Agent Infrastructure

Cloud Storage for AI Agents

Your agents need somewhere to put files. Fast.io gives them dedicated cloud storage to manage files and collaborate with humans.

API-first • MCP-ready • Workspace-scoped • 100GB free

Send your agent to Fast.io

curl -s https://mcp.fast.io/skill.md

1.Send this to your agent
2.They sign up & build your workspace
3.Click the claim link they send you

Full API Docs•View skill.md

Works with your favorite agents

Everything your AI needs to get work done

Give agents a secure space to store, analyze, and share files alongside your team.

API

org-create-workspace

Create project-scoped storage with 100GB 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.

Use Cases

Powering every type of agent: from browser automation to file delivery, Fast.io enables any agent to store and share.

Python / MCP

# Upload a file from the browser agent
session = await mcp.call(
    "upload-create-session",
    {
        "workspace": "screenshots",
        "path": "/2024/receipts/",
        "filename": "order-confirmation.png"
    }
)
# Or import directly from a URL
job = await mcp.call(
    "web-upload",
    {
        "workspace": "screenshots",
        "url": "https://example.com/receipt.pdf",
        "path": "/2024/receipts/"
    }
)

Connect via MCP

Works with any MCP-compatible client. Claude Desktop, Cursor, Windsurf, and more.

claude_desktop_config.json

{
  "mcpServers": {
    "fastio": {
      "url": "https://mcp.fast.io/mcp"
    }
  }
}

Or use SSE at https://mcp.fast.io/sse for legacy clients

View the LLMs.txt →

FAQ

What makes Fast.io different from Drive/Dropbox for agents?

Built-in MCP server with 251 tools. AI intelligence auto-indexes files for RAG queries. Ownership transfer lets agents build, then hand off to humans.

How do you scope an agent to a single workspace?

Create a workspace per task. Workspace-scoped tokens limit access to that workspace only. Agent retains admin after ownership transfer.

Do you support large files and streaming downloads?

Up to 1GB per file. HLS adaptive streaming for video (50-60% faster than raw). Chunked uploads with resume support.

How does the AI/RAG feature work?

Enable "intelligence" on a workspace. Files are auto-indexed, summarized, and queryable via ai-chat-create. Answers include citations to specific pages.

What's the ownership transfer flow?

Agent creates org → builds workspaces/shares → calls org-transfer-ownership → human claims via link → agent keeps admin access.

What audit logs do you provide?

Full event log via events-search. AI-powered summaries via events-summarize. Track uploads, downloads, shares, access by identity.

Is there a free tier?

Yes. 100GB storage, 5,000 monthly credits, 5 workspaces, 50 shares. No credit card, no trial period, no expiration.

Get started in seconds

Install the MCP server or call the REST API directly. 100GB free, no credit card.

Get Started Docs MCP Setup