| name | Keyword Extractor |
| slug | keyword-extractor |
| description | Extract top keywords and keyphrases from text using TF-IDF scoring. Use when agents need to tag content, optimize SEO, build search indexes, or summarize topics. Returns ranked single words and multi-word phrases with frequency counts.
|
| category | NLP |
| tags | ["keywords","nlp","seo","tf-idf","content-tagging","text-analysis"] |
| price_per_call | 0 |
| input_schema | {"type":"object","properties":{"text":{"type":"string","description":"Text to extract keywords from (20-100,000 chars)"},"max_keywords":{"type":"number","description":"Max keywords to return (default 20, max 50)"}},"required":["text"]} |
| output_schema | {"type":"object","properties":{"keywords":{"type":"array","description":"Ranked keywords with term, score, count, type"},"top_words":{"type":"array","description":"Top 10 single-word keywords"},"top_phrases":{"type":"array","description":"Top 5 multi-word keyphrases"}}} |
| metadata | {"requires":{"env":["CLAW0X_API_KEY"]}} |
Keyword Extractor
Extract the most important keywords and keyphrases from any text. Uses TF-IDF scoring with stop word removal and bigram detection. No external API needed.
How It Works
- Tokenize text, filter stop words and short tokens
- Calculate term frequency (TF) for each word
- Detect significant bigrams (2-word phrases appearing 2+ times)
- Score phrases with 1.5x bonus over single words
- Return ranked list with scores and counts
Use Cases
- SEO optimization (find target keywords)
- Content tagging (auto-label articles)
- Search index building (extract index terms)
- Topic summarization (what is this text about?)
- Competitive analysis (keyword gap detection)
Prerequisites
- Sign up at claw0x.com
- Create API key in Dashboard
- Set environment variable:
export CLAW0X_API_KEY="ck_live_..."
Pricing
FREE. No charge per call.
- Requires Claw0x API key for authentication
- No usage charges (price_per_call = 0)
- Unlimited calls
Example
Input:
{
"text": "Machine learning models require large datasets for training. Deep learning neural networks have revolutionized machine learning by enabling automatic feature extraction from raw data.",
"max_keywords": 10
}
Output:
{
"keywords": [
{"term": "machine learning", "score": 8.5, "count": 2, "type": "phrase"},
{"term": "learning", "score": 5.2, "count": 3, "type": "word"},
{"term": "deep", "score": 3.1, "count": 1, "type": "word"}
],
"top_words": ["learning", "deep", "training", "data", "neural"],
"top_phrases": ["machine learning", "deep learning", "neural networks"]
}
Error Codes
| Code | Meaning |
|---|
| 400 | Text too short (<20 chars) or too long (>100K) |
| 401 | Missing or invalid API key |
| 500 | Extraction failed (not billed) |
About Claw0x
Claw0x is the native skills layer for AI agents.
GitHub: github.com/kennyzir/keyword-extractor
