the MCP server was added

The newly added MCP server, fast-io, should now appear in the list with a Connected status indicator.

Start a new Claude Code session

Open a new Claude Code session by running the command below in your terminal.

claude

Open the Fast.io agent guide

Type /fast-io to open the Fast.io agent guide. This will display common starting points.

/fast-io

Sign in to your Fast.io account

Fast.io will prompt you with common starting points. Type sign in to begin the authentication flow and connect Claude Code to your account.

Choose an authentication method

In the auth method list, choose the Browser login (PKCE) option with up/down arrow keys.

Open the sign-in URL in your browser

Claude Code will generate a sign-in URL. Copy the entire URL and paste it into your browser.

Sign in to Fast.io

Review permissions

Choose the access level for Claude Code. Select Full Access to give Claude complete access to your organizations and workspaces, or configure specific organization and workspace permissions.

Approve the connection

Review the permissions summary and click Approve to authorize Claude Code to access your Fast.io account.

Copy the authorization code

After approving, Fast.io will display an authorization code. Click Copy Code to copy it to your clipboard. You'll paste this back into Claude Code in the next step.

Paste the code into Claude Code

Return to your terminal and paste the authorization code where Claude Code is waiting. This completes the authentication handshake between Claude Code and Fast.io.

Authentication complete

Claude Code confirms you're signed in and your session is active. You can now start using Fast.io tools directly from the terminal.

Explore your Fast.io account

Ask Claude something like "can you see your fast.io account?" to get a summary of your profile, organization, plan details, and remaining credits.

Try these prompts

Copy and paste these into Claude 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

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 storage with 50GB free. 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

251 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 & Data Rooms

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.

$0/mo

Free forever. 50GB storage included. No credit card required.

50 GB

Cloud Storage

5,000

Monthly Credits

251

MCP Tools

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 Claude with 251 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 Fast.io 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 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 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.

Fast.io CLI

Claude Code users are already in the terminal.

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 Claude a professional workspace

Enable 251 tools for Claude in minutes. Built-in shared workspaces, RAG search, and file sharing.

Get Started Setup Guide