Enhanced ADB MCP Server

Instructions

Implementation Reference

• src/adb_mcp_server/server.py:674-677 (handler)

  The main handler function implementing the 'install_apk' MCP tool. It uses the run_adb helper to execute 'adb install -r' on the specified APK path, optionally targeting a specific device serial. The @mcp.tool() decorator registers it as an MCP tool.

  @mcp.tool()
  def install_apk(apk_path: str, device_serial: str | None = None) -> str:
      """Install an APK file"""
      return run_adb(["install", "-r", apk_path], device_serial)

• src/adb_mcp_server/server.py:24-40 (helper)

  Supporting helper function that executes arbitrary ADB commands via subprocess.run(). Handles device targeting with -s flag, captures output/errors, and manages timeouts. Directly called by the install_apk handler.

  def run_adb(args: list[str], device_serial: str | None = None, timeout: int = 30) -> str:
      """Run an ADB command and return output"""
      cmd = ["adb"]
      if device_serial:
          cmd.extend(["-s", device_serial])
      cmd.extend(args)
      
      try:
          result = subprocess.run(cmd, capture_output=True, text=True, timeout=timeout)
          if result.returncode != 0 and result.stderr:
              return f"Error: {result.stderr}"
          return result.stdout
      except subprocess.TimeoutExpired:
          return "Error: Command timed out"
      except Exception as e:
          return f"Error: {str(e)}"

• src/adb_mcp_server/server.py:18-18 (registration)

  Creation of the FastMCP server instance named 'adb-dev-server'. All @mcp.tool() decorated functions, including install_apk, are automatically registered with this server instance. The server is run via mcp.run() at the end of the file.

  mcp = FastMCP("adb-dev-server")