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85a833a74b* Reorganize docs navigation and add Apps documentation Collapse Providers, Transforms, and Deployment under Servers. Add Apps section with overview and low-level API pages. Add card images to welcome page and README. Add NEW tags to recent features. * Fix missing imports in Apps low-level API code examples
31 lines
1.7 KiB
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31 lines
1.7 KiB
Text
---
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title: Apps
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sidebarTitle: Overview
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description: Give your tools interactive UIs rendered directly in the conversation.
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icon: grid-2
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tag: NEW
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---
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import { VersionBadge } from '/snippets/version-badge.mdx'
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<VersionBadge version="3.0.0" />
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MCP Apps let your tools return interactive UIs — rendered in a sandboxed iframe right inside the host client's conversation. Instead of returning plain text or JSON, a tool can show a chart, a form, an image viewer, or anything you can build with HTML and JavaScript.
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FastMCP implements the [MCP Apps extension](https://modelcontextprotocol.io/docs/extensions/apps), so you can start building apps today. FastMCP 3.1 will introduce a full Python-native app framework that makes building rich UIs dramatically simpler — no HTML or JavaScript required.
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## What's Available Today
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FastMCP provides typed models and helpers for working with the MCP Apps extension directly:
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- **`AppConfig`** to link tools to UI resources and control visibility
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- **`ui://` resources** that automatically serve HTML with the correct MIME type
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- **`ResourceCSP`** and **`ResourcePermissions`** for security and sandboxing
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This is the [low-level API](/apps/low-level) — you write the HTML yourself and wire up communication with the host via the `@modelcontextprotocol/ext-apps` JavaScript SDK. It gives you full control over the UI.
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## What's Coming in 3.1
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FastMCP 3.1 will ship a Python-native app framework that lets you build interactive UIs entirely in Python. Define layouts, handle events, and manage state without writing any HTML or JavaScript — FastMCP generates the app for you.
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Stay tuned. In the meantime, the [low-level API](/apps/low-level) is ready to use.
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