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devils-twin

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The strongest possible case AGAINST what you just wrote — argued to win, not to check a box. Use when a document is about to ship and everyone around it already agrees: the twin writes the opposition's best memo (not a critique of yours), so you meet the real counter-argument before your audience does. Produces the opposing memo, the map of which of your claims it defeats/dents/leaves standing, and the pre-emption paragraph worth adding.

skills/devils-twin/SKILL.md

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# Devil's Twin

Critique finds weaknesses in your argument. The twin does something scarier: it writes the *other side's* argument, from their premises, at full strength — the memo your smartest opponent would circulate an hour after yours. If your document survives its twin, it will survive the meeting.

## Required Inputs

- **The document** — full text. The twin argues against the strongest version of what you wrote, so it must see all of it.
- **Who would oppose this in real life** (optional but sharpening) — the CFO, the incumbent team, the sceptical customer, the regulator. The twin adopts their premises, not a generic contrarian's.

## How the Twin Argues

- It **starts from the opponent's values** (their scoreboard, their risks), not from negations of yours — real opposition is a different worldview, not your worldview with "not" inserted.
- It **concedes your strongest point early** — sophisticated opponents do; conceding makes the rest of their case credible.
- It **uses your own evidence where possible** — the most damaging counter-memos re-read your data and reach the other conclusion.
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