seo-ai-content-check

name	seo-ai-content-check
description	Detect AI-generated content using pure text analysis (no external API calls). Analyzes sentence uniformity, vocabulary diversity, repetition patterns, hedging language, paragraph uniformity, and personal experience signals. Returns a 0-100 confidence score plus flagged passages. Use when user says "AI content check", "AI detection", "AI written", "content authenticity", "AI content", "detect AI".
allowed-tools	["Read","Bash","Glob","WebFetch"]

AI Content Check

Analyzes text for AI-generated content indicators using writing pattern analysis. No external API calls — pure local text analysis.

Inputs

• target: URL or file path.
  • If URL: fetch content with WebFetch, extract plain text from HTML body.
  • If file path: read directly with Read tool. Accepts .md, .txt, .html.
  • Strip HTML tags, navigation, headers/footers before analysis. Analyze body copy only.

Execution

Perform all 6 analysis checks, then compute the confidence score.

Check 1: Sentence Structure Uniformity (weight: 20%)

Split text into sentences on ., !, ? (ignore abbreviations like "e.g.", "vs.", "etc."). Calculate word count per sentence. Compute standard deviation of sentence lengths.

• SD < 3 words: FLAGGED (very uniform — AI pattern)
• SD 3-6 words: WARNING
• SD > 6 words: PASS (natural variance)

Score: 0 if SD > 6, 50 if SD 3-6, 100 if SD < 3 (higher = more AI-like)

Check 2: Vocabulary Diversity — Type-Token Ratio (weight: 20%)

Tokenize text into lowercase words (strip punctuation). For each 500-word sliding window: Calculate TTR = unique words / total words.

• TTR < 0.4: FLAGGED (low diversity — AI pattern)
• TTR 0.4-0.55: WARNING
• TTR > 0.55: PASS

If fewer than 500 words, analyze full text. Report worst window TTR. Score: 0 if TTR > 0.55, 50 if 0.4-0.55, 100 if < 0.4

Check 3: Repetition Patterns (weight: 20%)

Detect over-used AI phrases — flag any of these appearing in the text: "In conclusion", "It's worth noting", "It's important to note", "At the end of the day", "In today's digital landscape", "In today's fast-paced", "In today's modern", "Delve into", "Navigating the", "Leverage", "Cutting-edge", "Revolutionize", "Seamlessly", "Robust solution", "Comprehensive guide", "Game-changer", "Deep dive", "Unlock the potential", "Dive into"

Also detect 3+ word repeated phrases appearing 3+ times in text (using Bash grep -o). Score: 0 if 0 phrases flagged, 25 per flagged phrase (max 100)

Check 4: Hedging Language Rate (weight: 15%)

Count hedging words/phrases per 1000 words: "may", "might", "could", "perhaps", "arguably", "generally speaking", "it could be argued", "one might say", "in some cases", "typically"

• Rate > 8 per 1000 words: FLAGGED
• Rate 4-8: WARNING
• Rate < 4: PASS

Score: 0 if < 4, 50 if 4-8, 100 if > 8

Check 5: Paragraph Uniformity (weight: 10%)

Split text into paragraphs (on double newlines or <p> tags). Calculate word count per paragraph. Compute standard deviation of paragraph lengths. Exclude paragraphs < 5 words (bullets, headers).

• SD < 15 words: FLAGGED (very uniform)
• SD 15-30: WARNING
• SD > 30: PASS

Score: 0 if SD > 30, 50 if 15-30, 100 if < 15

Check 6: Personal Experience Signals (weight: 15%)

Detect first-person experience markers: "I tested", "I tried", "I found", "I noticed", "we found", "we tested", "in my experience", "our team", "I've been", "we've been", "personally", "my [N] years", "I recommend", "I use"

For opinion/review/guide content:

• 0 markers found: FLAGGED (AI typically avoids personal voice)
• 1-2 markers: NEUTRAL
• 3+ markers: PASS (authentic human voice)

Detect content type from headings — skip this check for factual/reference content. Score: 100 if 0 markers (opinion content), 50 if 1-2, 0 if 3+

Confidence Score Calculation

Weighted average: (Check1×20 + Check2×20 + Check3×20 + Check4×15 + Check5×10 + Check6×15) / 100

• 0-30: Likely human-written
• 30-60: Mixed or AI-edited
• 60-100: Likely AI-generated

Output Format

## AI Content Analysis: [filename/URL]

### Confidence Score: [N]/100 — [Likely Human / Mixed / Likely AI-Generated]

**Interpretation:** [0-30: Likely human | 30-60: Mixed/edited | 60-100: Likely AI]

### Detailed Findings

| Check | Score | Status | Detail |
|-------|-------|--------|--------|
| Sentence Uniformity | N/100 | PASS/WARN/FLAGGED | SD: N words |
| Vocabulary Diversity | N/100 | PASS/WARN/FLAGGED | TTR: N.NN |
| Repetition Patterns | N/100 | PASS/WARN/FLAGGED | N phrases detected |
| Hedging Language | N/100 | PASS/WARN/FLAGGED | N per 1000 words |
| Paragraph Uniformity | N/100 | PASS/WARN/FLAGGED | SD: N words |
| Experience Signals | N/100 | PASS/WARN/FLAGGED | N markers found |

### Flagged Passages

[Quote specific text passages that triggered flags, with explanation]

### Recommendations for Improving Authenticity

[If score > 30, specific suggestions to make content more human-like]

## Data Sources

- Source: [URL fetched via WebFetch / Local file] (no external AI detection API)