dsh-rustxng

Use a self-hosted RustXNG instance from DeepSeek Harness — and answer the built-in web_search with it.

RustXNG is a SearXNG-compatible metasearch engine written in Rust: one query fans out to about 170 search engines, deduplicates the results and returns them without ads or tracking. This plugin connects DSH to a RustXNG you run yourself (Windows, macOS or Linux) and adds:

Contribution	What it gives you
Search provider	A rustxng provider on the web seam. Point web.searchProvider at it and the built-in web_search is answered by your instance — no DeepSeek search API key involved.
Settings card	A card in Plugins with two live switches and the instance URL. No restart, no hand-edited YAML.
Tools	rustxng_search (engine, category, language and time-range scoped) and rustxng_status (reachability, version, engine count, provider state).
Binary fetcher	node scripts/install-binary.mjs downloads and verifies the right release binary for your OS and CPU.

Nothing in DSH is patched: the plugin uses the documented ctx.web.registerSearchProvider() API and the ordinary web.searchProvider settings field, so it survives Harness upgrades.

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Requirements

• DeepSeek Harness >= 0.2.0-rc.2 < 0.3.0 (host tools, web and settings services). Verified on 0.2.0-rc.2 and 0.2.1-rc.2; see docs/PLATFORMS.md.
• Node.js 20+ (the plugin uses the global fetch)
• A running RustXNG instance — see below

1. Get RustXNG

Easiest: let the plugin fetch a release binary.

node scripts/install-binary.mjs          # into $DSH_HOME/bin (or ~/.dsh/bin)
node scripts/install-binary.mjs --dir ./bin --musl   # Linux without glibc

The script picks the asset for your platform, verifies the published SHA-256, and prints the start command.

Or download it yourself from the releases page:

Platform	Asset
Windows x64	rustxng-v<ver>-x86_64-pc-windows-msvc.exe
macOS arm64	rustxng-v<ver>-aarch64-apple-darwin
macOS x64	rustxng-v<ver>-x86_64-apple-darwin
Linux x64 (glibc)	rustxng-v<ver>-x86_64-unknown-linux-gnu
Linux x64 (musl)	rustxng-v<ver>-x86_64-unknown-linux-musl

Start it:

rustxng --port 8888                       # listens on 127.0.0.1:8888 by default
curl 'http://127.0.0.1:8888/healthz'      # → OK

RustXNG serves its own search UI at http://127.0.0.1:8888/; this plugin does not replace that page, it just consumes the same JSON API.

2. Install the plugin

# registry install (recommended)
dsh plugin --profile web add dsh-rustxng

# or from a checkout of this repository
git clone https://github.com/<owner>/dsh-rustxng.git
# then: Plugin Manager → install bundle → the checkout directory

Installing from a checkout links the directory, so Node resolves the plugin's real path (.../dsh-rustxng). The plugin copes with that: if @deepseek-ai/schemastery is not resolvable from there, it loads the schema builder through the running Harness's own entry point instead of silently dropping the schema.

3. Turn it on

Open Plugins → RustXNG and switch on Use RustXNG for web_search. Or set it in your profile patch (~/.dsh/profiles/<profile>/cordis.patch.yml):

- id: dsh-rustxng
  config:
    baseUrl: http://127.0.0.1:8888
    webSearch:
      enabled: true
      autoSelect: true

From then on web_search is answered by RustXNG. The enabled and autoSelect switches and the instance URL are volatile: the settings card changes them live, and turning the feature off hands web.searchProvider back to whatever it was before.

Configuration

Key	Default	Meaning
enabled	true	Master switch; false unloads the tools and unregisters the provider.
baseUrl	http://127.0.0.1:8888	Where RustXNG listens. Volatile (editable in the card).
timeoutMs	20000	Timeout for one search.
defaultLimit	12	Sources handed to web_search (1–50).
language	''	Search language (ja, en, …); empty = instance default.
timeRange	''	day / week / month / year; empty = no filter.
safeSearch	-1	-1 = instance default, else 0 / 1 / 2.
categories	[]	Category filters applied to every search (general, it, …).
exposeTools	true	Register rustxng_search / rustxng_status.
webSearch.enabled	false	Replace the built-in web_search. Volatile.
webSearch.autoSelect	true	Write web.searchProvider = 'rustxng' for you. Volatile.
debug	false	Log each provider decision.

Tools

// rustxng_search
{ "query": "rust async runtime", "limit": 8, "engine": "arxiv", "time_range": "year" }
{ "query": "東京 天気", "category": "news", "language": "ja" }

rustxng_status reports whether the instance answers, its version, how many engines are enabled, whether the provider is registered, and whether web.searchProvider points at it — run it first when a search fails.

Platform support

Platform	Status
Windows 10/11 x64	Verified: release binary + this plugin (search, provider replacement, settings card) on DSH 0.2.1-rc.2
Linux x64 (glibc / musl)	Verified on WSL2 Ubuntu 26.04: both release builds 12/12 in scripts/verify-linux.sh, plugin tests 15/15; standalone-server run is the final confirmation
macOS arm64 / x64	Supported by design (release assets exist); verification pending

See docs/PLATFORMS.md for how each platform is expected to be verified, binary placement, and the platform-specific notes (PATH, service managers, WSL, musl).

Troubleshooting

Symptom	Fix
RustXNG is not answering at …	Start the instance, or fix baseUrl in the card. rustxng_status shows the probe error.
web_search still fails with a DeepSeek 401	The provider is not selected: check the card's first switch, or web.searchProvider on the official Web search page.
Card missing from Plugins	The plugin row is not active — check Plugin Manager, and that the DSH version matches dsh.compatibility.
Wanted to register a provider but web is missing	The profile has no @deepseek-ai/dsh-web; this plugin needs it for the replacement (the tools still work).
Results look thin	A few engines rate-limit per IP; rustxng_status / RustXNG's /stats show which are suspended. !engine query still works.

Development

node tests/smoke.mjs                               # offline units + live search if an instance answers
RUSTXNG_BASE_URL=http://127.0.0.1:8899 node tests/smoke.mjs

Layout:

index.js                 host plugin: Config, provider + tools wiring, selection hand-over
lib/rustxng-client.js    HTTP client: query building, payload normalisation, timeouts
lib/web-provider.js      the `rustxng` seam provider and the web.searchProvider hand-over
lib/tools.js             rustxng_search / rustxng_status
lib/client.js            settings card (Plugins → RustXNG)
scripts/install-binary.mjs  cross-platform release downloader with SHA-256 check

License and attribution

MIT — see LICENSE.

RustXNG itself is AGPL-3.0-or-later and is not bundled here: the plugin talks to a separate process over HTTP, and scripts/install-binary.mjs downloads it from its own release page. If you redistribute a modified RustXNG, AGPL §13 applies to that work, not to this plugin.