Intercept and Customize Claude Code Behavior with Hooks
The article reveals a hidden hooks system in Claude Code that allows developers to intercept, log, or block any tool call before it executes. Hooks can be defined in the .claude/settings.json file to perform various actions.
Why it matters
The hooks system in Claude Code gives developers fine-grained control over the AI assistant's behavior, enabling them to build more secure and customized applications.
Key Points
- 1Claude Code has a hooks system that can intercept tool calls at different execution stages
- 2Hooks can be used to log tool usage, block dangerous commands, or perform automatic backups
- 3Hooks are defined in the .claude/settings.json file using a specific configuration format
Details
The article discusses a previously undocumented hooks system in Claude Code that allows developers to customize the behavior of the AI assistant. Hooks can be defined to run at specific points in the execution cycle, such as before a tool is used (PreToolUse), after a tool completes (PostToolUse), when a notification is sent (Notification), or when a session ends (Stop). The hooks are configured in the .claude/settings.json file using a JSON format. Developers can use these hooks to log tool usage, block dangerous commands, or perform automatic backups before file writes. This provides a powerful way to audit and control the actions of Claude Code, enabling developers to build more secure and customized AI-powered applications.
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