When you first create an Amazon Bedrock agent, you have a working draft version (DRAFT)
and a test alias (TSTALIASID) that points to the working draft version. When
you make changes to your agent, the changes apply to the working draft. You iterate on your
working draft until you're satisfied with the behavior of your agent. Then, you can set up
your agent for deployment and integration into your application by creating aliases of your agent.
Aliases and Versions
To deploy your agent, you must create an alias. During alias creation, Amazon Bedrock creates a version of your agent automatically. The alias points to this newly created version. Alternatively, you can point the alias to a previously created version of your agent. Then, you configure your application to make API calls to that alias.
A version is a snapshot that preserves the resource as it exists at the time it was created. You can continue to modify the working draft and create new aliases (and consequently, versions) of your agent as necessary. In Amazon Bedrock, you create a new version of your agent by creating an alias that points to the new version by default. Amazon Bedrock creates versions in numerical order, starting from 1.
Versions are immutable because they act as a snapshot of your agent at the time you created it. To make updates to an agent in production, you must create a new version and set up your application to make calls to the alias that points to that version.
With aliases, you can switch efficiently between different versions of your agent without requiring the application to keep track of the version. For example, you can change an alias to point to a previous version of your agent if there are changes that you need to revert quickly.
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