System Notifications · DeepSeek Harness plugin

A client-only plugin for the DeepSeek Harness (dsh) Web UI that raises a desktop notification when a session needs you, and jumps back to that session when you click it.

• A session waits for permission approval / an answer / a plan review → notification.
• A session finishes a run (running flips true → false) → notification.
• Clicking the notification brings the browser window to the front and opens that session.
• Settings live in Settings → General → System Notifications.

Notifications are edge-triggered: the first snapshot after page load is taken as the baseline, so a refresh never floods you with a backlog.

Version 1.1.0 — notification titles name the project (Project · Event, e.g. harness-plugins · Approval required), and the body names the session.

Requirements

• DeepSeek Harness with plugin support (engines.dsh: >=0.2.1-rc.2), Web GUI served in a Chromium-based browser (Chrome/Edge). http://127.0.0.1 is a secure context, so no HTTPS is required for the Notification API.
• The page must stay open — notifications are raised by the page's JavaScript, not by the host.

Install

The package is not published on npm yet; install it straight from this repository:

dsh plugin --profile web add github:purejiang/dsh-system-notifications

Or in the Web UI: Plugins → Install, and paste github:purejiang/dsh-system-notifications.

The plugin is build-free: it ships index.js (an empty host half that registers the bundle row) and client.js (the whole feature). Refreshing the page after install is enough.

Enable and test

1. Open Settings → General → System Notifications and switch it on.
2. Grant the browser's notification permission. The plugin asks once, on your first click or keypress after the page loads; you can also use the Authorize button in the same row. If you dismissed or denied the prompt, allow http://127.0.0.1:3080 in chrome://settings/content/notifications (or the site icon in the address bar) and retry.
3. The Test notification button is hidden in the shipped UI. To use it, double-click the row title “System Notifications” (stored per session in sessionStorage), or open the page with ?dshNotificationTest=1.

Behaviour

• When: a new pendingInteraction appears (approval, question, or plan-review), or running changes from true to false.
• Title: <project> · <event>. The project is the title of the workspace that owns the session (the default workspace is localized, e.g. “Default Workspace”); if the workspace list is not loaded yet it falls back to the directory name of the session's cwd.
• Body: the session's display title plus the reason, e.g. ““Refactor the toolbar” requests to run bash and is waiting for your approval.” Approval notifications include the tool name; completion notifications include the elapsed time when the plugin observed the whole run.
• Icon: the embedded 128×128 DeepSeek whale mark (PNG data URL, no external requests).
• Quiet while you watch: no notification while that session's conversation panel is visible and the window has focus.
• No noise: subagent sessions are skipped, duplicate notifications collapse per session (tag), and at most 6 notifications are kept open.

Settings row

The row is built from the host's own primitives (Switch/Button from @deepseek-ai/dsh-client-ui-primitives), so its spacing and type match the built-in settings rows. It shows the current state and explains why notifications are off when the browser permission is denied.

How it works

Everything is done through documented client extension points; no host-side code is needed:

Need	Extension point
Detect waiting / finished	shell.overlay component reading props.useSessionStatus()
Session title	props.useSessions() → SessionListState.byId[id].displayTitle
Project name	props.useWorkspaces() (workspace title / session ownership), fallback to cwd
Am I looking at it	props.usePanelInfo().activePanelId, document.hasFocus(), visibilityState
Raise the notification	the browser Notification API
Click → open session	ctx.get('uiWorkspace').openSession(sessionId)
Settings controls	settings.general.item

The running transition is observed both through React snapshots and by subscribing to the client uiSession.sessionStatus store, because background tabs throttle rendering and would otherwise coalesce a short run into no visible change.

Files

package.json          # dsh.bundle + dsh.client declarations
cordis.patch.yml      # inserts the bundle row
index.js              # host half: registers the bundle, no logic
client.js             # observer, project-name resolution, session tracker, settings row
locale/en.json        # plugin list title/description (English)
locale/zh.json        # plugin list title/description (Chinese)
icon.svg              # plugin list / settings row icon
notification-icon.png # notification icon source (also embedded in client.js)
notification-icon.svg # vector source of the notification icon

Limitations

• The page must remain open; a closed tab cannot notify.
• Notification layout (font, colour, extra buttons) is controlled by the browser and the OS.
• Clicking an old notification after a page reload focuses the window but may not reopen the session (the page context is gone).
• Notification titles are truncated by the OS; the project name is placed first so it stays visible.
• If the browser permission is denied, nothing is sent and the settings row states the reason.

License

MIT