docs(mcp): add section about prompt injection in docs and skill

agent-skill/Scrapling-Skill/references/mcp-server.md

@@ -152,6 +152,18 @@ Start with `get` (fastest, lowest resource cost). Escalate to `fetch` if content
 - `extraction_type="markdown"` (default) is best for readability. Use `"text"` for minimal output, `"html"` when structure matters.
 - If a `css_selector` matches multiple elements, all are returned in the `content` list.
 
+## Prompt injection protection
+
+When `main_content_only=true` (the default), the server automatically sanitizes scraped content to prevent prompt injection from malicious websites. It strips:
+
+- CSS-hidden elements (`display:none`, `visibility:hidden`, `opacity:0`, `font-size:0`, `height:0`, `width:0`)
+- `aria-hidden="true"` elements
+- `<template>` tags
+- HTML comments
+- Zero-width unicode characters
+
+Keep `main_content_only=true` for maximum protection.
+
 ## Setup
 
 Start the server (stdio transport, used by most MCP clients):

docs/ai/mcp-server.md

@@ -33,6 +33,7 @@ The Scrapling MCP Server provides nine powerful tools for web scraping:
 - **Browser Impersonation**: Mimic real browsers with TLS fingerprinting, real browser headers matching that version, and more
 - **Parallel Processing**: Scrape multiple URLs concurrently for efficiency
 - **Session Persistence**: Reuse browser sessions across multiple requests for better performance
+- **Prompt Injection Protection**: Automatic sanitization of hidden content (CSS-hidden elements, aria-hidden, zero-width characters, HTML comments, template tags) that could be used for prompt injection attacks
 
 #### But why use Scrapling MCP Server instead of other available tools?
 
@@ -312,7 +313,18 @@ Here is some technical advice for you.
 - Use `main_content_only=true` to avoid navigation/ads
 - Choose an appropriate `extraction_type` for your use case
 
-### 5. Use Sessions for Multiple Requests
+### 5. Prompt Injection Protection
+The MCP server automatically sanitizes scraped content when `main_content_only` is enabled (the default). This strips hidden content that malicious websites could use to inject instructions into the AI's context:
+
+- **CSS-hidden elements**: `display:none`, `visibility:hidden`, `opacity:0`, `font-size:0`, `height:0`, `width:0`
+- **Accessibility-hidden elements**: `aria-hidden="true"`
+- **Template tags**: `<template>` elements
+- **HTML comments**: `<!-- ... -->`
+- **Zero-width characters**: Invisible unicode characters like zero-width spaces
+
+This protection runs automatically on all MCP tool responses. Keep `main_content_only=true` (the default) for maximum protection.
+
+### 6. Use Sessions for Multiple Requests
 - Use `open_session` to create a persistent browser session when scraping multiple pages
 - Pass the `session_id` to `fetch` or `stealthy_fetch` calls to reuse the same browser
 - Always close sessions with `close_session` when done to free resources