Enhanced ADB MCP Server

Instructions

Implementation Reference

• src/adb_mcp_server/server.py:977-981 (handler)

  The handler function for the MCP tool 'read_file'. Decorated with @mcp.tool() which registers the tool and automatically generates input/output schema from type hints. Executes 'adb shell cat' on the remote_path to read the file content.

  @mcp.tool()
  def read_file(remote_path: str, device_serial: str | None = None) -> str:
      """Read a text file from the device"""
      return run_adb(["shell", "cat", remote_path], device_serial)

• src/adb_mcp_server/server.py:24-39 (helper)

  Supporting utility function that runs ADB commands with optional device serial and timeout handling. Called by read_file to execute the 'adb shell cat' command.

  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 to which all tools including 'read_file' are registered via decorators.

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