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deepseek-harness/packages/client/ui-theme/README.md
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# @deepseek-ai/dsh-client-ui-theme
English | [中文](README.zh.md)
Theme plugin: ThemeService over the --dsw-* token base stylesheets (static scale + alias semantic layers). The service owns the theme preference (`light`/`dark`/`system`, persisted under `dsh.theme`), resolves `system` through `prefers-color-scheme`, and publishes immutable `ThemeSnapshot`s on the `theme/change` event; it never touches the DOM — ui-layout's presenter applies the resolved snapshot (`html { color-scheme }`, `body[data-ds-dark-theme]`, and inline alias tokens). Contract: api-contracts v3 §8.
## Model Experience
None, as the theme service manages a browser preference; nothing here reaches a model request.
#### KV Cache effect
None; this package neither assembles nor sends a provider request.
## Known Limitations and Deferred Work
- **Third-party themes are a surface, not a product** — registering one means overriding same-named alias variables; no validation exists that an override set is complete.
- **The token sheets are the sole color authority** — values absent from cssdesign (for example the design's #4176E6 tab blue) are deliberately not appended; the nearest semantic token wins (arbitrated 2026-07-22).