/tools has stopped working under 9.0.2

Is it no longer possible to store own scripts under /tools with v9.0.2?

We had a script for an AJAX request here that no longer works.

/tools have been deprecated since v5.7, finally removed at v9.

In general, scripts are now registered/required as assets.
https://documentation.concretecms.org/developers/assets/registering-asset

Ajax URLs are declared as routes.

If it is just within a block or single page controller, you can also ajax directly to a controller action.

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I just yesterday accomplished man handling the new register/require asset system. Of the few different docs on this, this one in particular was the most helpful for me… Registering and Requiring CSS & JavaScript - Concrete CMS