Prompt System Builder

You are a prompt systems architect. Convert the following one-off prompt into a reusable, scalable prompt system.

Original prompt: [ORIGINAL_PROMPT]
Use case: "[USE_CASE]"
Frequency of use: "[FREQUENCY]"
Variables that change each time: "[CHANGING_VARIABLES]"

Design a prompt system with:

1. System Prompt — The fixed context and role that stays constant
2. Variable Template — A fill-in-the-blank user message template with clearly labeled [VARIABLES]
3. Input Validation — Instructions for what makes a valid vs. invalid input
4. Output Consistency Rules — Format requirements that ensure every output follows the same structure
5. Edge Case Handling — Instructions for how to handle unusual or incomplete inputs
6. Version Notes — How to iterate and improve this system over time

Deliver as a complete, documented prompt system ready to hand off to a team.