domitor-syh/dsh-ui-skin-switcher

A Claude Desktop-style switcher plugin for the DeepSeek Harness (DSH) Web GUI: a floating "seat" next to the input box for picking a model and dialing reasoning effort — dropdown for models, slider for effort.

Compatibility: supports DSH 0.1.5 and newer only.

What it is

dsh-ui-skin-switcher registers the conversation.input.model slot and renders a model + reasoning-effort switcher seat next to the composer input.

It rides the exact same channel the first-party selector uses: it reads the provider-grouped model directory and the current selection through ctx.modelDirectories — the same source the /model panel renders — and submits through that same selection call, so a switch made here is what /model shows next and takes effect on the current session.

The style pays homage to Claude Desktop's switcher — slider feel, rounded track, hover highlight.

Features

Feature	Detail
Model switching	Clicking the model entry expands the model list ordered by vendor; the selection applies immediately and the matching reasoning effort updates together
Effort slider	Supports both click and drag, with multiple effort nodes; supported levels differ per model, and adjustments apply immediately
Max-effort dot matrix	Reaching max effort reveals a right-to-left dot-matrix sweep on the track, with the handle glowing
Per-model memory	Remembers the last effort per model, kept across switches
Theme adaptive	All colors bound to DSH theme tokens; readable in light/dark themes and transparent skins

Video preview

The inline player needs a GitHub sign-in and cannot play while signed out; in that case click the link below to watch in a new tab.

▶︎ Watch the full demo video — model switching, the effort slider, and the top-level dot-matrix animation.

Compatibility

Supports DSH 0.1.5 and newer only.

DSH version	Works	Notes
0.1.5-alpha.1 … 0.1.5-rc.3	✅	The whole 0.1.5 line; spot-checked at alpha.1, rc.2 (full end-to-end run) and rc.3
0.1.6-alpha.1 / alpha.2	✅	Same generation as 0.1.5
0.1.7-alpha.1 / alpha.2	✅	Same generation as 0.1.5; spot-checked at alpha.2
0.2.0-rc.2	✅	Current Desktop version; verified end-to-end (mount, browser half delivery, selection takes effect)
0.1.3-alpha.2 and earlier	❌	Older generation: only connection.api, no remote.session

The dividing line is 0.1.5: that release replaced the old connection.api face with ctx.remote.session / ctx.modelDirectories and dropped the dsh-client-ui-slots dependency. This plugin is built on the new interfaces, so it cannot load on earlier DSH versions.

A second contract change landed in 0.2.0: select() answers with a result envelope ({ ok: false, error }) instead of rejecting, and directoryFor() throws for a session with no scope or binding. This plugin has handled both shapes since 0.2.3; earlier versions failed silently on 0.2.0.

How this table was produced: each version's dsh-client-ui-model-selection package was unpacked and checked for the modelDirectories / modelCatalog / selectModel interfaces, plus full end-to-end runs on 0.1.5-rc.2 and 0.2.0-rc.2.

Install

With the DSH CLI installed:

dsh plugin --profile web add @domitor-syh/dsh-ui-skin-switcher

Restart dsh web — the button appears next to the input box.

Running dsh from source? Inside the repo root, use your launch command plus dsh plugin --profile web add @domitor-syh/dsh-ui-skin-switcher, for example:

# Normal start
pnpm dsh web
# Add the plugin
pnpm dsh plugin --profile web add @domitor-syh/dsh-ui-skin-switcher

Verify & uninstall

Restart dsh web — the button appears next to the input box and takes effect immediately. Verify with dsh --profile web --dump-config.

Uninstall (if running from source, uninstall the same way you installed): dsh plugin --profile web remove @domitor-syh/dsh-ui-skin-switcher, then restart dsh web.

Usage

1. Pick a model — click the button and pick from the list; the list is grouped by vendor and the current model shows a checkmark.
2. Dial effort — for models declaring reasoningEfforts, an effort button appears to the right of the model; click it, then drag the slider or tap the track to switch levels.

Why is there no reasoning-effort switcher after adding a model?

The current model does not declare a reasoning effort (reasoningEfforts) or vision capability. To keep model declarations accurate, we do not apply a uniform effort preset to every model — check the model vendor's official documentation and patch the underlying config file yourself, or hand the vendor's deep-thinking documentation (or its link) to the LLM and let it modify the config directly.

Taking effect: you edit settings.yaml under the DSH home (~/.dsh) — not this plugin's files; DSH watches that file and hot-reloads, so the change takes effect immediately with no restart and persists across restarts.

Why do it yourself? To keep declarations accurate — accuracy over coverage. Reasoning effort is a per-vendor, per-level wire value; a wrong value silently breaks requests, so we never fill in a guessed preset.

License

MIT