Connect an agent, bring your files, get answers you can check.

Fastio is a project workspace your agents can reach. Connect the assistant you already use, move the files you already have, and start asking questions about them.

Start 14-day trial, cancel anytime Book a demo
Connect your agent: View setup guides
Step 01

Add Fastio to ChatGPT or Claude.

Install the Fastio plugin in ChatGPT, or add Fastio as a connector in Claude. Either way you sign in once and choose which workspaces it can reach, and whether it can change anything.

ChatGPT

Plugin

Install the Fastio plugin from ChatGPT's plugin directory.

  1. Open the Fastio listing and select Install plugin.
  2. Select Connect and sign in to Fastio.
  3. Type @Fastio in a chat and ask about your files.
Install plugin

Claude

Connector

Add Fastio as a custom connector in Claude on the web or desktop.

  1. In Claude, open Customize, then Connectors, and add a custom connector.
  2. Paste the Fastio address below.
  3. Select Connect and sign in to Fastio.
https://mcp.fast.io/mcp/tools
See the Claude setup
Also works with Codex same plugin as ChatGPT Grok Bot Add to Grok Bot Cursor from the Cursor Marketplace Any MCP client setup guides
Step 02

Bring in the files you already have.

Four ways in, and you can use all four. Sync runs one-way or two-way, on a schedule or on demand, and nothing has to be reorganized first.

  • Keep a Google Drive, Dropbox, Box, or OneDrive folder in sync, or import a folder once. How sync and import work
  • The desktop app keeps a folder on your computer and a Fastio workspace in step, both ways, on Mac and Windows. Get the desktop app
  • Drag files and folders straight into a workspace in the browser.
  • Or let your agent write its own output into a workspace as it works.
Step 03

Ask questions, and see where answers came from.

Your files stop being a folder tree your agent has to guess at, and start being something it can read, cite, and pull data out of.

  • Ask a question about a workspace and get an answer that names the files it came from, so you can open them and check.
  • Pull typed fields out of a set of files: parties, dates, amounts, terms. You preview and approve before anything is saved. How extraction works
  • Files are indexed for search as they arrive, so your agent works from what is actually in the documents, not just their names.
Claude
Which files back the March 14 date?
Used 1 tool · fastio · search_files

A staged cutover finishing March 14, with a two-week parallel run before the old system is retired.

Migration-Plan-v3.pdf Migration-Risk-Review.pdf
Company Brain / Files
Name By Status
Northwind-Kickoff-Call.txt
DW
Indexed
Migration-Plan-v3.pdf
TT
Cited
Migration-Risk-Review.pdf
DW
Cited
Parallel-Run-Checklist.xlsx
TT
Indexed
cited files come back with the answer
Worked example

One client folder in, diligence questions answered.

A three-person consultancy takes on a diligence review. Here are the same three steps, on a real pile of client documents.

Step 01

The agent gets connected

The lead consultant adds Fastio to the assistant she already works in. Her two colleagues do the same in their own clients.

Step 02

The client folder comes in

Two years of the client's contracts and board minutes transfer over from their cloud storage, folders intact. A few scanned PDFs go up from a laptop.

Step 03

The questions get answered

Diligence starts. The team asks in plain language and reads answers that point back at the exact documents.

JM

Which of this client's customer contracts renew automatically next year, and who signed them?

Four contracts renew automatically in 2027. Three were signed by the client's COO, and one by a regional director whose signing authority is capped below the contract value.

Sources MSA_Northwind_2024.pdf Board_Minutes_2025-03.pdf

Illustrative example. Names and documents are made up.

Access and oversight

You decide what your agent can reach.

Agents get access the same way people do, and everything they touch is on the record.

Five permission levels

Owner, Admin, Member, Guest, and View. People and agents use the same model, so access is one decision, not two.

Scoped agent tokens

Every agent connects with a token scoped to the workspaces you grant. It cannot reach anything you did not hand it.

A complete activity log

Every action by a person or an agent is recorded: what was read, what was added, what was shared, and when.

Encrypted, on certified infrastructure

Files are encrypted at rest and in transit, on infrastructure partners certified to industry-leading standards.

Put your files to work.

Connect your agent, bring a folder in, and ask it something.

Start 14-day trial, cancel anytime Book a Demo
The trial lasts 14 days and requires a card. Plans start at $9.99 a month. A real person can help with setup.