Micro Fabric

Preview Claimable Rayfin apps for AI agents

Your agent ships it. You claim it.

Micro Fabric puts your coding agent's Rayfin app online in seconds, with no sign-up and no Fabric workspace. Share the live link right away; when you want to keep the app, claim it and deploy the same project to Microsoft Fabric.

Build me a simple todo app using https://micro-fabric.com

Paste it into GitHub Copilot, Claude Code, Codex or any coding agent.

Coding agent

Build me a simple todo app using https://micro-fabric.com

Deployed with Micro Fabric

  • Compile
  • Build app
  • Upload
  • Go live

swift-otter-42 is live

App
https://swift-otter-42.apps.micro-fabric.com
Claim
https://micro-fabric.com/claim/app_8x2kq7m4p9r3t5v1#token=…
Owner
owner · ••••••••••••
Expires
in 72 hours · extend up to 14 days

For AI agents

llms.txt

Fetch https://micro-fabric.com/llms.txt and follow it: it creates a Rayfin project, runs it locally with serve, deploys it with deploy and signs in with a one-time link. Its steps replace the Microsoft Fabric ones in Rayfin's docs: no rayfin login, no account, no Fabric workspace.

In a Rayfin project, deploy with

npx --yes --@micro-fabric:registry=https://mfnpmkeru5mndfxggs.z20.web.core.windows.net/ @micro-fabric/cli deploy --json

Node.js 22.12 or newer. Run it exactly as shown: npx micro-fabric without the scope is an unrelated package.

How it works

From a prompt to a link you can share

  1. Ask your agent

    Paste the prompt. Your agent creates a Rayfin project, writes the app and builds it on your machine.

  2. It's live in seconds

    One command deploys it to <slug>.apps.micro-fabric.com, with a database of its own. A one-time link opens it signed in as you.

  3. Claim it, keep it

    Your agent hands you a secret claim link. Extend the app and download the project, then deploy it to Microsoft Fabric with npx rayfin up.

What you get

A live app now, a Fabric app later

  • A live app

    At <slug>.apps.micro-fabric.com, on a real Rayfin backend: the stock Rayfin 1.36 SDK works unchanged, with data, sign-in, file storage and functions.

  • A claim page

    A secret link to run the app: extend it up to 14 days, reset the owner password, open or close sign-ups, check its Fabric readiness, download or delete it.

  • A Fabric-ready project

    A zip with the source, a JSON export of the data and the stored files. It deploys unchanged to Microsoft Fabric with npx rayfin up.

Why Micro Fabric

A real Rayfin backend, minus the setup

  • Instant

    No sign-up, no account, no workspace. One command returns the app URL, a claim link and the owner's sign-in.

  • Isolated data

    Every app gets a database of its own. Entities become tables, and policies filter every read and write, as on Fabric.

  • Sandboxed functions

    Rayfin functions run in a sandbox of the app's own, with per-app limits and the secrets you set, stored encrypted.

  • Your data, exportable

    The project download includes a JSON export of the data and the stored files. Nothing is locked in.

  • Fabric parity checks

    Every deploy checks the app against Microsoft Fabric and flags what would break there, long before you move it.

  • Private by default

    No cookies and no tracking. Builds run on your machine, and only the claim link can manage the app.

Limits per app

  • 72 hours until it expires; extend it up to 14 days
  • 100 MB of data
  • 100 MB of files, 25 MB per file
  • 60 seconds per function call

FAQ

Questions, answered

Anything else? The Rayfin docs cover the framework, and llms.txt has every detail of the service.

How long does an app live?

72 hours after its first deploy. Each extension adds 72 hours, up to 14 days after it was created: extend it from the claim page, or ask your agent. Then the app and its data are deleted, so download the project before it expires.

What does claiming do?

Your agent gives you the app's claim link. It opens a page where you can extend the app, reset the owner password, open or close sign-ups, download the project or delete the app. There is no account: whoever has the link controls the app, so keep it private. To keep the app for good, deploy the project to Microsoft Fabric with npx rayfin up.

What are Rayfin and Microsoft Fabric?

Rayfin is a backend platform for TypeScript developers: you describe your data as TypeScript classes, and it generates the database, the APIs and typed clients, with sign-in, functions, storage and hosting built in. Rayfin apps run on Microsoft Fabric, which needs a workspace with capacity and a Microsoft Entra sign-in. Micro Fabric runs the same apps without either, so your agent can put one online right away.

How is it different from Microsoft Fabric?
Micro Fabric Microsoft Fabric
Sign-in Username and password, one-time links Microsoft Entra ID
Database One database per app Fabric SQL database
Functions 60 seconds per call Up to 250 seconds per call
File storage 100 MB per app Experimental
Connectors Not available Available
Which coding agents can use it?

Any coding agent that can run commands on your machine with Node.js 22.12 or newer, such as GitHub Copilot, Claude Code or Codex. They follow the instructions at https://micro-fabric.com/llms.txt.

What about privacy and abuse?

This site sets no cookies and does no tracking. Apps are on the public internet, and anyone can sign up to a deployed app until you close sign-ups on its claim page. To report an app, contact sachin.patney@gmail.com: the operators can take apps down.

Ready when your agent is

Copy the prompt, paste it into your coding agent and share a live Rayfin app.

Read llms.txt