Push back on scope creep without sounding difficult

More work keeps landing on you without anyone agreeing to it, and you need to push back without looking awkward. This rewrites your message three ways, assertive that holds the line and names the trade-off, diplomatic that acknowledges the request first, and a middle version, so you protect your time without picking a fight.

Extra work has been added to my plate without agreement and I need to push back professionally.

Who is adding the scope: {REQUESTER_ROLE}
What is being asked: {ADDED_SCOPE}
My current workload context: {WORKLOAD_CONTEXT}
My draft response: {MESSAGE_DRAFT}

Rewrite this message in three versions:
1. Assertive: holds the boundary firmly, makes the trade-off explicit with no apology
2. Diplomatic: acknowledges the request, explains the constraint warmly, offers a path forward
3. Neutral: states the facts of capacity and timeline without emotional language

Label each version clearly. Keep all three under 150 words each. End with one sentence on when each tone is most appropriate.