dsh-web-icon-indicator

📖 中文文档 · English · 📝 Changelog · Releases · 🎨 Live demo

⚠️ DSH version support — requires DSH ≥ 0.1.2 (the settings-service API the configuration card uses). Built & verified against DSH 0.1.2-rc.1, the highest version currently tested. On DSH < 0.1.2 the favicon still works, but the settings UI (Settings → Plugins → Plugin config) is unavailable.

Browser tab favicon reflects the current DSH session state — idle / running / asking / done — so you can see at a glance whether a session needs your attention, even when the tab is in the background.

🎨 Live demo — https://waknow.github.io/dsh-web-icon-indicator/ · see the four states, the multi-agent counter and every effect rendered live in your browser, no install needed. The playground even drives the demo page's own tab favicon, exactly like the plugin does on a DSH page.

✨ What it does

• Live session state on the tab favicon — the browser-tab icon mirrors idle / running / asking / done (aggregate priority: asking > running > done > idle), so background tabs tell you at a glance what your agents are doing — including ask_user_question prompts and approval / sandbox-escalation waits, which pin the icon to asking.
• One SVG, recolored & animated in the browser — ships a single whale template (icons/base.svg); every state, color and frame is rendered client-side as a data:image/svg+xml URI. No per-color icon files.
• Six built-in effects — static, blink, breath, rainbow, heartbeat, bounce — all driven by JavaScript, since favicons don't play SVG CSS animations.
• Fully configurable, applied live — every state's color, effect and cycle speed, plus the asking/done hold timings, apply to the running tab within ~1 s — no reload, no restart.
• Built-in settings UI, zero YAML — a Favicon indicator card in the DSH settings page edits the whole config with live color-swatch previews and persists it to settings.yaml for you (path below).
• Background-tab & restart-proof — animated states keep a wall-clock fallback while requestAnimationFrame is paused in hidden tabs, and the status poll self-heals across host restarts. Returning to a tab repaints immediately: a visibilitychange listener fires an instant status fetch, so a state that flipped while the tab was hidden (e.g. the done hold expiring) shows at once instead of waiting for the next — possibly throttled — poll tick. When the backend is stopped, the tab never loses its icon: the outage restores the shell's own favicon from an offline-safe data:-URI copy (or keeps the last painted frame), and the live icon returns on the first successful poll.
• Active-agent count at a glance — while more than one agent is active (non-idle: asking / running / done), the favicon switches from the whale to a full-frame number block showing the live count (up to 99+), colored and animated exactly like the whale would be in that state; back to the whale when 0–1 agents are active. (Same visual language as the 满幅数字 channel in demo/badge.html.)

🛠 Configuration UI — how to get there

Changes are saved through the settings transport into the profile's settings.yaml and applied to the running tab within ~1 s — no reload, no restart. See Configure for the full key reference.

🎬 Default configuration, visualized

The four default states, exactly as they appear in the browser tab (the asking whale really blinks):

Multi-agent, visualized

With several agents running at once, the favicon itself becomes the counter: while more than one agent is active (non-idle: asking / running / done, including the short done hold), the whale is replaced by a full-frame count block showing the live active count, filled with the aggregate state's color and driven by the same effect — so it keeps blinking / breathing / cycling exactly like the whale would. With 0–1 active agents it comes right back to the whale.

State priority is unchanged, so asking still takes over with its red ⇄ yellow 400 ms blink (the count block blinks), done flashes its color for doneHoldMs, and the count refreshes live through the status poll (~1 s). Same visual language as the 满幅数字 channel of demo/badge.html.

✨ All effects, animated

Every preview below is the real whale path, animated the same way the plugin renders it (the previews are self-contained animated SVGs — they play right in your browser):

Effect	What it does	Preview
static	A single colored frame, no motion — uses colors[0]
blink	Toggles colors[0] ⇄ colors[1] (a darker second color is derived if missing) over speed
breath	Pulsates smoothly between colors[0] and colors[1] (derived if missing) over speed
rainbow	Uses colors[0] as the starting hue, then cycles the color wheel over speed
heartbeat	Scale pulses with a sharp lub-dub beat over speed — color is colors[0]
bounce	The whale hops up and down over speed — color is colors[0]

Want to tweak colors and watch the tab favicon change live? Open the self-contained demo (demo/dynamic-color.html) — pick a state + effect, edit colors, and the favicon updates in real time (no build, no dependencies).

Install

This is a standard DSH bundle plugin. Install it into the web profile (the GUI/TUI profiles pick it up automatically through the cordis patch layer).

From npm (recommended):

dsh plugin --profile web add dsh-web-icon-indicator@latest

From the Git source:

dsh plugin --profile web add github:waknow/dsh-web-icon-indicator

Or from a local directory / tarball:

dsh plugin --profile web add <path-or-tarball>

Or drop the directory into ~/.dsh/profiles/web/node_modules/<name>/ and ship a cordis.patch.yml that matches the one shipped here.

Configure

All keys are optional; defaults shown. statusPath and iconPathPrefix are registration-time keys: set them in the composition entry only — they are baked into the route table and the injected script when the plugin mounts, so they are intentionally not part of the settings surface (settings.yaml).

Each entry in states is one object per state: { effect, colors[], speed? }:

config:
  states:
    idle:    { effect: static,    colors: ['#1a1a1a'] }
    running: { effect: static,    colors: ['#FACC15'] }
    asking:  { effect: blink,     colors: ['#E5484D', '#FACC15'], speed: 400 }
    done:    { effect: static,    colors: ['#22A06B'] }

• effect — one of static | blink | breath | rainbow | heartbeat | bounce.
• colors — an array of hex colors. colors[0] is the primary. Multi-color effects read more entries: blink uses colors[0]⇄colors[1], breath breathes colors[0]⇄colors[1] (each derives a darker second color if omitted), rainbow uses only colors[0] as the starting hue.
• speed — optional per-state cycle length in ms (also the blink toggle interval). Default 1200.

Entries are shallow-merged over the defaults, so you can override only a few states. Example:

- id: dsh-web-icon-indicator
  name: 'dsh-web-icon-indicator'
  config:
    states:
      running: { effect: breath,    colors: ['#FF9900', '#FFD9A0'], speed: 900 }
      asking:  { effect: rainbow,   colors: ['#FF0000'] }
      done:    { effect: heartbeat, colors: ['#2ECC71'] }

Settings page & settings.yaml (DSH ≥ 0.1.2)

The plugin registers the whole config surface above with the DSH settings service under the web-icon-indicator namespace (a schemastery schema in lib/index.js):

• Web GUI: open 设置 → 插件 → 插件配置 — a Favicon indicator card edits the same keys (asking/done hold, and per-state effect / colors / cycle), staged and saved through the settings transport. Each state is a collapsible row showing a color dot and a one-line summary (blink · #E5484D ⇄ #FACC15 · 400ms); expanding a row reveals its three fields, and the colors field previews parsed swatches live.
• Persistence: values land in the profile's settings.yaml (default ~/.dsh/settings.yaml) as a web-icon-indicator: section. The composition entry stays the base layer; resolution order is schema defaults → composition entry → settings document user layer.
• No server restart, no tab reload for settings-card saves: askingHoldMs / doneHoldMs apply live host-side, and per-state visual config (effect / colors / cycle) is synced into the running tab through the status poll within ~1 s. Only code-level default changes in lib/index.js need a tab reload (or a DSH web rebuild).
• Route paths are not settings. statusPath / iconPathPrefix are registration-time keys baked into the route table and the injected script, so they live in the composition entry only (see the table above) and a restart is required to change them. They are deliberately absent from the settings schema and from settings.yaml: honoring them there would point the browser at a path the server never serves.
• The settings surface therefore covers askingHoldMs, doneHoldMs, iconsDir and states. iconsDir has no schema default, so it is omitted from the settings document unless a user sets it.
• The browser half is a hand-written lib/client.js (ModuleLoader factory format — no build step, no runtime deps beyond the shell's react). The DSH client scanner picks a new dsh.client declaration up on the next profile start.
• Deployments without a settings service are unaffected: the plugin falls back to reading the composition entry exactly as before.

How it works

• Host plugin with a small browser half: registers routes on the existing webServer — the status JSON endpoint, a static /dsh-web-icon-indicator/base.svg (the whale template), and one tapIndex that injects a small browser script into every served index.html. The config surface is registered with the DSH settings service (web-icon-indicator namespace) for validation, persistence, and the settings-page card (see above).
• Status is aggregated across live agents.list() with priority asking > running > done > idle. The aggregation runs a reconcile() step on every request to detect running → idle transitions, because agent/status's idle delivery is not guaranteed at turn end. The status endpoint also reports active — the number of non-idle agents — and while that count is > 1 the injected script renders a full-frame count block (the 满幅数字 channel of demo/badge.html: a rounded block filled with the same per-frame state color/effect as the whale, bold white count sized 31%–52% of the icon, capped at 99+) instead of the whale, so the tab shows how many agents are busy at once even in a pinned 16px tab.
• ask_user_question tool calls (via tools/pre-execute / tools/result) flip the session into asking with a configurable minimum-hold so the icon stays visible even when the user answers immediately.
• Permission / sandbox-interception waits are also surfaced as asking: when the agent hits a sandbox denial and escalates (sandbox_permissions + justification), or any other tool asks for approval, the approval service appends an approval/asked session event and blocks the agent until you decide. The plugin watches session/event (with an authoritative fold over the live session log as a fallback) and pins the session into the asking state for that whole wait, clearing it on approval/decided.
• The browser script polls /dsh-web-icon-status.json once a second (the interval is fixed at 1000 ms in the injected script — it is not a config key), fetches base.svg once, and then on every requestAnimationFrame tick rebuilds the favicon as a data:image/svg+xml,… URI — replacing the __COLOR__ placeholder with the state's configured color and applying the state's configured effect. The status response also echoes the current per-state visual config, so a settings save reaches the running tab on the next poll (~1 s) without a reload. Browsers don't play favicon SVG CSS animations, so all motion is JS-driven. Because browsers pause requestAnimationFrame in hidden tabs, the poll also repaints a wall-clock frame for animated states, so background tabs keep animating (coarsely) instead of freezing; full-speed animation resumes when the tab is visible again. Returning to a tab also triggers an immediate status fetch and repaint (visibilitychange), so a state that flipped while the tab was hidden shows at once instead of on the next — possibly throttled — poll tick. The poll also survives host restarts — and a stopped backend never blanks the tab: at startup the script caches an offline-safe data:-URI copy of the original favicon, and on a fetch failure it restores that copy (or, if none could be captured, keeps the last painted frame) — it never writes the original server URL back, which would be unreachable exactly while the host is down. It retries every tick, and the live icon returns on the first successful poll (the SPA reconnects in place, so no manual refresh is needed).

Browser support & known limitations

The favicon is a plain image, so browsers never run the SVG's own CSS/JS animation inside the tab UI — every frame is rendered here in JavaScript. How well a changing favicon is displayed differs by browser:

Known limitations (current as of Safari 26.3):

• Favicons have their own cache. Chrome keeps a favicon database, Firefox a favicons.sqlite, and Safari a system-level icon cache — none of which a normal clear cache touches, and WebKit even caches the "no icon" case. That is why a changed icon can linger for an existing tab. The plugin already mitigates this: it serves base.svg and the status endpoint with Cache-Control: no-store, bundles a freshness query (?t=Date.now()) on its fetches, and replaces the <link rel=icon> node on each state change.
• Safari renders SVG favicons but ignores their internal CSS — no @media, no prefers-color-scheme, no CSS animation. So all recoloring must be baked into each frame's markup (which the plugin does) rather than driven by CSS variables.
• data:-URI SVG favicons are unreliable in Safari (WebKit bug 236616, still open; reproduced on Safari 17.6). The plugin currently builds each frame as a data:image/svg+xml URI, so on Safari the tab icon may not render at all — the biggest known gap.
• Dynamic JS updates in Safari are hit-or-miss; they may require a reload, and Safari "locks onto" the first icon it sees. There is no guaranteed, spec-supported way to swap a favicon live in Safari today.
• Pinned-tab icon (<link rel="mask-icon">) uses its own cache, separate from the regular favicon, and is a single-colour silhouette tinted by the color attribute — macOS + pinned-tab only, read at page load, not live.

Full mechanics with sources (WebKit bugs, Stack Overflow, browser-engineering blogs) and a recommended path toward smoother Safari colour changes live in docs/safari-favicon-research.md.

Caveats

• Favicon SVG CSS animations do not run inside the browser's tab UI — all effects are produced in JavaScript by rebuilding the data-URI each frame. This is a deliberate, zero-dependency design. (The animated previews in this README are demo assets for illustration only — the favicon itself is JS-animated.)
• Favicon behavior differs by browser, and Safari is the most limited — see Browser support & known limitations.
• The base template must keep its __COLOR__ placeholder in the #p { fill: … } rule; the browser replaces that token to color each frame.
• The plugin runs in the host plane; it must be mounted into a profile's composition, not a session-scoped agent preset.
• File reads go through the fs service with the configured iconsDir as cwd. Make sure that path is readable under your deployment's sandbox policy.

License

MIT