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MCP Apps Extension

Extension ID: ext-apps
Project Name: MCP Apps
Release Date: January 2026
Protocol Version: 1.2.0
Technical Moniker: SEP-1865 (Standard Extension Proposal)

Core Identity

Analogy: The 'Monitor' for the AI's USB-C port; adds a visual layer to logic-driven tool calls.

An official extension to the Model Context Protocol that allows AI tools to return interactive HTML/JS user interfaces instead of just text.

Technical Architecture

MIME Type: text/html;profile=mcp-app
URI Scheme: ui://
Rendering Method: Sandboxed iframe isolation
Communication Bridge: JSON-RPC via postMessage

Capabilities

Bidirectional state updates
Streaming tool results to UI
Interactive human-in-the-loop forms

Security Model

Isolation

Mandatory allow-scripts without allow-same-origin to protect local files.

Audit Trail

All UI-to-Model messages are logged in the host's standard transport logs.

Moltbot Integration

Use Case: Media Control

Interactive sliders and playback controls for local Spotify/Home Automation skills.

Use Case: Visual Data

Renders live interactive charts for local financial data on the Mac Mini.

Use Case: System Management

Provides a 'Remote Desktop-lite' UI within messaging apps for system management.

Official Links

Documentation: MCP Apps Extension Docs
SDK Reference: TypeScript SDK
Specification: ext-apps GitHub

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