diff --git a/src/renderer/src/components/broker/BrokerDetailsPage.tsx b/src/renderer/src/components/broker/BrokerDetailsPage.tsx
index 3d2dfbd3..c7c4c184 100644
--- a/src/renderer/src/components/broker/BrokerDetailsPage.tsx
+++ b/src/renderer/src/components/broker/BrokerDetailsPage.tsx
@@ -7,6 +7,7 @@ import {
   Check,
   Cloud,
   Copy,
+  ExternalLink,
   KeyRound,
   List,
   MessageSquare,
@@ -99,6 +100,11 @@ function compactValue(value: string | undefined, fallback = 'n/a'): string {
   return value?.trim() || fallback
 }
 
+function observerUrlForWorkspaceKey(workspaceKey: string | undefined): string | undefined {
+  const key = workspaceKey?.trim()
+  return key ? `https://agentrelay.com/observer?key=${encodeURIComponent(key)}` : undefined
+}
+
 function getPrimaryRelaycastWorkspace(
   broker: BrokerDetails
 ): NonNullable<BrokerDetails['relaycast']>['workspaces'][number] | undefined {
@@ -377,11 +383,13 @@ function DetailField({
 function CompactMetaRow({
   label,
   value,
-  copyValue
+  copyValue,
+  action
 }: {
   label: string
   value: string
   copyValue?: string
+  action?: React.ReactNode
 }): React.ReactNode {
   return (
     <div className="grid min-w-0 grid-cols-[126px_minmax(0,1fr)_auto] items-center gap-2 border-b border-[var(--pear-border-subtle)] py-2 last:border-b-0">
@@ -389,16 +397,40 @@ function CompactMetaRow({
       <span className="min-w-0 truncate font-mono text-[12px] text-[var(--pear-text-secondary)]" title={value}>
         {value}
       </span>
-      {copyValue ? <CopyButton value={copyValue} label="Copy" /> : <span />}
+      {copyValue || action ? (
+        <span className="inline-flex shrink-0 items-center gap-1.5">
+          {action}
+          {copyValue ? <CopyButton value={copyValue} label="Copy" /> : null}
+        </span>
+      ) : (
+        <span />
+      )}
     </div>
   )
 }
 
+function ObserverLink({ href }: { href: string }): React.ReactNode {
+  return (
+    <a
+      href={href}
+      target="_blank"
+      rel="noreferrer"
+      className="inline-flex h-7 shrink-0 items-center gap-1.5 rounded-md border border-[var(--pear-border-subtle)] px-2 text-[11px] text-[var(--pear-text-dim)] hover:border-[var(--pear-accent-dim)] hover:bg-[var(--pear-bg-surface-hover)] hover:text-[var(--pear-text)]"
+      title="Join as observer"
+      aria-label="Join workspace as observer"
+    >
+      <ExternalLink size={12} />
+      <span>Join</span>
+    </a>
+  )
+}
+
 function BrokerMetadataSummary({ broker }: { broker: BrokerDetails }): React.ReactNode {
   const apiKey = broker.apiKey || (broker.apiKeyAvailable ? 'stored in connection file' : 'n/a')
   const primaryWorkspace = getPrimaryRelaycastWorkspace(broker)
   const workspaceId = broker.relaycast?.defaultWorkspaceId || primaryWorkspace?.workspaceId
   const workspaceKey = broker.relaycast?.workspaceKey || broker.session?.workspaceKey
+  const observerUrl = observerUrlForWorkspaceKey(workspaceKey)
   const workspaceAlias = primaryWorkspace?.workspaceAlias || undefined
   const selfAgent = primaryWorkspace
     ? `${primaryWorkspace.selfName} / ${primaryWorkspace.selfAgentId}`
@@ -423,7 +455,12 @@ function BrokerMetadataSummary({ broker }: { broker: BrokerDetails }): React.Rea
         value={compactValue(workspaceAlias ? `${workspaceAlias} (${workspaceId || 'no id'})` : workspaceId)}
         copyValue={workspaceId}
       />
-      <CompactMetaRow label="Workspace key" value={compactValue(workspaceKey)} copyValue={workspaceKey} />
+      <CompactMetaRow
+        label="Workspace key"
+        value={compactValue(workspaceKey)}
+        copyValue={workspaceKey}
+        action={observerUrl ? <ObserverLink href={observerUrl} /> : undefined}
+      />
       <CompactMetaRow label="Self agent" value={selfAgent} copyValue={primaryWorkspace?.selfAgentId} />
       <CompactMetaRow
         label="Runtime"
diff --git a/src/renderer/src/hooks/use-message-reconciliation.test.ts b/src/renderer/src/hooks/use-message-reconciliation.test.ts
index 82a1d32c..d3bc2a6f 100644
--- a/src/renderer/src/hooks/use-message-reconciliation.test.ts
+++ b/src/renderer/src/hooks/use-message-reconciliation.test.ts
@@ -105,6 +105,13 @@ describe('getActiveMessageReconciliationRequest', () => {
     })).toBeNull()
   })
 
+  it('polls only visible active chat rooms', () => {
+    expect(hooks.shouldPollActiveRoom('channel:project-1:general', 'visible')).toBe(true)
+    expect(hooks.shouldPollActiveRoom('dm:project-1:human|worker', 'visible')).toBe(true)
+    expect(hooks.shouldPollActiveRoom('none', 'visible')).toBe(false)
+    expect(hooks.shouldPollActiveRoom('channel:project-1:general', 'hidden')).toBe(false)
+  })
+
   it('builds a channel reconciliation request from broker channel message events', () => {
     expect(hooks.getBrokerEventMessageReconciliationRequest({
       event: {
@@ -515,4 +522,11 @@ describe('createMessageReconciler', () => {
     expect(source).toMatch(/scheduleHumanMessageSentReconciliation\([\s\S]*lastHumanMessageSentAt[\s\S]*reconciler/)
     expect(source).toMatch(/\[lastHumanMessageSentAt,\s*reconciler\]/)
   })
+
+  it('wires active chat rooms into periodic reconciliation', () => {
+    const source = hooks.useMessageReconciliation.toString()
+    expect(source).toContain('ACTIVE_ROOM_RECONCILE_POLL_MS')
+    expect(source).toContain('active-room-poll')
+    expect(source).toMatch(/shouldPollActiveRoom\([\s\S]*activeRoomKey[\s\S]*document\.visibilityState/)
+  })
 })
diff --git a/src/renderer/src/hooks/use-message-reconciliation.ts b/src/renderer/src/hooks/use-message-reconciliation.ts
index 8fd831d4..2249a02c 100644
--- a/src/renderer/src/hooks/use-message-reconciliation.ts
+++ b/src/renderer/src/hooks/use-message-reconciliation.ts
@@ -13,6 +13,7 @@ import type {
 
 const DEFAULT_RECONCILE_LIMIT = 50
 const DEFAULT_RECONCILE_DEBOUNCE_MS = 750
+export const ACTIVE_ROOM_RECONCILE_POLL_MS = 3_000
 const BROKER_CONNECTED_STATUSES = new Set([
   'connected',
   'event_stream_connected',
@@ -312,6 +313,10 @@ function refreshEventStream(reason: string): void {
   void broker?.refreshEventStream?.(projectId, reason)?.catch(() => undefined)
 }
 
+export function shouldPollActiveRoom(activeRoomKey: string, visibilityState: DocumentVisibilityState): boolean {
+  return activeRoomKey !== 'none' && visibilityState === 'visible'
+}
+
 export function useMessageReconciliation(): void {
   const activeProjectId = useProjectStore((s) => s.activeProjectId)
   const activeTabId = useUIStore((s) => s.activeTabId)
@@ -350,6 +355,16 @@ export function useMessageReconciliation(): void {
     reconciler.schedule('active-room')
   }, [activeRoomKey, reconciler])
 
+  useEffect(() => {
+    if (activeRoomKey === 'none') return
+    const interval = window.setInterval(() => {
+      if (shouldPollActiveRoom(activeRoomKey, document.visibilityState)) {
+        reconciler.schedule('active-room-poll')
+      }
+    }, ACTIVE_ROOM_RECONCILE_POLL_MS)
+    return () => window.clearInterval(interval)
+  }, [activeRoomKey, reconciler])
+
   useEffect(() => {
     if (brokerStatus === 'connected') {
       refreshEventStream('broker-status')