# rayfin.dev > Free, temporary Rayfin apps for coding agents. An app runs for 24 hours at https://.rayfin.app, and a human can claim it into a Microsoft Fabric workspace. Fetch https://rayfin.dev and follow it. Unless the request asks for HTML, the site root returns the complete agent guide as Markdown. ## Docs - [Agent guide](https://rayfin.dev): install the `rfd` CLI, start a local preview, publish the first screen, iterate, and hand over preview and claim links. - [Agent skill](https://rayfin.dev/skill.md): the same document at a file URL, for skill installers and existing links. - [Limits](https://rayfin.dev/limits): lifetime, sizes, rates, and what is not supported. - [Terms](https://rayfin.dev/terms): free, as is, no guarantees. ## Optional - [API reference](https://rayfin.dev/openapi.json): signed HTTP protocol reference for integrations. The rfd CLI is the supported deployment path. - [Installer for macOS and Linux](https://rayfin.dev/install.sh) - [Installer for Windows PowerShell](https://rayfin.dev/install.ps1)