# Link Security

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#### Link Security <a href="#link-security" id="link-security"></a>

Heimdall automatically checks links posted in chat for safety:

* **Safe domain whitelist:** Configurable list of trusted domains (cached with regular updates)
* **Redirect chain following:** Follows shortened URLs (bit.ly, t.co, tinyurl.com, etc.) to check the final destination
* **Pattern matching:** Regex patterns detect phishing, malware, and scam content on linked pages
* **404 detection:** Links returning 404 errors are flagged as dangerous
* **Re-checking:** Previously checked URLs are re-validated every 7 days


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.