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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Purpose-built tools return structured, minimal responses. No raw XML dumps, no wasted context — agents stay fast across long sessions.

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

Tools

• 14 built-in tools for screen capture, UI inspection, text reading, element extraction, touch and swipe input, text entry, keycode events, app launching, ADB commands, and device inspection
• app_manager pack adds 9 tools for package management, app lifecycle, APK extraction, permissions, and intent injection. Load it with ADB_EXTRA_TOOL_PACKS=app_manager
• Tool availability is reflected in the server's startup instructions. Agents receive an accurate catalog at connect time

Device handling

• Auto-detects a single connected device; prompts for selection when multiple devices are present
• Runs over stdio, compatible with any MCP-capable AI client
• Structured responses instead of raw XML dumps, keeping agent context lean across long automation runs

Security

• Two execution modes: unrestricted (full ADB access, optional denylist) and restricted (allowlist-only, blocks everything not explicitly permitted)
• Set ADB_ALLOW_SHELL=false to disable all shell commands regardless of mode
• Hide specific tools from the agent with ADB_DENIED_TOOLS
• All commands parsed via shlex. No shell injection possible

Observability

• Optional session recorder logs every tool call, ADB command, and security event to structured JSONL files. Enable with MCP_LOG_ENABLED=true and MCP_LOG_DIR

Use cases

Mobile QA and test automation Automate UI flows across real devices and emulators without modifying the app or writing test code. Tap, swipe, type, read screen content, take screenshots — all from a natural language prompt.

App security research Extract APKs, inspect declared permissions, fire arbitrary intents, and observe runtime behavior on screen. No instrumentation, no jailbreak required.

Dynamic analysis Launch apps in controlled states, drive UI interactions, capture screen state at each step, and pull artifacts — all scriptable through an AI agent.

Development and debugging Install builds, verify UI states, check app info, and run ADB commands without leaving your coding environment.

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",
        "ADB_PATH": "adb",
        "ADB_EXTRA_TOOL_PACKS": "",
        "MCP_LOG_ENABLED": "false",
        "MCP_LOG_DIR": "~/logs/agent-droid-bridge"
      }
    }
  }
}

To enable session logging, set MCP_LOG_ENABLED to "true" and update MCP_LOG_DIR to a writable path on your machine.

Variable	Default	Description
ADB_EXECUTION_MODE	unrestricted	Security mode. unrestricted allows all shell commands (with optional denylist); restricted allows only commands in ADB_SHELL_ALLOWLIST.
ADB_ALLOW_SHELL	true	Set to false to block all adb shell commands regardless of execution mode.
ADB_PATH	adb	Path to the ADB binary. Replace with a full path if adb is not on your system PATH (e.g. C:\platform-tools\adb.exe on Windows).
ADB_EXTRA_TOOL_PACKS	(empty)	Comma-separated list of extra tool packs to load. Set to app_manager to enable 9 additional app management tools.
MCP_LOG_ENABLED	false	Set to true to enable session logging. Requires MCP_LOG_DIR.
MCP_LOG_DIR	(none)	Directory where session logs are written. Required when MCP_LOG_ENABLED is true.

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

Full setup guide and environment variable reference: 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
check_device_capabilities	Returns structured device information — identity, security posture, and hardware specs — in a single call; supports identity, security, hardware, and all modes

Extra tool packs

Optional packs extend the core toolset. Enable them by setting ADB_EXTRA_TOOL_PACKS in your MCP client config. See docs/extra-tool-packs.md.

app_manager

Package management, app lifecycle control, APK extraction, permission management, and intent injection.

Tool	What it does
list_packages	Lists installed packages with optional filtering, search, and detail levels
get_app_info	Returns full static metadata for a single installed app
install_app	Installs an APK from a host path onto the device
uninstall_app	Removes an installed app by package name
pull_apk	Extracts the installed APK from the device to the host
manage_permission	Grants, revokes, checks, or lists runtime permissions for an app
launch_app_extra	Launches an app by package name, auto-resolving the launcher activity
manage_app	Controls app runtime state — stop, clear data, clear cache, enable, disable
inject_intent	Fires an intent at a component via am start, am broadcast, or am startservice

Full parameter reference: docs/tools.md

Configuration

Configure the server entirely from your MCP client's env block. No files to edit. The env block in the Quick Start above covers the most common settings. For the full reference including security filtering, tool visibility, and timeouts, see docs/configuration.md.

To use a YAML config file instead, set ADB_CONFIG_SOURCE=yaml. See docs/configuration.md for details.

Session recording is separate. Enable it with MCP_LOG_ENABLED=true and MCP_LOG_DIR. Full reference: docs/logging.md.

Documentation

File	Description
docs/setup.md	Prerequisites, installation, and MCP client configuration
docs/tools.md	Full parameter reference for all tools
docs/configuration.md	Reference for environment variables and adb_config.yaml
docs/logging.md	Session recorder — log files, levels, retention, and activation
docs/extra-tool-packs.md	Extra tool packs — enabling packs, the pack contract, and writing your own
docs/troubleshooting.md	Common setup issues and ADB problems
docs/workflows.md	Common multi-tool workflows with examples
CHANGELOG.md	Release history and version changes

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.