Python code for the skill execution. Must contain a run() function as the entry point.
The function signature will be automatically analyzed to extract parameter schema.
Use type annotations to specify parameter types and descriptions.

For secrets, use Secret("secret_name") to reference secrets configured via /secrets APIs.
For files, use Annotated[File, "description"] to accept file uploads.
For regular parameters, use Annotated[type, "description"].

Example:

from typing import Annotated
import requests

def run(api_key: Annotated[str, Secret("gmail_api_key")],
        input_file: Annotated[File, "CSV file to process"],
        to_email: Annotated[str, "Recipient email address"]) -> str:
    # Implementation here
    with open(input_file) as f:
        data = f.read()
    return "File processed and email sent successfully"

For generated skills: set to null to revert to the original generated code.