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Book Overview & Buying
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Table Of Contents
Agentic Coding with Claude Code
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Hooks are a powerful feature in Claude Code. They are automatic logic that runs at specific points during Claude Code's workflow.

Figure 3.9 – Hook configuration and security warning in Claude Code
For example, hooks can run before or after a tool is used, or when Claude finishes working. They help automate tasks such as formatting code, running tests, or blocking unsafe edits. By doing this, hooks ensure that these actions happen consistently without manual intervention.
Hooks are a key part of building reliable workflows, and we will spend a significant amount of time working with them hands-on later in the book. To give a brief preview, hooks can also be used to trigger Claude's sub-agents. Each sub-agent runs with its own context and its own set of tools, which opens the door to more complex and powerful workflows.
Let us now configure our first hook. In this section, we will build a simple notification hook...