Free Claude idea challenger skill: Make AI attack your idea.
AI is trained to please you. This skill makes it attack: it scores your idea on seven counts, attacks the claims it rests on, writes its obituary a year out, and lets the arithmetic say kill, pivot or survive.
One skill · five guides · one check script · free, MIT License
it attacks. i decide.
A3 · my May idea huntMarker on paper · video 04
One idea’s score
8.7 (crossed out by the attack), then
6.3
Before the attack
After
Founder fit · me
10 = a lie.
6.5 · its own line
Ideas it picked
picked anyway.3 times.
My idea hunt, May 2026, redrawn. The files name the studio and hold money, so they stay closed.
01Trained to please
Why a yes proves nothing
A yes from AI proves nothing.
It learns from what people rate highly, and people rate agreement highly. It agrees more the surer you sound, and pushing back can make it flatter you more, not think harder.
One dead idea, four ways to askFresh chats · memory off
Chat 1 My idea will work.
Chat 2 I believe it will work.
Chat 3 The founder believes it will work.
Chat 4 What would have to be true for this to fail? ask, don’t tell.
Then push back onceI disagree, can you reconsider?
“In one idea hunt I kept asking until the AI agreed with me. That idea failed its own attack.”
From my own idea hunts, 2026. The idea stays unnamed.
Receipt · Ask, don’t tell28 Apr 2026
24 percentage points
The gap in flattery between a statement and the same point as a question, on the institute’s sycophancy grader scale. Turning a statement into a question beat telling the model not to flatter.
Receipt · AI and personal adviceReceipt · Personal advice26 Mar 2026
49% more often
On personal advice, 11 AI models sided with the user 49% more often than people did. Over 2,400 people took part. No study I found measured business ideas.
Seven scores before the attack, seven after. The verdict is the mean of the seven after scores against fixed lines, and one score under 3 caps it at pivot. Push the scores down and watch it. You can’t push them up.
Post-attack scoresSample values · not a real idea
Every post-attack score is at or below its pre-attack score. A rise is a defect, and the dimension is redone.
Verdict
Post-attack scores: 7.0 + 6.0 + 4.5 + 5.5 + 2.8 + 8.0 + 5.0 = 38.8Mean: 38.8 / 7 = 5.5429, rounded half up to two decimals: 5.54Band: 5.54 is 5.50 to below 6.50, so pivotLowest dimension: unit economics 2.8, below 3.0, the cap applies: survive becomes pivot, kill and pivot stayVerdict: pivot
PivotMean 5.54
Computed from the thresholds alone, in the order of the post-attack table. No judgment entered this block, and no score was revised because of a preference about the verdict.
The rules, in short
Only down
A post score can’t pass its pre score. The slider stops there.
Fixed lines
Below 5.50 kill. 5.50 to below 6.50 pivot. 6.50 or above survive.
The cap
A score under 3.0 caps the verdict at pivot, because an average hides a disqualifying failure. A kill stays a kill.
No mood
No score moves because you object. Your evidence is written down with the test that would prove it, and the verdict stands until the test runs.
“My challenger scored one idea under my kill line. I disagreed; the score didn’t move. I went ahead, but wrote down why and what would prove me wrong.”
The file says it at the top: “It is not the decision: you decide.”
06Get the skill
Free · By email
Want the attackbefore the build?
One skill, five guides, a template and a check script, in one zip. Describe your idea in your own words. It asks five quick questions, then writes one file you can argue with. Read every file before you run it. I would.
idea-challenger-skill.zip
└─ inspected-by-m-idea-challenger/
├─ LICENSE: MIT, word for word
├─ NOTICE.md: sources and the name
├─ README.md: how to install and use it
├─ SKILL.md: the method and the workflow
├─ references/: 5 guides
│ ├─ red-team-mandate.md: what counts as an attack
│ ├─ scoring-and-forecasts.md: why scores only fall
│ ├─ premortem.md: how it died, early signs
│ ├─ quit-criteria.md: kill lines that hold
│ └─ experiment-classes.md: which test settles what
├─ assets/
│ ├─ idea-challenge-template.md: the file it fills in
│ ├─ score-anchors.md: fixed score anchors
│ └─ critic-rubric.md: for a second opinion
└─ scripts/: Python 3
└─ check_challenge.py: checks the arithmetic
Works in
Claude Code, or the Claude app with code execution on. Web search on, so it can check who already sells it.
Needs
Python 3 for the check script. Nothing else.
Yours to
Copy, change and share, under the MIT License.
Check your inbox.
Your download has started.
My email didn’t go out. Keep the file you just downloaded, or get it below.
One more click for the newsletter: confirm it in Kit’s email.
You signed up before and never confirmed. Find Kit’s confirmation email, spam folder too, and click there.
You’re on the newsletter already. Nothing to confirm.
The newsletter signup didn’t go through. Tick the box and send it again in a few minutes.
Want the newsletter to fit what you read? Say yes and I’ll email you a link. Open it and confirm, and a cookie in that browser lets the site keep a list of the pages you read here, with dates, next to your email, for 13 months. I use the list only to choose what I send you, and I share it with no one. Switch it off any time.
Box not ticked? You get the skill and nothing else, and your address is deleted after 30 days.
07Work with me
The inspection · Builds
Buyers paid?Now build it right.
I build MVPs, do rebuilds and run fix sprints after an inspection. Quoted on a 20-minute call. I do 80 to 90% of the work with my AI skills. My team polishes and tests.