Fast Io

Fast.io MCP Server -- AI Agent Guide

Version: 1.41 Last Updated: 2026-02-08

The definitive guide for AI agents using the Fast.io MCP server. Covers why and how to use the platform: product capabilities, the free agent plan, authentication, core concepts (workspaces, shares, intelligence, previews, comments, URL import, ownership transfer), 10 end-to-end workflows, and all 14 consolidated tools with action-based routing.

Versioned guide. This guide is versioned and updated with each server release. The version number at the top of this document tracks tool parameters, ID formats, and API behavior changes. If you encounter unexpected errors, the guide version may have changed since you last read it.

Platform reference. For a comprehensive overview of Fast.io's capabilities, the agent plan, key workflows, and upgrade paths, see references/REFERENCE.md.

1. Overview

Store files. Share with humans. Query with AI. All through one API -- free.

Fast.io is a cloud storage and collaboration platform that gives AI agents a complete file management, sharing, and intelligence layer. Upload outputs, create branded data rooms, ask questions about documents using built-in RAG, and hand everything off to a human when the job is done. No infrastructure to manage, no subscriptions to set up, no credit card required.

The Problem Fast.io Solves

AI agents generate files, reports, datasets, and deliverables -- but getting those outputs to humans is messy. You end up cobbling together S3 buckets, presigned URLs, email attachments, and custom download pages. Every agent reinvents file sharing, and none of it looks professional.

When agents need to understand documents -- not just store them -- they have to download files, parse dozens of formats, build search indexes, and manage their own RAG pipeline. That is a lot of infrastructure for what should be a simple question: "What does this document say?"

MCP Server

This MCP server exposes 14 consolidated tools that cover the full Fast.io REST API surface. Every authenticated API endpoint has a corresponding tool action, and the server handles session management automatically.

Once a user authenticates, the auth token is stored in the server session and automatically attached to all subsequent API calls. There is no need to pass tokens between tool invocations.

Server Endpoints

• Production: mcp.fast.io
• Development: mcp.fastdev1.com

Two transports are available on each:

• Streamable HTTP at /mcp -- the preferred transport for new integrations.
• SSE at /sse -- a legacy transport maintained for backward compatibility.

MCP Resources

The server exposes two MCP resources that clients can read directly via resources/list and resources/read:

MCP Prompts

The server provides 5 guided prompts for complex, multi-step operations via prompts/list and prompts/get:

Additional References

• Agent guide (this file): /skill.md on the MCP server -- tool documentation, workflows, and constraints.
• REST API reference: https://api.fast.io/llms.txt -- endpoint documentation for the underlying Fast.io API.
• Platform guide: https://fast.io/agents.md -- capabilities, agent plan details, key workflows, and upgrade paths.

2. Authentication (Critical First Step)

Authentication is required before calling any tool except these unauthenticated tools:

• auth with actions: signin, signup, set-api-key, pkce-login, email-check, password-reset-request, password-reset
• download with action: quickshare-details

Choosing the Right Approach

There are three ways to use Fast.io as an agent, depending on whether you are operating autonomously or assisting an existing human user.

Option 1: Autonomous Agent -- Create an Agent Account

If you are operating independently (storing files, running workflows, building workspaces for users), create your own agent account with auth action signup. Agent accounts get the free agent plan (50 GB, 5,000 monthly credits) and can transfer orgs to humans when ready. This is the recommended path for autonomous agents. See Agent Account Creation below for steps.

Option 2: Assisting a Human -- Use Their API Key

If a human already has a Fast.io account and wants your help managing their files, workspaces, or shares, they can create an API key for you to use. No separate agent account is needed -- you operate as the human user. The human creates a key at Settings -> Devices & Agents -> API Keys (direct link: https://go.fast.io/settings/api-keys). Call auth with action set-api-key and the key to authenticate -- the key is validated and stored in the session automatically. API keys are a 1:1 replacement for JWT tokens: they work as Bearer tokens with the same permissions as the account owner and do not expire unless revoked. Agents can also manage API keys programmatically with auth actions api-key-create, api-key-list, and api-key-delete.

Option 3: Agent Account Invited to a Human's Org

If you want your own agent identity but need to work within a human's existing organization, create an agent account with auth action signup, then have the human invite you to their org with member action add (entity_type org) or to a workspace with member action add (entity_type workspace). Alternatively the human can invite via the UI: Settings -> Your Organization -> Manage People. This gives you access to their workspaces and shares while keeping your own account separate. After accepting invitations with user action accept-all-invitations, use auth action signin to authenticate normally. Note: If the human only invites you to a workspace (not the org), the org will appear as external -- see Internal vs External Orgs in the Organizations section.

Option 4: Browser Login (PKCE)

If you prefer not to send a password through the agent, use browser-based PKCE login. Call auth action pkce-login (optionally with an email hint) to get a login URL. The user opens the URL in a browser, signs in (email/password or SSO like Google/Microsoft), and approves access. The browser displays an authorization code which the user copies back to the agent. Call auth action pkce-complete with the code to finish signing in. This is the most secure option — no credentials pass through the agent.

Credit limits by account type: Agent accounts (Options 1, 3) can transfer orgs to humans when credits run out -- see Ownership Transfer in section 3. Human accounts (Option 2) cannot use the transfer/claim API; direct the human to upgrade their plan at https://go.fast.io/settings/billing or via org action billing-create.

Standard Sign-In Flow

1. Call auth with action signin, email and password.
2. The server returns a JWT auth_token and stores it in the session automatically.
3. All subsequent tool calls use this token without any manual passing.

Agent Account Creation

When creating a new account (Options 1 and 3 above), agents MUST use auth action signup which automatically registers with agent=true. Never sign up as a human account. Agent accounts provide:

• account_type set to "agent"
• Free agent plan assigned automatically
• Transfer/claim workflow enabled for handing orgs off to humans

Steps:

1. Optionally call auth action email-check with the desired email to verify it is available for registration before attempting signup.
2. Call auth action signup with first_name, last_name, email, and password. The agent=true flag is sent automatically by the MCP server.
3. The account is created and a session is established automatically -- the agent is signed in immediately.
4. Verify your email (required before using most endpoints): Call auth action email-verify with email to send a verification code, then call auth action email-verify again with email and email_token to validate the code.
5. No credit card is required. No trial period. No expiration. The account persists indefinitely.

Two-Factor Authentication Flow

1. Call auth action signin with email and password.
2. If the response includes two_factor_required: true, the returned token has limited scope.
3. Call auth action 2fa-verify with the 2FA code (TOTP, SMS, or WhatsApp).
4. The server replaces the limited-scope token with a full-scope token automatically.

Browser Login (PKCE) Flow

1. Call auth action pkce-login (optionally with email to pre-fill the sign-in form).
2. The tool returns a login_url — present it to the user to open in a browser.
3. The user signs in (email/password or SSO) and clicks Approve.
4. The browser displays an authorization code. The user copies it.
5. Call auth action pkce-complete with the code to exchange it for an access token.
6. The session is established automatically — all subsequent tool calls are authenticated.

Checking Session Status

• auth action status -- checks the local Durable Object session. No API call is made. Returns authentication state, user ID, email, and token expiry.
• auth action check -- validates the token against the Fast.io API. Returns the user ID if the token is still valid.

Session Expiry

JWT tokens last 1 hour. API keys (used when assisting a human) do not expire unless revoked. When a JWT session expires, tool calls return a clear error indicating that re-authentication is needed. Call auth action signin again to establish a new session. The MCP server does not auto-refresh tokens.

Tip: For long-running sessions, use auth action status to check remaining token lifetime before starting a multi-step workflow. If the token is close to expiring, re-authenticate first to avoid mid-workflow interruptions.

Signing Out

Call auth action signout to clear the stored session from the Durable Object.

3. Core Concepts

Organizations

Organizations are the top-level container in Fast.io. Every user belongs to one or more organizations. Organizations have:

• Members with roles: owner, admin, member, guest, view.
• Billing and subscriptions managed through Stripe integration.
• Workspaces that belong to the organization.
• Plan limits that govern storage, transfer, AI tokens, and member counts.

Organizations are identified by a 19-digit numeric profile ID or a domain string.

IMPORTANT: When creating orgs, agents MUST use org action create which automatically assigns billing_plan: "agent". This ensures the org gets the free agent plan (50 GB, 5,000 credits/month). Do not use any other billing plan for agent-created organizations.

Org Discovery (IMPORTANT)

To discover all available orgs, agents must call both actions:

1. org action list -- returns internal orgs where you are a direct member (member: true)
2. org action discover-external -- returns external orgs you access via workspace membership only (member: false)

An agent that only checks org action list will miss external orgs entirely and won't discover the workspaces it's been invited to. External orgs are the most common pattern when a human invites an agent to help with a specific project -- they add the agent to a workspace but not to the org itself.

Internal vs External Orgs

Internal orgs (member: true) -- orgs you created or were invited to join as a member. You have org-level access: you can see all workspaces (subject to permissions), manage settings if you're an admin, and appear in the org's member list.

External orgs (member: false) -- orgs you can access only through workspace membership. You can see the org's name and basic public info, but you cannot manage org settings, see other workspaces, or add members at the org level. Your access is limited to the specific workspaces you were explicitly invited to.

Example: A human invites your agent to their "Q4 Reports" workspace. You can upload files, run AI queries, and collaborate in that workspace. But you cannot create new workspaces in their org, view their billing, or access their other workspaces. The org shows up via org action discover-external -- not org action list. If the human later invites you to the org itself, the org moves from external to internal.

Workspaces

Workspaces are file storage containers within organizations. Each workspace has:

• Its own set of members with roles (owner, admin, member, guest).
• A storage tree of files and folders (storage nodes).
• Optional AI features for RAG-powered chat.
• Shares that can be created within the workspace.
• Archive/unarchive lifecycle management.
• 50 GB included storage on the free agent plan, with files up to 1 GB per upload.
• File versioning -- every edit creates a new version, old versions are recoverable.
• Full-text and semantic search -- find files by name, content, or meaning.

Workspaces are identified by a 19-digit numeric profile ID.

Intelligence: On or Off

Workspaces have an intelligence toggle that controls whether AI features are active:

Intelligence OFF -- the workspace is pure file storage. You can still attach files directly to an AI chat conversation (up to 20 files, 200 MB total), but files are not persistently indexed. This is fine for simple storage and sharing where you do not need to query your content.

Intelligence ON -- the workspace becomes an AI-powered knowledge base. Every file uploaded is automatically ingested, summarized, and indexed. This enables:

• RAG (retrieval-augmented generation) -- scope AI chat to entire folders or the full workspace and ask questions across all your content. The AI retrieves relevant passages and answers with citations.
• Semantic search -- find files by meaning, not just keywords. "Show me contracts with indemnity clauses" works even if those exact words do not appear in the filename.
• Auto-summarization -- short and long summaries generated for every file, searchable and visible in the UI.
• Metadata extraction -- AI pulls key metadata from documents automatically.

Intelligence defaults to ON for workspaces created via the API by agent accounts. If you are just using Fast.io for storage and sharing, disable it to conserve credits. If you need to query your content, leave it enabled.

Agent use case: Create a workspace per project or client. Enable intelligence if you need to query the content later. Upload reports, datasets, and deliverables. Invite the human stakeholders. Everything is organized, searchable, and versioned.

For full details on AI chat types, file context modes, AI state, and how intelligence affects them, see the AI Chat section below.

Shares

Shares are purpose-built spaces for exchanging files with people outside your workspace. They can exist within workspaces and have three types:

Share Features

• Password protection -- require a password for link access
• Expiration dates -- shares auto-expire after a set period
• Download controls -- enable or disable file downloads
• Access levels -- Members Only, Org Members, Registered Users, or Public (anyone with the link)
• Custom branding -- background images, gradient colors, accent colors, logos
• Post-download messaging -- show custom messages and links after download
• Up to 3 custom links per share for context or calls-to-action
• Guest chat -- let share recipients ask questions in real-time
• AI-powered auto-titling -- shares automatically generate smart titles from their contents
• Activity notifications -- get notified when files are sent or received
• Comment controls -- configure who can see and post comments (owners, guests, or both)

Two Storage Modes

When creating a share with share action create, the storage_mode parameter determines how files are stored:

• room (independent storage, default) -- The share has its own isolated storage. Files are added directly to the share and are independent of any workspace. This creates a self-contained data room -- changes to workspace files do not affect the room, and vice versa. Use for final deliverables, compliance packages, archived reports, or any scenario where you want an immutable snapshot.

• shared_folder (workspace-backed) -- The share is backed by a specific folder in a workspace. The share displays the live contents of that folder -- any files added, updated, or removed in the workspace folder are immediately reflected in the share. No file duplication, so no extra storage cost. To create a shared folder, pass storage_mode=shared_folder and folder_node_id={folder_opaque_id} when creating the share. Note: Expiration dates are not allowed on shared folder shares since the content is live.

Both modes look the same to share recipients -- a branded data room with file preview, download controls, and all share features. The difference is whether the content is a snapshot (room) or a live view (shared folder).

Shares are identified by a 19-digit numeric profile ID.

Agent use case: Generate a quarterly report, create a Send share with your client's branding, set a 30-day expiration, and share the link. The client sees a professional, branded page with instant file preview -- not a raw download link.

Storage Nodes

Files and folders are represented as storage nodes. Each node has an opaque ID (a 30-character alphanumeric string, displayed with hyphens, e.g. f3jm5-zqzfx-pxdr2-dx8z5-bvnb3-rpjfm4). The special value root refers to the root folder of a workspace or share, and trash refers to the trash folder.

Key operations on storage nodes: list, create-folder, move, copy, rename, delete (moves to trash), purge (permanently deletes), restore (recovers from trash), search, add-file (link an upload), and add-link (create a share reference).

Nodes have versions. Each file modification creates a new version. Version history can be listed and files can be restored to previous versions.

Notes

Notes are a storage node type (alongside files and folders) that store markdown content directly on the server. They live in the same folder hierarchy as files, are versioned like any other node, and appear in storage listings with type: "note".

Creating and Updating Notes

Create notes with workspace action create-note and update with workspace action update-note.

Creating: Provide workspace_id, parent_id (folder opaque ID or "root"), name (must end in .md, max 100 characters), and content (markdown text, max 100 KB).

Updating: Provide workspace_id, node_id, and at least one of name (must end in .md) or content (max 100 KB).

Notes as Long-Term Knowledge Grounding

In an intelligent workspace, notes are automatically ingested and indexed just like uploaded files. This makes notes a way to bank knowledge over time -- any facts, context, or decisions stored in notes become grounding material for future AI queries.

When an AI chat uses folder scope (or defaults to the entire workspace), notes within that scope are searched alongside files. The AI retrieves relevant passages from notes and cites them in answers.

Key behaviors:

• Notes are ingested for RAG when workspace intelligence is enabled
• Notes within a folder scope are included in scoped queries
• Notes with ai_state: ready are searchable via RAG
• Notes can also be attached directly to a chat via files_attach (if they have a ready preview)

Use cases:

• Store project context, decisions, and rationale. Months later, ask "Why did we choose vendor X?" and the AI retrieves the note.
• Save research findings in a note. Future AI chats automatically use those findings as grounding.
• Create reference documents (style guides, naming conventions) that inform all future AI queries in the workspace.

Other Note Operations

Notes support the same storage operations as files and folders: move (via storage action move), copy (storage action copy), delete/trash (storage action delete), restore (storage action restore), version history (storage action version-list), and details (storage action details).

Linking Users to Notes

• Note in workspace context (opens workspace with note panel): https://{domain}.fast.io/workspace/{folder_name}/storage/root?note={note_id}
• Note preview (standalone view): https://{domain}.fast.io/workspace/{folder_name}/preview/{note_id}

AI Chat

AI chat lets agents ask questions about files stored in workspaces and shares. Two chat types are available, each with different file context options.

AI chat is read-only. It can read, analyze, search, and answer questions about file contents, but it cannot modify files, change workspace settings, manage members, or access events. Any action beyond reading file content — uploading, deleting, moving files, changing settings, managing shares, reading events — must be done through the MCP tools directly. Do not attempt to use AI chat as a general-purpose tool for workspace management.

Two Chat Types

• chat — Basic AI conversation with no file context from the workspace index. Use for general questions only.
• chat_with_files — AI grounded in your files. Two mutually exclusive modes for providing file context:
  • Folder/file scope (RAG) — limits the retrieval search space. Requires intelligence enabled; files must be in ready AI state.
  • File attachments — files read directly by the AI. No intelligence required; files must have a ready preview. Max 20 files, 200 MB total.

Both types augment answers with web knowledge when relevant.

File Context: Scope vs Attachments

For chat_with_files, choose one of these mutually exclusive approaches:

Scope parameters (requires intelligence):

• folders_scope — comma-separated nodeId:depth pairs (depth 1-10, max 100 subfolder refs). Defines a search boundary — the RAG backend finds files within scoped folders automatically. Just pass folder IDs with depth; do not enumerate individual files. A folder with thousands of files and few subfolders works fine.
• files_scope — comma-separated nodeId:versionId pairs (max 100). Limits RAG to specific indexed files. Both nodeId AND versionId are required and must be non-empty — get versionId from the file's version field in storage action list or details responses.
• If neither is specified, the default scope is the entire workspace (all indexed files). This is the recommended default — omit scope parameters unless you specifically need to narrow the search.

Attachment parameter (no intelligence required):

• files_attach — comma-separated nodeId:versionId pairs (max 20, 200 MB total). Both nodeId AND versionId are required and must be non-empty. Files are read directly, not via RAG.

Do not list folder contents and pass individual file IDs as files_scope when you mean to search a folder — use folders_scope with the folder's nodeId instead. files_scope is only for targeting specific known file versions.

files_scope/folders_scope and files_attach are mutually exclusive — sending both will error.

Intelligence and AI State

The workspace intelligence toggle (see Workspaces above) controls whether uploaded files are auto-ingested, summarized, and indexed for RAG. When intelligence is enabled, each file has an ai_state indicating its readiness:

Only files with ai_state: ready are included in folder/file scope searches. Check file state via storage action details with context_type: "workspace".

When to enable intelligence: You need scoped RAG queries, cross-file search, auto-summarization, or a persistent knowledge base.

When to disable intelligence: The workspace is for storage/sharing only, or you only need to analyze specific files via attachments. Saves credits (ingestion costs 10 credits/page, 5 credits/sec for video).

Even with intelligence off, chat_with_files with file attachments still works.

How to Phrase Questions

With folder/file scope (RAG): Write questions likely to match content in indexed files. The AI searches the scope, retrieves passages, and cites them.

• Good: "What are the payment terms in the vendor contracts?"
• Good: "Summarize the key findings from the Q3 analysis reports"
• Bad: "Tell me about these files" — too vague, no specific content to match
• Bad: "What's in this workspace?" — cannot meaningfully search for "everything"

With file attachments: Be direct — the AI reads the full file content. No retrieval step.

• "Describe this image in detail"
• "Extract all dates and amounts from this invoice"
• "Convert this CSV data into a summary table"

Personality: The personality parameter controls the tone and length of AI responses. Pass it when creating a chat or sending a message:

• concise — short, brief answers
• detailed — comprehensive answers with context and evidence (default)

Use concise when you need a quick fact, a yes/no answer, or a brief summary. Use detailed (or omit the parameter) when you need thorough analysis with supporting evidence and citations. The personality can also be overridden per follow-up message.

Controlling verbosity in questions: You can also guide verbosity through how you phrase the question itself:

• "In one sentence, what is the main conclusion of this report?"
• "List only the file names that mention GDPR compliance, no explanations"
• "Give me a brief summary — 2-3 bullet points max"

Combining personality: "concise" with a direct question produces the shortest answers and uses the fewest AI credits.

Chat Parameters

Create a chat with ai action chat-create (with context_type: "workspace") or ai action chat-create (with context_type: "share"):

• type (required) — chat or chat_with_files
• query_text (required for workspace, optional for share) — initial message, 2-12,768 characters
• personality (optional) — concise or detailed (default: detailed)
• privacy (optional) — private or public (default: public)
• files_scope (optional) — nodeId:versionId,... (max 100, requires chat_with_files + intelligence). Both parts required and non-empty. Omit to search all files (recommended default).
• folders_scope (optional) — nodeId:depth,... (depth 1-10, max 100 subfolder refs, requires chat_with_files + intelligence). Folder scope = search boundary, not file enumeration. Omit to search all files (recommended default).
• files_attach (optional) — nodeId:versionId,... (max 20 / 200 MB, both parts required and non-empty, mutually exclusive with scope params)

Follow-up Messages

Send follow-ups with ai action message-send (with context_type: "workspace" or "share"). The chat type is inherited from the parent chat. Each follow-up can update the scope, attachment, and personality parameters.

Waiting for AI Responses

After creating a chat or sending a message, the AI response is asynchronous. Message states progress: ready → in_progress → complete (or errored).

Recommended: Call ai action message-read (with context_type: "workspace" or "share") with the returned message_id. The tool polls automatically (up to 15 attempts, 2-second intervals, ~30 seconds). If the response is still processing after that window, use event action activity-poll with the workspace/share ID instead of calling the read action in a loop — see Activity Polling in section 7.

Response Citations

Completed AI responses include citations pointing to source files:

• nodeId — storage node opaque ID
• versionId — file version opaque ID
• entries[].page — page number
• entries[].snippet — text excerpt
• entries[].timestamp — audio/video timestamp

Linking Users to AI Chats

Append ?chat={chat_opaque_id} to the workspace storage URL:

https://{domain}.fast.io/workspace/{folder_name}/storage/root?chat={chat_id}

Share AI Chats

Shares support AI chat with identical capabilities. All workspace AI endpoints have share equivalents accessible via ai actions with context_type: "share".

AI Share / Export

Generate temporary markdown-formatted download URLs for files that can be pasted into external AI tools (ChatGPT, Claude, etc.). Use ai action share-generate (with context_type: "workspace" or "share"). URLs expire after 5 minutes. Limits: 25 files maximum, 50 MB per file, 100 MB total.

Profile IDs

Organizations, workspaces, and shares are all identified by 19-digit numeric profile IDs. These appear throughout the tool parameters as workspace_id, share_id, org_id, profile_id, and member_id.

Most endpoints also accept custom names as identifiers:

QuickShares

QuickShares are temporary public download links for individual files in workspaces (not available for shares). They can be accessed without authentication. Expires in seconds from creation (default 10,800 = 3 hours, max 86,400 = 24 hours). Max file size: 1 GB. Each quickshare has an opaque identifier used to retrieve metadata and download the file.

File Preview

Files uploaded to Fast.io get automatic preview generation. When humans open a share or workspace, they see the content immediately -- no "download and open in another app" friction.

Supported preview formats:

• Images -- full-resolution with auto-rotation and zoom
• Video -- HLS adaptive streaming (50--60% faster load than raw video)
• Audio -- interactive waveform visualization
• PDF -- page navigation, zoom, text selection
• Spreadsheets -- grid navigation with multi-sheet support
• Code and text -- syntax highlighting, markdown rendering

Use storage action preview-url (with context_type: "workspace" or "share") to generate preview URLs. Use storage action preview-transform (with context_type: "workspace" or "share") for image resize, crop, and format conversion.

Agent use case: Your generated PDF report does not just appear as a download link. The human sees it rendered inline, can flip through pages, zoom in, and comment on specific sections -- all without leaving the browser.

Comments and Annotations

Humans and agents can leave feedback directly on files, anchored to specific content using the reference parameter:

• Image comments -- anchored to spatial regions (normalized x/y/width/height coordinates)
• Video comments -- anchored to timestamps with spatial region selection
• Audio comments -- anchored to timestamps or time ranges
• PDF comments -- anchored to specific pages with optional text snippet selection
• Threaded replies -- single-level threading only; replies to replies are auto-flattened to the parent
• Emoji reactions -- one reaction per user per comment; adding a new reaction replaces the previous one

Comments use JSON request bodies (Content-Type: application/json), unlike most other endpoints which use form-encoded data.

Listing comments: Use comment action list for per-file comments and comment action list-all for all comments across a workspace or share. Both support sort, limit (2-200), offset, include_deleted, reference_type filter, and include_total.

Adding comments: Use comment action add with profile_type, profile_id, node_id, and text. Optionally include parent_comment_id for replies and reference to anchor to a specific position.

Deleting comments: comment action delete is recursive -- deleting a parent also removes all replies. comment action bulk-delete is NOT recursive -- replies to deleted comments are preserved.

Linking users to comments: The preview URL opens the comments sidebar automatically. Deep link query parameters let you target a specific comment or position:

Workspace: https://{org.domain}.fast.io/workspace/{folder_name}/preview/{file_opaque_id}?comment={comment_id}

Share: https://go.fast.io/shared/{custom_name}/{title-slug}/preview/{file_opaque_id}?comment={comment_id}

Parameters can be combined -- e.g. ?comment={id}&t=45.5 to deep link to a video comment at a specific timestamp. In shares, the comments sidebar only opens if the share has comments enabled.

Agent use case: You generate a design mockup. The human comments "Change the header color" on a specific region of the image. You read the comment, see exactly what region they are referring to via the reference.region coordinates, and regenerate.

URL Import

Agents can import files directly from URLs without downloading them locally first. Fast.io's server fetches the file, processes it, and adds it to your workspace or share.

• Supports any HTTP/HTTPS URL
• Supports OAuth-protected sources: Google Drive, OneDrive, Dropbox
• Files go through the same processing pipeline (preview generation, AI indexing if intelligence is enabled, virus scanning)

Use upload action web-import with the source URL, target profile, and parent node ID. Use upload action web-status to check progress and upload action web-list to list active import jobs.

Security note: The upload action web-import instructs the Fast.io cloud server to fetch the URL -- not the agent's local environment. The Fast.io server is a public cloud service with no access to your local network, internal systems, or private infrastructure. It can only reach publicly accessible URLs and supported OAuth-authenticated cloud storage providers. This is functionally equivalent to the agent downloading a file and re-uploading it; the same data is transferred, just more efficiently since the server handles it directly. No internal or private data is exposed beyond what the agent could already access through its own network requests.

Agent use case: A user says "Add this Google Doc to the project." You call upload action web-import with the URL. Fast.io downloads it server-side, generates previews, indexes it for AI, and it appears in the workspace. No local I/O.

Ownership Transfer

The primary way agents deliver value: build something, then give it to a human. Also the recommended action when the agent plan runs out of credits and API calls start returning 402 Payment Required -- transfer the org to a human who can upgrade to a paid plan.

IMPORTANT: Account type restriction. The transfer/claim workflow (org actions transfer-token-create, transfer-token-list, transfer-token-delete, transfer-claim) is only available when the agent created an agent account (via auth action signup) and that agent account owns

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