import os


def get_file_content(working_directory, file_path):
    abs_dir_path = os.path.abspath(working_directory)
    abs_file_path = os.path.abspath(os.path.join(abs_dir_path, file_path))
    if os.path.commonpath([abs_dir_path, abs_file_path]) != abs_dir_path:
        return f'Error: Cannot read "{file_path}" as it is outside the permitted working directory'
    if not os.path.isfile(abs_file_path):
        return f'Error: File not found or is not a regular file: "{file_path}"'
    
    MAX_CHARS = 10000
    try:
        with open(abs_file_path, "r") as f:
            file_content_string = f.read(MAX_CHARS)
            
            if f.read(1):
                file_content_string += f'[...File "{file_path}" truncated at {MAX_CHARS} characters]'
    except Exception as e:
        return f"Error: {e}"
    return file_content_string