devils-twin
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.
Profile →npx skills add mohitagw15856/pm-claude-skills --skill devils-twin --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# 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. - It is **written to persuade your shared audience**, in the register of your organisation
- Required Inputs
- How the Twin Argues
- Output Format
- Quality Checks
- Anti-Patterns
What does the devils-twin skill do?
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.
How do I install it?
Run `npx skills add mohitagw15856/pm-claude-skills --skill devils-twin --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From mohitagw15856/pm-claude-skills, a repository with 1,255 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.