CLAUDE.md files are cool. You write instructions, Claude reads them, and most of the time it follows them. But “most of the time” can be a problem. When Claude gets deep into a complex task, it sometimes forgets to run tests before committing, or edits a file it shouldn’t touch, or skips a validation step you explicitly asked for. Hooks solve this problem by giving you deterministic, automated enforcement that fires every single time, no exceptions.

“In theory, there is no difference between theory and practice. In practice, there is.”

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This is the seventh article in the CCDD (Claude Code Deep Dive) series. The previous articles are:

1. Claude Code Deep Dive — Basics
2. Claude Code Deep Dive — Slash Commands
3. Claude Code Deep Dive — Total Recall
4. Claude Code Deep Dive — Mad Skillz
5. Claude Code Deep Dive — MCP Unleashed
6. Claude Code Deep Dive — Subagents in Action

🪝 True story, Bro 🪝

I have a test-runner agent configured in a project and VERY clear instructions in CLAUDE.md: always run the full test suite using the test-runner agent after making changes. Usually Claude Code read these instructions and follows them correctly. When it finishes a…