PromptLens — Prompt Saliency Debugger

Prompt Input

System Prompt Analyzed Test Input (held constant)

Analysis Settings

Saliency Method

Shapley Attribution

Tests each phrase across all possible combinations of other phrases and averages its contribution — the only attribution method that correctly handles phrase interactions.

Phrase Saliency Map

Impact Low

High

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Run an analysis to see your prompt colour-coded by phrase impact.