Message A Model - How to eliminate "--", This is your caption, etc.

Hi! I have a lot of nice photos, and have modified one of

's setups to write social media captions based on the photo's title, in batches of 10. Eventually I will add the auto-posting to Socials.

My problem: I have Claude hooked for the Message a Model node with Critical Rules in my prompt (see below), and I would say 25% of the time the node still adds: "---", "Here are caption options" & other preamble's. I also have Claude Cleanup Node after it. Has anyone found a solution to this? Or, do I just need to deal with it for now?

CRITICAL RULES:

1. Your response must be ONLY the caption text

2. Do NOT include "Caption:", "---", or any labels

3. Do NOT include "Here's a caption" or any preamble

4. Do NOT include asterisks or markdown formatting

5. Start IMMEDIATELY with the first word of the actual caption

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