Starting in Home Assistant 2026.8, Developer Tools will be renamed to Tools. This change will impact UIX Styling using the theme item uix-developer-tools(-yaml).

As the current Developer Tools panel (ha-panel-developer-tools) and new Tools panel (ha-panel-tools) are both config panels (ha-panel-config), which can be styled in theme with uix-config(-yaml), the following changes will take place in UIX Styling.

  1. The theme item uix-developer-tools(-yaml) will cease to apply in Home Assistant 2026.8 as ha-developer-tools-panel will cease to exist.
  2. There will be NO direct replacement theme item.
  3. The new Tools panel (ha-panel-tools) can be styled using uix-config(-yaml).

You can prepare for this change now by swapping out any existing uix-developer-tools(-yaml) theme item with a uix-config(-yaml) theme item, as shown in the example theme code below.

Existing theme example, changing card heading color on the YAML tab to red.

  uix-developer-tools-yaml: |
    developer-yaml-config $ ha-card $: |
      :host {
        --ha-card-header-color: red;
      }

New theme code which will work prior to and after 2026.8 is released.

  uix-config-yaml: |
    ha-panel-developer-tools,ha-panel-tools $:
      developer-yaml-config $ ha-card $: |
        :host {
          --ha-card-header-color: red;
        }

Home Assistant output

example