> For the complete documentation index, see [llms.txt](https://docs.takomo.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.takomo.io/stack-properties/obsolete.md).

# Obsolete

You can exclude stacks from configuration by marking them as obsolete with the `obsolete` property. Obsolete stacks can be removed with [prune stacks](/command-line-usage/prune-stacks.md) command. 

Obsolete stacks can't have dependents that are not obsolete themselves.

#### Examples

Setting the `obsolete` property:

```yaml
obsolete: true
```

## Where to define

The `obsolete` property can be defined in stack and stack group configuration files. If specified in a stack group, the stack group's children and stacks inherit the value but can also override it.

## Requirements

The `obsolete` property must satisfy these requirements:

* Must be a boolean