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Claude Code Safety Mastery
A 50-point safety audit and the defensive hooks behind it — Claude Code hooks for git guards and credential leaks, Claude Code security for subagent limits, and eight dated incidents where the guard itself failed silently.
This book is 100% completeLast updated on 2026-08-28
Once the five essential hooks are in place, the incidents that keep happening are the guards themselves failing, silently. Eight chapters collect the hooks (Git, credentials, token spikes, autonomous operation, multi-agent work), a chapter on hooks that do not fire, eight dated incidents from the author's own unattended operation, and a 50-point audit you can run against your own setup.
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This book is part of the Claude Code Operator's Library (4 books). Through September 17, 2026, that bundle is in Leanpub's monthly sale at $14.50 for all four, against $51.96 if bought separately. Coupon link: https://leanpub.com/b/cc-operators-library/c/LeanpubMonthlySale202609010
Claude Code is powerful, and that is exactly the risk. But once the five essential hooks are in place, the incidents that keep happening are no longer Claude deleting your files. They are the guards themselves failing, usually with no error at all: a stashing hook that swallowed 3,071 entries of uncommitted work, a cost circuit breaker wired to the wrong event that read zero for months, seventeen of nineteen hooks blocking nothing on a machine without jq, and a subagent limiter that stopped the parent and never the child.
Eight chapters take you from the five essential hooks every user should install first, through Git protection, credential guards, token-spike alerts, autonomous-operation safeguards, multi-agent safety, and troubleshooting hooks that do not fire, closing with eight dated incidents and a 50-point safety audit checklist. Every hook is tested and explained.
The incidents come from one autonomous Claude Code operation running since 2026-02-15: a single operator, personal repositories, no team and no production service. For Claude Code users who want to run it safely, especially autonomously, and for teams who need consistent safety policies across contributors.
Written by an independent operator who runs Claude Code autonomously and maintains cc-safe-setup, a free MIT-licensed collection of 914 example safety hooks: https://github.com/yurukusa/cc-safe-setup
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About the Author
yurukusa
Everything I publish starts from something that actually broke.
I run Claude Code on real projects, often unattended, and I have lost work to it. Most of what the books catalogue did not happen to me, though. It happened to other people, in public: every incident is tied to a numbered issue you can open and read, including the ones that were closed without a fix. The hooks in cc-safe-setup (MIT, open source) exist because I wanted a floor under an agent nobody was watching, and I would rather show you a stranger's incident with a link than a story of my own without one.
Two things I hold myself to. If a number in one of my books is not something I measured, it says so. And if a command is printed, the output beside it came back from an actual run — failures included, because a check that cannot fail is not a check.
I am not selling certainty. Most of what I know here, I learned by breaking my own setup.
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