# Inversion Thinking > Proactive failure analysis using the Saboteur Method. Use when designing critical systems, security features, or debugging root causes. Use when this capability is needed. - Skill: `tomevault-io/inversion-thinking` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/inversion-thinking` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/inversion-thinking/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Security - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/inversion-thinking --- # Inversion Thinking (The Saboteur Method) > "Tell me where I'm going to die so I will never go there." - Charlie Munger ## When to Use * **Before** writing complex code (Architecture, Security, Critical features). * **During** debugging (to find root causes). * **When** a plan seems "too simple" or "optimistic". ## The Protocol: Become the Saboteur Do not ask "Does this work?". Ask "How do I break this?". Follow these 4 steps explicitly. ### 1. Define the Anti-Goal Explicitly write down the worst-case outcome. * *Goal:* "Keep user data safe." * *Anti-Goal:* "Leak all user data to the public internet." ### 2. The Saboteur Simulation Adopt the persona of a malicious actor or the embodiment of Entropy (Murphy's Law). Ask: **"I want to achieve the Anti-Goal. What is the easiest way to do it?"** ### 3. Proof of Fragility List concrete, specific pathways to failure. Use `references/failure_modes.md` for inspiration. * "I will send a 10GB file to crash the memory." * "I will send a request with `admin=true`." * "I will unplug the database cable mid-transaction." ### 4. Inversion (The Fix) Design specific safeguards to block those pathways. * "Enforce 10MB limit (HTTP 413)." * "Validate permissions on server side." * "Use atomic transactions with rollback." --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/calvyntwh) — claim your Tome and manage your conversions.