> For the complete documentation index, see [llms.txt](https://docs.jentis.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.jentis.com/jentis-dcp-elements/tools/advanced-settings/optional-constants.md).

# Optional Constants

Some tools come with optional global settings: "Optional Constants". Just as with the main "Constants" on the tool, you can configure different values here that you can then access in the tool's tags. Further, you can configure your own tool constant values to refer to in the tags. Again, those values can be a default setting or set to individual values on the container and environment levels.


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