dsh-think-any-lang

A DeepSeek Harness plugin that adds a Thinking Language dropdown under Settings → General, letting you choose which language the model uses for its reasoning / chain of thought (中文, English, 日本語, 한국어, Deutsch, …). The final reply stays in the user's language.

Screenshots · Features · How it works · Installation · Usage · Development · Publishing · Star History

Screenshots

Selector in General settings _{Pick it right from the settings page}	The selector box _{Click to expand and pick a language}
All languages in one dropdown _{off plus 12 languages in one list}	In the plugin list _{Listed under plugin management after install}

Features

Settings → General → Thinking Language: a dropdown to pick the language the model thinks in.
Zero latency, zero extra calls: implemented as a system-prompt instruction (systemPrompt.section) — no extra model calls or response delay like "translate the reasoning" approaches.
Instructions written in the target language: each instruction is written in its own language (e.g. the English instruction is written in English), which improves model adherence.
Persisted: the choice is stored in the user settings document (settings service) and survives restarts.
Plain JS, no build step: both the host and browser halves are hand-written JavaScript; install straight from GitHub with zero friction.

Supported languages: off (follow default, no instruction), Simplified Chinese, English, 日本語, 한국어, Deutsch, Français, Español, Português, Русский, Italiano, العربية, हिन्दी.

How it works

Half	Responsibility
`index.js` (host half)	Registers the `think-any-lang` settings namespace (`language` field, enum, default `zh`); watches for changes and mounts `systemPrompt.section` (named `think-any-lang`) when non-`off`, unmounts on `off`; also registers a private loopback RPC channel `/think-any-lang` (`get`/`set`) that the browser half uses to read/write the namespace
`client.js` (browser half)	Registers a `settings.general.item` row via the `window.__ModuleLoader__.load` contract; renders the dropdown and reads/writes the setting through the host half's `/think-any-lang` RPC channel

Why a private RPC channel instead of the settings RPC surface? dsh-host-apiproxy only exposes an explicit allowlist of settings namespaces to configuration clients (WEB_SETTINGS_NAMESPACES / PRODUCT_SETTINGS_NAMESPACES); a third-party namespace answers settings-not-exposed, so the selection would never persist. The browser half therefore talks to a private channel registered in-process (ctx.connection.rpc.handle), and in-process ctx.settings access is not filtered by that allowlist — persistence and the systemPrompt linkage stay unchanged.

The language table is maintained in two places — index.js (instruction texts) and client.js (display labels): the browser factory's require only resolves platform modules and cannot read local modules, so each half keeps its own language view. Keep both files in sync when adding a language.

Installation

Requirements: dsh CLI installed with an initialized profile (dsh plugin --profile <name> add auto-initializes).

From GitHub (recommended)

dsh plugin --profile web add github:lco117/dsh-think-any-lang

The package is pure JS with no prepare build script, so no pnpm ≥10 allowBuilds approval is needed — install straight from GitHub. Pinning to a commit is recommended as in the official docs: github:lco117/dsh-think-any-lang#<commit-sha>.

From a local directory (development)

dsh plugin --profile web add ./dsh-think-any-lang

Verify

dsh --profile web --dump-config   # should show a "# == dsh-think-any-lang" layer

Usage

Start dsh web.
Open Settings → General.
Pick a language in the Thinking Language dropdown (default: Chinese).
Subsequent model calls receive the thinking-language instruction in the system prompt; DeepSeek reasoning models typically output reasoning_content in the chosen language.

Development

dsh-think-any-lang/
├── package.json       # declares dsh.bundle and dsh.client
├── cordis.patch.yml   # plugin row: mounts both halves of this package
├── index.js           # host half: settings namespace + systemPrompt.section
├── client.js          # browser half: settings row UI (hand-written factory bundle)
├── README.md          # 中文说明
├── README.en-US.md    # English docs
└── screenshots/       # README screenshots (webp)

Tech Stack

Category	Tech
Plugin platform	DeepSeek Harness (DSH)
Plugin framework	Cordis
Language	JavaScript (ESM)
Schema	@deepseek-ai/schemastery
Build	None (plain JS, install straight from GitHub)

License

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dsh-think-any-lang

Install

README