dsh-plugin-example

A DeepSeek Harness plugin in ~70 lines: one sidebar tab that says hello and counts clicks. It exists to be read, copied, and installed in one command.

dsh plugin add dsh-plugin-example

What it shows

Piece	Where	Why it is worth copying
The bundle envelope	client.js first and last lines	A client plugin is one file calling window.__ModuleLoader__.load({ id, factory }). No bundler, no relative imports.
The tab	apply() → sidebarRightTabs.register	kind is what the tab is opened by; title is a function, because it is re-read when the language changes.
The body	slots.register({ name: 'sidebar.right.pane.tab', key })	The host injects the pane; you render its contents and inherit its theme.
Two languages	COPY + ctx.locale.register	Keys missing from one language fall back to the other, so a half-translated plugin still renders.
The host half	index.js	Empty here on purpose: a plugin with nothing to serve does not need routes.

Test it

npm install
npm test

The one test mounts the real client.js in jsdom with the real React, through dsh-plugin-toolkit:

const panel = await mountClient({ file: 'client.js' });
assert.equal(panel.text(), 'Hello from a plugin');
await panel.click('[data-testid="bump"]');
assert.match(panel.text(), /Clicks: 1/);

That is the difference between "the bundle parses" and "the button works".

Requirements

Harness	>=0.2.0 (the version that ships sidebarRightTabs)
Node	>=18, for the test only
Permissions	none: no network, no key, no telemetry

License

Apache-2.0.