<!--
name: 'System Block: Version metadata'
description: Internal Claude Code/SDK version and entrypoint metadata.
sdkPackage: '@anthropic-ai/claude-agent-sdk@0.3.168'
claudeCodeVersion: '2.1.168'
-->
# System Block: Version metadata

## Metadata

- Request location: `system[0]`
- Type: `text`
- Cache control: `none`

## Content

```text
x-anthropic-billing-header: cc_version=2.1.168.c27; cc_entrypoint=sdk-ts; cch=e5666;
```