The playground command will start an Agent on localhost, store all the data for the Agent in memory, and sign up for a temporary account for you to play around with.
Create a Topic
Let's create a topic using the Apache Kafka client built-in to the WarpStream Agent. We're going to assume in this tutorial you're running the Agent as specified above on localhost, so we'll omit the arguments to specify the Kafka bootstrap URL.
Now you should see your records you wrote previously printed to the console. The key is always "hello" and the value field is the same "world" string we wrote before. You can repeat the process of writing another record and running kcmd --type fetch again to read and write more records.