Agent Bash Safety — Why Your Agent Is a Security Risk

Most agents fail on bash not with an error — but with a quietly executed command that does something you did not intend. This free primer maps the threat model before anything breaks.

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⚡ What's Inside

• The injection surface How an agent assembles shell strings and why variable interpolation is an attack vector, not just a feature

• The top failure patterns rm -rf with wrong expansion, curl piped to bash, sudo without path validation, chained operators that bypass intent, and the Zsh-specific traps that bash docs miss

• The 19-validator concept Why pre-execution validation is the only reliable fix, and what each category of check is actually closing

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🏭 Built From Production

This was not written from a security textbook. It was written after watching agents cause real damage — files deleted, API calls fired at wrong targets, sudo escalations that were never meant to happen. Every pattern here has a real origin.

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💡 What This Is Not

A sales document. It is a genuine introduction to a genuine problem. If you read it and decide you do not need the full validator chain, fair — you will at least know exactly what risk you are accepting.

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✅ Core Capabilities

• ✅ Complete bash injection threat model for Claude Code deployments
• ✅ Five real failure patterns with root-cause explanations
• ✅ The 19-validator chain concept: what each category catches and why
• ✅ Decision framework — when is the full validator truly necessary
• ✅ Entry point to the Bash Security Validator SKILL.md ($19)