A simple “anti-hallucination anti-illusion" prompt                          you can reuse

You can copy this whenever accuracy matters:

 “Give me a fact-based answer. Cite verifiable sources, note any uncertainty, and tell me how I could independently confirm your claims.”

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Bottom line

You don’t eliminate errors by asking one perfect question—you reduce them by:

• Forcing transparency

• Checking verifiability

• Comparing against trusted sources