---
summary: "Browser-based control UI for the Gateway (chat, nodes, config)"
read_when:
  - You want to operate the Gateway from a browser
  - You want Tailnet access without SSH tunnels
title: "Control UI"
---

# Control UI (browser)

The Control UI is a small **Vite + Lit** single-page app served by the Gateway:

- default: `http://<host>:18789/`
- optional prefix: set `gateway.controlUi.basePath` (e.g. `/gensparx`)

It speaks **directly to the Gateway WebSocket** on the same port.

## Quick open (local)

If the Gateway is running on the same computer, open:

- [http://127.0.0.1:18789/](http://127.0.0.1:18789/) (or [http://localhost:18789/](http://localhost:18789/))

If the page fails to load, start the Gateway first: `gensparx gateway`.

Auth is supplied during the WebSocket handshake via:

- `connect.params.auth.token`
- `connect.params.auth.password`
  The dashboard settings panel lets you store a token; passwords are not persisted.
  The onboarding wizard generates a gateway token by default, so paste it here on first connect.

## Device pairing (first connection)

When you connect to the Control UI from a new browser or device, the Gateway
requires a **one-time pairing approval** - even if you're on the same Tailnet
with `gateway.auth.allowTailscale: true`. This is a security measure to prevent
unauthorized access.

**What you'll see:** "disconnected (1008): pairing required"

**To approve the device:**

```bash
# List pending requests
gensparx devices list

# Approve by request ID
gensparx devices approve <requestId>
```

Once approved, the device is remembered and won't require re-approval unless
you revoke it with `gensparx devices revoke --device <id> --role <role>`. See
[Devices CLI](/cli/devices) for token rotation and revocation.

**Notes:**

- Local connections (`127.0.0.1`) are auto-approved.
- Remote connections (LAN, Tailnet, etc.) require explicit approval.
- Each browser profile generates a unique device ID, so switching browsers or
  clearing browser data will require re-pairing.

## Language support

The Control UI can localize itself on first load based on your browser locale, and you can override it later from the language picker in the Access card.

- Supported locales: `en`, `zh-CN`, `zh-TW`, `pt-BR`, `de`, `es`
- Non-English translations are lazy-loaded in the browser.
- The selected locale is saved in browser storage and reused on future visits.
- Missing translation keys fall back to English.

## What it can do (today)

- Overview: connection status, health snapshot, quick actions, recent sessions, attention items, and gateway log tail
- Chat with the model via Gateway WS (`chat.history`, `chat.send`, `chat.abort`, `chat.inject`)
- Stream tool calls + live tool output cards in Chat (agent events)
- Channels: WhatsApp/Telegram/Discord/Slack + plugin channels (Mattermost, etc.) status + QR login + per-channel config (`channels.status`, `web.login.*`, `config.patch`)
- Instances: presence list + refresh (`system-presence`)
- Sessions: list + per-session thinking/verbose overrides (`sessions.list`, `sessions.patch`)
- Cron jobs: list/add/edit/run/enable/disable + run history (`cron.*`)
- Skills: installed inventory, readiness summary, catalog search, install, enable/disable, API key updates (`skills.*`)
- Nodes: list + caps (`node.list`)
- Exec approvals: edit gateway or node allowlists + ask policy for `exec host=gateway/node` (`exec.approvals.*`)
- Config: view/edit `~/.gensparx/gensparx.json` (`config.get`, `config.set`)
- Config: apply + restart with validation (`config.apply`) and wake the last active session
- Config writes include a base-hash guard to prevent clobbering concurrent edits
- Config schema + form rendering (`config.schema`, including plugin + channel schemas); Raw JSON editor remains available
- Debug: status/health/models snapshots + event log + manual RPC calls (`status`, `health`, `models.list`)
- Logs: live tail of gateway file logs with filter/export (`logs.tail`)
- Update: run a package/git update + restart (`update.run`) with a restart report

The intended first-run flow is:

1. Open the dashboard URL.
2. Enter the gateway URL plus token or password on the connect screen.
3. Land on the overview page to confirm health, then move into sessions, skills, or config.

Cron jobs panel notes:

- For isolated jobs, delivery defaults to announce summary. You can switch to none if you want internal-only runs.
- Channel/target fields appear when announce is selected.
- Webhook mode uses `delivery.mode = "webhook"` with `delivery.to` set to a valid HTTP(S) webhook URL.
- For main-session jobs, webhook and none delivery modes are available.
- Advanced edit controls include delete-after-run, clear agent override, cron exact/stagger options,
  agent model/thinking overrides, and best-effort delivery toggles.
- Form validation is inline with field-level errors; invalid values disable the save button until fixed.
- Set `cron.webhookToken` to send a dedicated bearer token, if omitted the webhook is sent without an auth header.
- Deprecated fallback: stored legacy jobs with `notify: true` can still use `cron.webhook` until migrated.

## Chat behavior

- `chat.send` is **non-blocking**: it acks immediately with `{ runId, status: "started" }` and the response streams via `chat` events.
- Re-sending with the same `idempotencyKey` returns `{ status: "in_flight" }` while running, and `{ status: "ok" }` after completion.
- `chat.history` responses are size-bounded for UI safety. When transcript entries are too large, Gateway may truncate long text fields, omit heavy metadata blocks, and replace oversized messages with a placeholder (`[chat.history omitted: message too large]`).
- `chat.inject` appends an assistant note to the session transcript and broadcasts a `chat` event for UI-only updates (no agent run, no channel delivery).
- Stop:
  - Click **Stop** (calls `chat.abort`)
  - Type `/stop` (or standalone abort phrases like `stop`, `stop action`, `stop run`, `stop gensparx`, `please stop`) to abort out-of-band
  - `chat.abort` supports `{ sessionKey }` (no `runId`) to abort all active runs for that session
- Abort partial retention:
  - When a run is aborted, partial assistant text can still be shown in the UI
  - Gateway persists aborted partial assistant text into transcript history when buffered output exists
  - Persisted entries include abort metadata so transcript consumers can tell abort partials from normal completion output

## Tailnet access (recommended)

### Integrated Tailscale Serve (preferred)

Keep the Gateway on loopback and let Tailscale Serve proxy it with HTTPS:

```bash
gensparx gateway --tailscale serve
```

Open:

- `https://<magicdns>/` (or your configured `gateway.controlUi.basePath`)

By default, Control UI/WebSocket Serve requests can authenticate via Tailscale identity headers
(`tailscale-user-login`) when `gateway.auth.allowTailscale` is `true`. Gensparx
verifies the identity by resolving the `x-forwarded-for` address with
`tailscale whois` and matching it to the header, and only accepts these when the
request hits loopback with Tailscale's `x-forwarded-*` headers. Set
`gateway.auth.allowTailscale: false` (or force `gateway.auth.mode: "password"`)
if you want to require a token/password even for Serve traffic.
Tokenless Serve auth assumes the gateway host is trusted. If untrusted local
code may run on that host, require token/password auth.

### Bind to tailnet + token

```bash
gensparx gateway --bind tailnet --token "$(openssl rand -hex 32)"
```

Then open:

- `http://<tailscale-ip>:18789/` (or your configured `gateway.controlUi.basePath`)

Paste the token into the UI settings (sent as `connect.params.auth.token`).

## Insecure HTTP

If you open the dashboard over plain HTTP (`http://<lan-ip>` or `http://<tailscale-ip>`),
the browser runs in a **non-secure context** and blocks WebCrypto. By default,
gensparx **blocks** Control UI connections without device identity.

**Recommended fix:** use HTTPS (Tailscale Serve) or open the UI locally:

- `https://<magicdns>/` (Serve)
- `http://127.0.0.1:18789/` (on the gateway host)

**Insecure-auth toggle behavior:**

```json5
{
  gateway: {
    controlUi: { allowInsecureAuth: true },
    bind: "tailnet",
    auth: { mode: "token", token: "replace-me" },
  },
}
```

`allowInsecureAuth` does not bypass Control UI device identity or pairing checks.

**Break-glass only:**

```json5
{
  gateway: {
    controlUi: { dangerouslyDisableDeviceAuth: true },
    bind: "tailnet",
    auth: { mode: "token", token: "replace-me" },
  },
}
```

`dangerouslyDisableDeviceAuth` disables Control UI device identity checks and is a
severe security downgrade. Revert quickly after emergency use.

See [Tailscale](/gateway/tailscale) for HTTPS setup guidance.

## Building the UI

The Gateway serves static files from `dist/control-ui`. Build them with:

```bash
pnpm ui:build # auto-installs UI deps on first run
```

Optional absolute base (when you want fixed asset URLs):

```bash
GENSPARX_CONTROL_UI_BASE_PATH=/gensparx/ pnpm ui:build
```

For local development (separate dev server):

```bash
pnpm ui:dev # auto-installs UI deps on first run
```

Then point the UI at your Gateway WS URL (e.g. `ws://127.0.0.1:18789`).

## Debugging/testing: dev server + remote Gateway

The Control UI is static files; the WebSocket target is configurable and can be
different from the HTTP origin. This is handy when you want the Vite dev server
locally but the Gateway runs elsewhere.

1. Start the UI dev server: `pnpm ui:dev`
2. Open a URL like:

```text
http://localhost:5173/?gatewayUrl=ws://<gateway-host>:18789
```

Optional one-time auth (if needed):

```text
http://localhost:5173/?gatewayUrl=wss://<gateway-host>:18789&token=<gateway-token>
```

Notes:

- `gatewayUrl` is stored in localStorage after load and removed from the URL.
- `token` is stored in localStorage; `password` is kept in memory only.
- When `gatewayUrl` is set, the UI does not fall back to config or environment credentials.
  Provide `token` (or `password`) explicitly. Missing explicit credentials is an error.
- Use `wss://` when the Gateway is behind TLS (Tailscale Serve, HTTPS proxy, etc.).
- `gatewayUrl` is only accepted in a top-level window (not embedded) to prevent clickjacking.
- Non-loopback Control UI deployments must set `gateway.controlUi.allowedOrigins`
  explicitly (full origins). This includes remote dev setups.
- `gateway.controlUi.dangerouslyAllowHostHeaderOriginFallback=true` enables
  Host-header origin fallback mode, but it is a dangerous security mode.

Example:

```json5
{
  gateway: {
    controlUi: {
      allowedOrigins: ["http://localhost:5173"],
    },
  },
}
```

Remote access setup details: [Remote access](/gateway/remote).
