> ## Documentation Index
> Fetch the complete documentation index at: https://www.cometchat.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Properties and Constraints

> Properties and Constraints for CometChat REST API.

Properties and constraints for the AI Moderation APIs.

## Rules

| **Property**          | **Constraints**            |
| --------------------- | -------------------------- |
| Maximum rules per app | Contact support for limits |
| Rule name             | Max 100 characters         |

## Keywords

| **Property**              | **Constraints**            |
| ------------------------- | -------------------------- |
| Keyword value             | Max 100 characters         |
| Maximum keywords per rule | Contact support for limits |

## Blocked Messages

| **Property**      | **Constraints**                                          |
| ----------------- | -------------------------------------------------------- |
| Message retention | Blocked messages are retained until reviewed or approved |