> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/8.x/8.2-eol/cortex-xdr-agent-8.2-release-information/changes-to-default-behavior-in-cortex-xdr-agent-8.2.md).

# Changes to Default Behavior in Cortex XDR Agent 8.2

This section details behavior changes that you may encounter when using a new version of the Cortex XDR agent. Refer to the admin guide for further details.

#### Changes to Default Behavior in Cortex XDR Agent 8.2.2

#### Linux packages validation key

New Public key for validating Linux installation packages. For the download link, see the Install the Cortex XDR Agent for Linux section of the Cortex XDR agent admin guide.

#### Changes to Default Behavior in Cortex XDR Agent 8.2

For Container-Optimized OS (COS) on Google Cloud Platform, Cortex XDR agent now enforces User Space Mode. For details about configuration requirements and limitations, see [Cortex XDR Agent Administrator Guide](https://docs-cortex.paloaltonetworks.com/r/Cortex-XDR/8.2/Cortex-XDR-Agent-Administrator-Guide/Introduction).


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# Agent Instructions
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