**Dependent features** were first introduced in Unleash 5.7 for Pro and Enterprise users.
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## Overview
Dependent features allow to define a child feature flag that depends on a parent feature flag.
A feature flag can have only one parent dependency but multiple child flags can share the same parent. For a child flag to be activated, its parent dependency must be enabled.
## Parent dependency criteria
* **Project Association**: Both parent and child flags should belong to the same project.
* **Single Level Dependency**: The parent flag can’t have its own parent, ensuring a straightforward, single-level dependency.
## Managing dependencies
### Adding
Introduce dependencies either through the UI or API, also applicable when copying a child feature with an existing parent dependency.
### Removing
Eliminate them through the UI or API. Dependencies are also removed when archiving a child feature. A parent feature can’t be removed if it would leave a child feature orphaned. To remove both, batch archive them. If Unleash confirms no other child features are using the parent, archiving proceeds.
## Permissions
The **Update feature dependency** project permission, auto-assigned to admin and project members, allows managing dependencies.
## Metrics calculation
Metrics are influenced solely by the evaluation of child features.
## Client SDK Support {#client-sdk-support}
To make use of dependent feature, you need to use a compatible client. Client SDK with variant support:
- Client SDKs talking to [unleash-proxy](https://github.com/Unleash/unleash-proxy) (from v0.18.0)
- Client SDKs talking to [unleash-edge](https://github.com/Unleash/unleash-edge) (from v13.1.0)
- Client SDKs talking to Frontend API in [unleash-server](https://github.com/Unleash/unleash) (from v5.7.0)
- Unleash Playground in [unleash-server](https://github.com/Unleash/unleash) (from v5.7.0)
If you would like to give feedback on this feature, experience issues or have questions, please feel free to open an issue on [GitHub](https://github.com/Unleash/unleash/).
