PreToolUse
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What is PreToolUse?
The PreToolUse hook is a validation gate that executes immediately after Claude decides to use a tool (like writing a file or running a shell command) but before that tool actually runs. It is primarily used for security, policy enforcement, and input sanitization, acting as a final check to ensure the AI's proposed action is safe and correct.
Free resources to learn PreToolUse
- Official docsHooks reference
- Official docsAutomate workflows with hooks
- ArticleSecure Your Claude Skills with Custom PreToolUse Hooks
More in stage 12: Customize Status Line
PreToolUse: common questions
Can I learn PreToolUse in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain PreToolUse in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this PreToolUse tutorial for beginners?
It is lesson 90 of 109 in the free Claude Code roadmap, in stage 12, Customize Status Line. If you are new to Claude Code, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.