> For the complete documentation index, see [llms.txt](https://docs.hypertune.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hypertune.com/guides/use-string-interpolation.md).

# Use string interpolation

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You can format strings in Hypertune with arguments defined in your schema.

To create a formatted string, define an argument on the string field itself or one of its parent fields, e.g. in the `Context`. Then implement the string's logic with a Text Chain expression. Open the menu on the Text Chain to add an empty expression that you can set to an argument.