agent-droid-bridge

Agent Droid Bridge

Agent Droid Bridge is an MCP server that connects AI agents to Android devices and emulators over ADB. It is built for mobile automation, app testing, dynamic analysis, and reverse engineering: exposing the full surface of ADB as structured tools that any MCP-compatible AI client can call directly. If ADB can do it, an agent can do it.

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Note: Purpose-built tools return structured, minimal responses instead of raw XML dumps, keeping agent workflows fast and context consumption low, while keeping performance high.

Demo

The demo above runs through a few straightforward tasks to show what a connected agent can do, and this is just scratching the surface:

• Installs the Paint app, opens it, and draws a house by calculating pixel coordinates for the walls and roof
• Opens the device browser, searches for "MCP Wikipedia", navigates to the result page, and takes a screenshot
• Opens the Calculator, computes 1337 × 42, and extracts the result to the host machine
• Opens Contacts, creates a new entry with a name and phone number, and confirms it saved
• Opens the Calendar and schedules an appointment for a specific date
• Opens Settings and toggles dark mode
• Extracts the Calculator APK from the device to the host machine
• Installs Notepad, writes a one-sentence summary of every task completed, and takes a final screenshot

What it does

• Exposes 13 MCP tools covering screen capture, UI inspection, screen reading, element extraction, touch and swipe input, text entry, keycode events, app launching, and arbitrary ADB commands
• Auto-detects the connected device when only one is present; presents a device list and requires the user to choose when multiple are connected
• All commands parsed via shlex — no shell injection possible
• Runs over stdio, compatible with any MCP-capable AI client
• Purpose-built screen reading and element extraction tools return structured, minimal responses — a fraction of the size of a raw XML hierarchy — keeping agent context lean across long automation runs
• Two execution modes: unrestricted (default, with optional shell denylist) and restricted (allowlist-only — only explicitly permitted shell commands are allowed); set ADB_EXECUTION_MODE=restricted to enable
• Set ADB_ALLOW_SHELL=false to block all adb shell commands entirely, regardless of mode
• Add tool names to tools.denied in adb_config.yaml to hide specific MCP tools from the agent at server startup — all filtering enforced at the server level

Install

uvx agent-droid-bridge

No cloning or virtual environments needed. Requires Python 3.11+ and ADB installed on your host.

uvx is provided by uv. If you don't have it: curl -LsSf https://astral.sh/uv/install.sh | sh

To install from source instead, see docs/setup.md — Option B.

To verify the install: uvx agent-droid-bridge --help

Quick start

1. Install ADB — see docs/setup.md for platform-specific instructions
2. Connect an Android device or start an emulator
3. Add the server to your MCP client config:

{
  "mcpServers": {
    "agent-droid-bridge": {
      "command": "uvx",
      "args": ["agent-droid-bridge"],
      "env": {
        "ADB_EXECUTION_MODE": "unrestricted",
        "ADB_ALLOW_SHELL": "true"
      }
    }
  }
}

1. Prompt your agent to use the agent-droid-bridge MCP tools

Full setup guide: docs/setup.md

Tools

Tool	What it does
get_ui_hierarchy	Returns the current screen as an XML UI hierarchy
take_screenshot	Captures the screen as a base64-encoded PNG
tap_screen	Sends a tap gesture at pixel coordinates
swipe_screen	Sends a swipe gesture between two points over a given duration
type_text	Types text into the focused input field
press_key	Sends an Android keycode event (Back, Home, Enter, etc.)
launch_app	Launches an app by its package/activity component name
execute_adb_command	Runs an arbitrary ADB or ADB shell command
list_devices	Lists all Android devices currently visible to ADB with their serial, state, and model
snapshot_ui	Takes a lightweight UI snapshot and returns a token for use with detect_ui_change
detect_ui_change	Polls for a UI change after an action; accepts a snapshot token as baseline; returns hierarchy only when requested
get_screen_elements	Parses the UI hierarchy and returns structured elements with coordinates and interaction properties; supports tappable, interactive, input, and all modes
get_screen_text	Returns all visible text on screen sorted top-to-bottom, as plain text

Full parameter reference: docs/tools.md

Configuration

The server is configurable via adb_config.yaml and environment variables. Tuneable parameters include the ADB binary path, command timeouts, log level, execution mode, shell filtering rules, and tool visibility. Full reference: docs/configuration.md.

Documentation

File	Description
docs/setup.md	Prerequisites, installation, and MCP client configuration
docs/tools.md	Full parameter reference for all 13 tools
docs/configuration.md	Reference for adb_config.yaml and environment variables

Contributing

Contributions are welcome. See CONTRIBUTING.md for guidelines on setup, code standards, and submitting pull requests.

To report a security vulnerability, follow the process in SECURITY.md — do not open a public issue.

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