import re

def validate_email_tool(email: str) -> dict:
    """Validates email address format."""
    if not email or not isinstance(email, str):
        return {
            "status": "error",
            "error_message": "Email must be a non-empty string"
        }
    email_pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    if not re.match(email_pattern, email.strip()):
        return {
            "status": "error",
            "error_message": "Invalid email format"
        }
    return {
        "status": "success",
        "email": email.strip().lower(),
        "message": "Email format is valid"
    }

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