> For the complete documentation index, see [llms.txt](https://help.nightfall.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.nightfall.ai/~/changes/OeQHuIkWUMEvfotVM6p8/nightfall-for-slack/slack-remediation-guide/redact.md).

# Redact

Redaction is a remediation action for messages within Slack.

When Nightfall detects a violation, and you have configured it to redact the violation, 

* The original message in the respective DM or channel is edited with an attachment of the redacted message. 
* All characters in the message, except the first two, are masked with special characters.

You can redact all messages in DMs, as well as for Private and Public channels. Redaction as a remediation action displays all violations in Slack. 

As an example, a message like this:

> This is a credit card 1111-11111-1111” will be redacted and displayed as an attachment in the original message with “Your message has been redacted as it potentially contained sensitive information. 
>
> This is a credit card 11\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*.

Nightfall cannot redact deleted or quarantined messages. User activities are generated every time a message is redacted similar to all other remediation actions.

Note: Files and images scanned in Slack are not supported for redaction.


---

# Agent Instructions
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## 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, and the optional `goal` query parameter:

```
GET https://help.nightfall.ai/~/changes/OeQHuIkWUMEvfotVM6p8/nightfall-for-slack/slack-remediation-guide/redact.md?ask=<question>&goal=<endgoal>
```

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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.