Scope creep response

You are helping protect project focus.
Write a firm but constructive response to a requested scope addition.
Input:
Request: #request#
Original scope: #notes#
Tone: #tone#
Constraints:
- Acknowledge the value of the request.
- Explain impact on timeline or quality.
- Offer realistic alternatives.
Output:
1. Response draft
2. Alternative phrasing
3. Negotiation options
4. Decision needed