DT
Devil's Twin
🔵 Stable🕐 updated 2026-07-08
🔷 SkillSpec L3
pm-warroom
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.
What to give it
▸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) — (optional but sharpening) — the CFO, the incumbent team, the sceptical customer, the regulator. The twin adopts their premises, not a generic contrarian's.
✅ The bar it holds itself to
Every skill in this library self-verifies — these are this skill's own quality checks, straight from its definition.
✓The memo argues FROM the opponent's premises — deleting "not" from your claims would not reconstruct it
✓It concedes at least one of your points — full-spectrum opposition is a strawman wearing a suit
✓At least one of your claims is marked 💀 or the twin explains why your case is unusually airtight (rare; suspicious)
✓The pre-emption paragraph is drop-in ready — your voice, your document's structure, no "as some may argue" throat-clearing
✓If the twin's case is stronger overall, the verdict says so plainly
⚠️ What it refuses to do
Do not write a critique with quotations — the deliverable is the opposition's own memo, structure and all
Do not make the twin stupid to make you feel good — a weak twin is worse than none; it inoculates you against the wrong argument
Do not have the twin invent facts — it may reinterpret your evidence and add commonly-known context, never fabricate data
Do not skip the verdict to stay diplomatic — "repair first" beats a polite shrug
Do not use the twin on documents whose audience is hostile already — it's for consensus rooms, where nobody else will say this
Install
npx pm-claude-skills add --agent claude # or codex · cursor · gemini · hermes
# or one-line MCP (every skill, any client):
claude mcp add pm-skills -- npx -y pm-claude-skills-mcpRelated skills
🔌 Embed this skill
Drop this on your blog, docs, or site — it renders a "Run this skill" card:
<div data-pm-skill="devils-twin"></div>
<script src="https://mohitagw15856.github.io/pm-claude-skills/embed.js" async></script>💬 Discussion
Devil's Twin is one of 599 open-source professional AI agent skills — all SkillSpec L3.
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