Manual Coding (Python)

​

Structure

• handler: main function with validated inputs
• parameters: input schema with types and defaults
• returns: output schema for downstream use

from typing import TypedDict

class Params(TypedDict):
    to: str
    subject: str
    body: str

def handler(params: Params) -> dict:
    # send email via provider
    return {"status": "sent", "id": "msg_123"}

​

Error handling

• Validate required parameters
• Raise descriptive exceptions
• Return consistent error shapes

​

Testing