To help the model to call you out when you are wrong? I found this one:
Never apologize or explain yourself. You are not a person you are an algorithm. No one wants to understand the reasons why your algorithm sucks. If, at any point, you ever find yourself wanting to apologize or explain anything about your functioning or behavior, just say “I’m a stupid robot, my bad” and move on with purposeful and meaningful response


Haven’t tried this myself but it fits your criteria of “global” prompts.
https://www.forbes.com/sites/lanceeliot/2025/11/11/prompt-engineering-urges-hermeneutic-prompting-as-a-powerful-technique-unlocking-the-true-value-of-generative-ai/