Engineers, DELETE the BASH Tool: Agentic Security For Pi Agent and Claude Code

95% of engineers are ONE BAD PROMPT away from their agents NUKING production. The Bash tool is a ticking time bomb sitting inside every single agent harness you run, and the math is brutal: RISK COMPOUNDS WITH RUNTIME. ⭐️ VIDEO REFERENCES - Damage From Within Codebase: https://github.com/disler/bash-damage-from-within - Damage Control Video: https://youtu.be/VqDs46A8pqE - Mythos Level Model Video (Capability): https://youtu.be/RvowJ_hmLps - Threads of Work Blog: https://agenticengineer.com/thinking-in-threads - Pi Agent Harness Video: https://youtu.be/f8cfH5XX-XU - Pi Coding Agent: https://pi.dev/ - Master Agentic Coding: https://agenticengineer.com/tactical-agentic-coding?y=yBcmIoA-vGs This video lays out the FIVE LEVELS OF BASH SECURITY for agentic coding, the framework every AI engineer needs before scaling agents to the moon. We run the exact same destructive prompts side-by-side against Claude Code with Opus 4.7 and the Pi coding agent with GPT 5.5, and watch the levels expose themselves in real time. Here's the framework in plain terms: Level 1: User prompt / skill - lazy, jailbreakable, non-deterministic. You're praying to the model gods. Level 2: System prompt - the law for your agent... but laws get broken at long runtime. Level 3: Bash tool + blacklist - the default I run globally via damage control hooks. Good start, but you'll NEVER cover every CLI, every regex, every inline script your agent can write. Level 4: Bash tool + whitelist - now we're engineering. You allow ONLY what your agent needs. Level 5: NO BASH TOOL AT ALL - the senior engineering move. Replace bash with explicit tools (MCP servers for Claude Code, extensions for Pi). Here's the math nobody is doing. If your agent has just a 0.001% chance of doing something catastrophic per run, you get roughly 100,000 runs before disaster. Sound safe? You're scaling agent runtime to the MOON. Risk compounds with runtime. It's not IF, it's WHEN. Every level you climb drives that disaster threshold