# 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 --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.takomo.io/stack-properties/obsolete.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.