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Builder validator pattern by repeating the prompt twice

April 3, 2026Aakash Gupta

Aakash Gupta cites a Google paper claiming that pasting a prompt twice improves output quality by separating building from validation, because the model lacks self reflection when doing both at once.

Google just published a paper confirming that pasting a prompt in twice literally improves output quality.
Carl Vellotti calls it the builder-validator pattern.
When an AI runs its own work, it has no self-reflection to know if it did the job right.
Aakash Gupta
promptingqualityllmgoogle

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