# Variables
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Variables use the `!{name}` syntax. The supported variables are:


| Variable | Description | 
| --- | --- | 
| `!{channel-id}` | The Channel ID. | 
| `!{topic-name}` | The source Kafka topic name. | 
| `!{partition-id}` | The source Kafka partition ID. | 
| `!{kafka-offset}` | The Kafka offset of the first record in the object. | 
| `!{sequence-number}` | A monotonic per-object (batch) sequence number. | 
| `!{yyyy}` | Year (4-digit). | 
| `!{YY}` | Year (2-digit). | 
| `!{MM}` | Month. | 
| `!{dd}` | Day. | 
| `!{HH}` | Hour (24-hour). | 
| `!{mm}` | Minute. | 

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for Amazon Managed Streaming for Apache Kafka. To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query msk` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).