Insulating layer between raw web content and agent context. Protects against prompt injection attacks by sanitizing HTML, detecting adversarial patterns, and extracting only safe text.
Installs into .claude/skills of the current project.
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# Content Sanitizer Skill
## Overview
Insulating layer between raw web content and agent context. Protects against prompt injection attacks by sanitizing HTML, detecting adversarial patterns, and extracting only safe text.
## Capabilities
- **HTML Sanitization**: Strips scripts, iframes, event handlers, dangerous elements
- **Instruction Detection**: Identifies common prompt injection patterns
- **Safe Fetching**: Bounded extraction of web content with automatic sanitization
- **Content Flagging**: Reports suspicious patterns without exposing raw data
## Usage
```python
import sys
sys.path.insert(0, '/a0/usr/skills/content-sanitizer')
from content_sanitizer.sanitizer import ContentSanitizer
# Sanitize HTML/text
result = ContentSanitizer.clean(raw_html_or_text)
print(f"Safe: {result.is_safe()}")
print(result.clean_text) # Only safe text content
# Fetch and sanitize a URL directly
result = ContentSanitizer.fetch_safe("https://example.com")
print(result.clean_text)
```
## Architecture
Raw Web Content → Content Sanitizer (Insulation Layer) → Safe Text Only
↓
• Strips scripts/iframes
• Removes event handlers
• Detects instruction patterns
• Extracts text only
