**AWS Mainframe Modernization self-managed experience** is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization self-managed experience, explore capabilities from vendor-direct offerings and from AWS Transform. Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html). 

**AWS Mainframe Modernization Service (Managed Runtime Environment experience)** is no longer open to new customers. For capabilities similar to AWS Mainframe Modernization Service (Managed Runtime Environment experience) explore AWS Mainframe Modernization Service (Self-Managed Experience). Existing customers can continue to use the service as normal. For more information, see [AWS Mainframe Modernization availability change](https://docs.aws.amazon.com/m2/latest/userguide/mainframe-modernization-availability-change.html). 

# Modify the source code with AWS Transform for mainframe Developer IDE
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If you are using the AWS-managed AWS Transform for mainframe runtime engine, you can use AWS Transform for mainframe Developer to modify the generated source code. You might want to do this if you need to update the modernized code for some reason, or if a portion of the legacy source code couldn't be modernized. You access AWS Transform for mainframe Developer through Amazon WorkSpaces Applications. This section describes how to set up AWS Transform for mainframe Developer on WorkSpaces Applications. It also explains how to use AWS Transform for mainframe Developer to update source code, using the sample application PlanetsDemo.

**Topics**
+ [Tutorial: Set up WorkSpaces Applications for AWS Transform for mainframe Developer IDE](set-up-appstream-ba.md)
+ [Tutorial: Use AWS Transform for mainframe Developer on WorkSpaces Applications](tutorial-ba-developer.md)

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for AWS Mainframe Modernization. To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query m2` — 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).