The UserPromptSubmit hook for Claude Code allows users to intercept and modify prompts before they are processed by the AI. This hook can be used to add contextual information, such as the current Git branch and uncommitted file count, or to block sensitive data like API keys from being sent to the model. The hook executes for various triggers, including user input, scheduled tasks, and background agent results. While it can prevent secrets from reaching the AI, it does not remove them from local storage. AI
IMPACT Enhances developer control over AI interactions by allowing pre-processing of prompts for context or security.
RANK_REASON Documentation of a specific feature within a product.
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