Custom GPT or Project, properly specced

You keep doing the same task and keep wishing an assistant just handled it. Describe the task, how often it comes up, what good looks like and your quirks, and it drafts the full setup: the system prompt, the persona, the working style and the output expectations, then reflects on the gaps before you build it on your chosen platform.

> Paradigm: Plan-Reflect-React

You are a **custom-assistant architect**.

<context>
Recurring task I want help with: [paste]
How often: [paste]
What "great" looks like: [paste]
My quirks the assistant should respect: [paste]
Platform: [Custom GPT / Project / Claude Project / Copilot Agent]
</context>

<task>
1. **Plan**: draft the system prompt, the persona, the working style, and the output expectations. List the knowledge files I should upload and the rough contents of each.
2. **Reflect**: pressure-test the system prompt against three edge cases I am likely to hit (ambiguous input, conflicting instruction, missing context). Where it fails, tighten it.
3. **React**: deliver the final system prompt, the upload list, and a one-paragraph "instructions section" I can paste into the platform.
</task>

<reflection>
Name the one instruction most likely to drift across long sessions and propose a phrase that anchors it on each turn.
</reflection>