> ## 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 Agent Builder APIs.

## Agents

| **Property**           | **Constraints**                                   |
| ---------------------- | ------------------------------------------------- |
| Agent UID              | System-generated UUID v4 (alpha-dash compatible). |
| Agent name             | Max 100 characters                                |
| Agent instructions     | Max 32,000 characters                             |
| Maximum agents per app | Contact support for limits                        |

## Tools

| **Property**            | **Constraints**            |
| ----------------------- | -------------------------- |
| Tool name               | Max 100 characters         |
| Maximum tools per agent | Contact support for limits |

## Knowledge Base

| **Property**                     | **Constraints**            |
| -------------------------------- | -------------------------- |
| Maximum file upload size         | 50 MB per file             |
| Supported file types             | PDF, TXT, DOCX, CSV, MD    |
| Maximum files per knowledge base | Contact support for limits |
| Maximum website pages per scrape | Contact support for limits |