What does this skill do?

The Text Polygraph Analyzer examines an email, a letter, or a written statement and separates what can be verified from what cannot; it detects contradictions—both internal and in relation to what you already know—and provides you with a plan of questions and documents to help you uncover the truth. Now, let’s be clear: in a text, it’s very difficult to determine whether something is true or false, and the final decision is yours to make. This is not the same as a real polygraph, whose effectiveness studies place—depending on the person, the case, and who administers the test—in a range of approximately 80% to 98%. This skill doesn’t give you a verdict or a false “honesty” percentage—it provides you with the groundwork so you can make an informed decision. Skill developed by elpoligrafo.es.

🔎 Do you need to know the truth and live in Spain? El Polígrafo can help you with a professional test.

What is verifiable
Classify each statement as verifiable, unverifiable, or "verifiable only by the author," using the verifiability ratio as the count.
Contradictions
Identify anything in the text that contradicts what you already know, and always consider the most plausible innocent explanation.
What the text leaves out
It points out unanswered questions, details that fade away just when they matter most, and information that should be there but isn't.
Contrast Plan
A checklist of questions in the right order and which documents to request, using the Strategic Use of Evidence so as not to reveal what you already know.

How to install

$ Quick install (one-liner) 
git clone https://github.com/aulatina/analizador-poligrafo-texto.git ~/.claude/skills/analizador-poligrafo-texto

Download the ZIP, unzip it into ~/.claude/skills/ and restart Claude. That's all. Full installation guide →

Usage examples

📧 Suspicious email
Take a look at this email from my provider: separate the verifiable information from the unverifiable, and let me know what I should ask him.
📄 Written statement
I have a written statement from a tenant. Point out any contradictions regarding these dates that I'm already aware of, and provide me with an innocent explanation for each one.
🔍 Contradictions
Compare this message with what I already know (I'll give you the details) and point out exactly where it doesn't fit.
🗂️ Question Guide
Give me a list of questions, in order, so I can verify this story without revealing what I already know.

Features

Verifiability Approach Classify each statement based on whether it can be confirmed by a third party, a document, or a record. The verbal method with the strongest empirical support.
Detection of Contradictions Three levels: in comparison with facts you already know, in comparison with previous texts by the same author, and within the text itself.
What the text does not address It describes the gaps without attributing intentions: unanswered questions and specifics that go right to the heart of the matter.
Contrast Plan (SUE) 5 to 10 steps: what to ask, in what order, and when to present the evidence you already have on hand.
No fabricated verdicts It never gives you a false "X% sincerity" rating or claims that someone is lying. The final decision is yours—use your best judgment.

Frequently asked questions

No, and be wary of any tool that claims otherwise. In a text taken out of context, there is no validated method for detecting deception. This skill shows you what to look for, what doesn't add up, and what questions to ask; you decide the final outcome using your own judgment.
A polygraph measures physiological responses in a controlled test, and its effectiveness—depending on the studies, the individual, the case, and who administers it—ranges from approximately 80% to 98%. A written text does not provide such signals, so here we are not talking about percentages of honesty, but rather about verifiability and contradictions.
This skill was developed by elpoligrafo.es (https://elpoligrafo.es/), specialists in verification and credibility analysis.
No. This analysis is not a substitute for legal advice, document verification, or professional expertise. It is a tool to guide your own fact-checking efforts.
The text to be analyzed and, above all, the facts you already know for certain (dates, amounts, documents, previous messages). Without that context, it cannot detect contradictions, which is the most valuable aspect.
Text Polygraph Analyzer