Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add guia-matthieu/clawfu-skills --skill inversiongit clone --depth 1 https://github.com/guia-matthieu/clawfu-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/guia-matthieu/clawfu-skills/inversion)<a href="https://agentmods.dev/skills/guia-matthieu/clawfu-skills/inversion"><img src="https://agentmods.dev/badge/skills/guia-matthieu/clawfu-skills/inversion/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/guia-matthieu/clawfu-skills/inversion"><img src="https://agentmods.dev/badge/skills/guia-matthieu/clawfu-skills/inversion.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00096 | $0.03668 |
| Opus 5 | $0.00048 | $0.01834 |
| Sonnet 5 | $0.00019 | $0.00734 |
| Haiku 4.5 | $0.00010 | $0.00367 |
Grade A, and why
inversion scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- inversion — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 530 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Inversion
"Invert, always invert." Apply Carl Jacobi's mathematical principle and Charlie Munger's investing wisdom to solve problems by thinking backward from failure.
When to Use This Skill
- Goal setting - Define what would guarantee failure, then avoid it
- Risk analysis - Identify what could destroy your project before starting
- Decision making - Evaluate choices by examining their worst outcomes
- Problem solving - When direct approaches aren't working, reverse the question
- Strategy development - Find competitive advantages by avoiding common mistakes
- Personal development - Identify habits and behaviors that guarantee failure
Methodology Foundation
| Aspect | Details |
|---|---|
| Source | Carl Gustav Jacob Jacobi (1804-1851), mathematician; Charlie Munger, investor |
| Expert | Munger credits Jacobi: "Invert, always invert" (from "man muss immer umkehren") |
| Core Principle | Many problems are best solved backward. Instead of asking "How do I succeed?", ask "What would guarantee failure?" then avoid those things. |
What Claude Does vs What You Decide
| Claude Does | You Decide |
|---|---|
| Structures content frameworks | Final messaging |
| Suggests persuasion techniques | Brand voice |
| Creates draft variations | Version selection |
| Identifies optimization opportunities | Publication timing |
| Analyzes competitor approaches | Strategic direction |
What This Skill Does
- Reveals hidden risks - Surfaces dangers invisible when thinking forward
- Simplifies complex problems - Failure paths are often clearer than success paths
- Prevents catastrophic mistakes - Avoidance is easier than achievement
- Improves decision quality - Forces consideration of downside scenarios
- Unlocks creative solutions - Reverse framing reveals new approaches
How to Use
Invert a Goal
Apply Inversion to this goal:
[describe your goal]
What would GUARANTEE failure? What should I avoid at all costs?
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 530 lines · 96 tokens per session scan A 8e459f3e8a0c
inversion is a skill published in the GitHub repository guia-matthieu/clawfu-skills (149 stars, last pushed 5mo ago), licensed MIT. It adds 96 tokens to every session and 3,668 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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