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Claude Code hooks fail to block commands on exit code 1

By PulseAugur Editorial · [1 sources] ·

A user discovered a critical flaw in Claude Code's hook system where exit code 1, commonly understood as an error in Unix-like systems, does not actually block tool execution. Instead, only exit code 2 is recognized as a blocking error, causing Claude Code to proceed with the command after displaying a warning. This led to unintended data loss for the user, as their security hook, designed to prevent dangerous commands like `git reset --hard`, was bypassed for three weeks without them realizing it. AI

IMPACT Highlights a critical nuance in AI tool execution logic that could lead to unintended consequences for users.

RANK_REASON User discovers and reports a functional bug in a specific feature of an AI product.

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Claude Code hooks fail to block commands on exit code 1

How we ranked this

Signal score
20 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
User discovers and reports a functional bug in a specific feature of an AI product.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, other
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AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
Fresh story with cross-source coverage still developing. Ranking may shift as more sources report.

Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 English(EN) · jidonglab ·

    Claude Code Hooks: Exit Code 1 Doesn't Block. 9 of 9 Commands Ran

    <p>My guard hook printed <code>BLOCKED: git reset --hard</code> in red text. Then Claude Code ran <code>git reset --hard</code> anyway, and an afternoon of uncommitted work went with it.</p> <p>The hook wasn't broken in the way I expected. It matched the pattern perfectly. It wro…

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