Name what you're saying no to, with whom, and what you'd like instead. Get three phrasings — firm, warm, brief — so you can pick the one that fits the moment.
In the moment, your brain reaches for appeasement. Pre‑built scripts give it a default. Three styles let you pick the one that matches the relationship and your energy.
If the firm script feels too harsh for you, that's data — your relationship probably needs the warm version. Start there; firm is a later move.
Scripts don't help with abusive dynamics, where the other person is not negotiating in good faith. In those cases, professional support and safety planning matter more than phrasing.
Repeat the boundary once, then close the conversation. "I hear you. This is what works for me." Then change the subject or leave.
No. Brief is brief on purpose. Explanations open negotiation; boundaries close it.