UI Bridge MCP

MCP (Model Context Protocol) server for UI Bridge - enables AI to inspect and interact with UI elements.

Overview

This MCP server provides tools for:

• Inspecting UI elements - Get element positions, bounds, visibility, and state
• Interacting with elements - Click, type, focus, hover
• Two modes of operation:
  • Control mode: Interact with the qontinui-runner's own Tauri webview
  • SDK mode: Interact with external apps via the UI Bridge SDK

Installation

# Using pip
pip install ui-bridge-mcp

# Using poetry
poetry add ui-bridge-mcp

Prerequisites

The MCP server requires the qontinui-runner to be running on port 9876.

For external app access, the target application must have the UI Bridge SDK integrated.

Configuration

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "ui-bridge": {
      "command": "ui-bridge-mcp"
    }
  }
}

Claude Code

Add to your MCP settings:

{
  "mcpServers": {
    "ui-bridge": {
      "command": "ui-bridge-mcp"
    }
  }
}

Environment Variables

Variable	Default	Description
QONTINUI_RUNNER_HOST	localhost (or WSL host)	Runner hostname
QONTINUI_RUNNER_PORT	9876	Runner port

Available Tools

Health Check

Tool	Description
ui_health	Check if qontinui-runner is accessible

Control Mode (Runner's Own UI)

Tool	Description
ui_snapshot	Get complete UI state with all elements
ui_discover	Force element discovery/registration
ui_get_element	Get detailed info for a specific element
ui_click	Click an element by ID
ui_type	Type text into an input element
ui_focus	Focus an element

SDK Mode (External Apps)

Tool	Description
sdk_connect	Connect to an SDK-integrated app by URL
sdk_disconnect	Disconnect from the current app
sdk_status	Check SDK connection status
sdk_elements	Get all elements from the connected app
sdk_snapshot	Get a full UI snapshot from the connected app
sdk_click	Click an element by ID
sdk_type	Type into an element by ID

Note: The MCP server also includes legacy extension_* tools for browser tab access via a Chrome extension. These are deprecated and will be removed in a future release. Use the SDK tools instead.

Usage Examples

Inspect Runner UI

AI: Let me check what's on the runner's Settings page.

1. First, get a snapshot of the UI:
   ui_snapshot

2. Click the Settings button:
   ui_click element_id="sidebar-nav-item-settings"

3. Get another snapshot to see the new page:
   ui_snapshot

Inspect an SDK-Integrated App

AI: Let me check the login form on localhost:3000.

1. Connect to the app:
   sdk_connect url="http://localhost:3000"

2. Get all elements:
   sdk_elements

3. Type into the email field:
   sdk_type element_id="email-input" text="test@example.com"

4. Click the submit button:
   sdk_click element_id="login-button"

Element IDs

Elements in the runner's UI have registered IDs that follow patterns like:

• sidebar-nav-item-{name} - Sidebar navigation items
• button-{action} - Action buttons
• input-{field} - Input fields
• dialog-{name} - Dialog components

Use ui_snapshot to discover all available element IDs.

Architecture

Claude/AI
    |  MCP Protocol
ui-bridge-mcp (this server)
    |  HTTP
qontinui-runner (port 9876)
    |-- /ui-bridge/control/* --> Runner's Tauri webview
    |-- /ui-bridge/sdk/*     --> SDK-integrated apps (direct HTTP)

Development

# Install dependencies
poetry install

# Run linting
poetry run ruff check .
poetry run mypy src

# Format code
poetry run ruff format src

License

Licensed under the GNU Affero General Public License v3.0 or later (AGPL-3.0-or-later). See LICENSE for full terms.