diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/README.md b/.github/pr-screenshots/2162-cloud-channel-marks/README.md
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+# Mobile cloud channel name marks — UAT evidence
+
+Issue #2161 / Draft PR #2162. Assigned shared iOS Simulator batch 20, 2026-10-18. No Prod, native build/install, remote PR merge or WorkOS settings changes.
+
+- Before: `c183a2df0ed891c351da90a7937c81b38ee4597e`.
+- After: `42c900eb790fe2dd5b4c00553a24b4f5607a8ff7` (runtime code identical to `6c7557419c2d39efe8e7a9fb0026938c827e1f1e`).
+- Native inputs unchanged from installed `494a20f1eb4f0666a2c90bc3c758af4e7ff5f46b`; existing development client, 402 × 874 screenshot pixels, English.
+- Cloud service UAT release `3eeed5b05782276b1a02cc2412dd04ab0ec60bca`. Actual service data; independent synthetic user session.
+
+## Display checks
+
+48 unmodified screenshots: before/after × member/guest × list/conversation heading × default/intermediate/maximum × light/dark. The three iOS content sizes are `large`, `accessibility-medium`, `accessibility-extra-extra-extra-large`. Matching filenames identify each pair; JSON records count six completed cases per surface. AX snapshots separately asserted the unchanged channel name and the new `Cloud channel` accessible label.
+
+The trailing cloud appears on both list names and conversation headings. Short names stay adjacent; long names wrap with glyph space reserved. Maximum-size content scrolls: a screenshot may show only part of the whole card or action. Actual maximum-size interactions returned to the list and opened the guest channel successfully. The Expo development-menu gear is present in these authentic development-client captures; it partly overlaps the glyph in the maximum guest-title viewport. This overlay is not application UI or proof that every pixel is unobscured. The same glyph is visible in the remaining sizes and list view.
+
+## Access and session checks
+
+The synthetic B user has ordinary member access to one workspace and only a direct channel grant in another. CLI verified no membership in the guest channel's organization and denied sibling-channel access. After capture, only this run's guest invitation was revoked: both revoked-channel and sibling access were denied, and the native refreshed list showed no guest channels. Both independent CLI sessions remained valid.
+
+The mobile session survived cold restart and service verification. Its checkpoint kept the same session identity while refresh credentials rotated. Logout verification is recorded in the PR's batch result; do not infer logout from these screenshots alone.
+
+## Retained first failures and limits
+
+- Initial CI failed only the design table's formatting; corrected before this frozen runtime, then all applicable CI checks passed (run 39098033103).
+- The first after attempt still loaded baseline JS because CI-mode Metro did not watch the checkout update. Its assertion failed; restarting only the assigned Metro loaded the frozen code. That attempt is excluded from these 48 cases.
+- After resizing, an offscreen open button did not match. An erroneous subsequent title capture was discarded; the driver now checks the correct surface before collecting cases. The successful rerun produced these title files.
+- A sandboxed driver read reported its daemon unreachable; the authorized simulator call succeeded without replacing or deleting shared daemon state.
+- iOS native display/interaction evidence only. Android native, VoiceOver spoken output, physical iPhone and Human acceptance remain unverified. Source tests/CI and this Simulator run are distinct evidence.
+- This slice does not implement desktop origin projection, cloud organization entries in the left sheet, or invitation URL/QR sharing. It does not close issue #2161 or the wider collaboration goal.
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+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  }
+]
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+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  }
+]
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+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  }
+]
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+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": true
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": true
+  }
+]
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+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  }
+]
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@@ -0,0 +1,38 @@
+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  }
+]
diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-default-dark.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-default-dark.png
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index 0000000000..476310e89a
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-intermediate-dark.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-intermediate-dark.png
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new file mode 100644
index 0000000000..5854bd336b
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-maximum-dark.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-maximum-dark.png
new file mode 100644
index 0000000000..e5bdac0b24
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-maximum-light.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list-maximum-light.png
new file mode 100644
index 0000000000..d540a51e3e
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list.json b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list.json
new file mode 100644
index 0000000000..75638a414e
--- /dev/null
+++ b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-list.json
@@ -0,0 +1,38 @@
+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  }
+]
diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-default-dark.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-default-dark.png
new file mode 100644
index 0000000000..bfebcc0071
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-default-light.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-default-light.png
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index 0000000000..2baf925dc9
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-intermediate-dark.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-intermediate-dark.png
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-intermediate-light.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-intermediate-light.png
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index 0000000000..528538d771
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-maximum-dark.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-maximum-dark.png
new file mode 100644
index 0000000000..384feda8ca
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-maximum-light.png b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title-maximum-light.png
new file mode 100644
index 0000000000..76e9ae4a0a
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diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title.json b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title.json
new file mode 100644
index 0000000000..75638a414e
--- /dev/null
+++ b/.github/pr-screenshots/2162-cloud-channel-marks/before-member-title.json
@@ -0,0 +1,38 @@
+[
+  {
+    "size": "large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-medium",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "light",
+    "nameVisible": true,
+    "cloudLabel": false
+  },
+  {
+    "size": "accessibility-extra-extra-extra-large",
+    "theme": "dark",
+    "nameVisible": true,
+    "cloudLabel": false
+  }
+]
diff --git a/.github/pr-screenshots/2162-cloud-channel-marks/revoked-guest-list.png b/.github/pr-screenshots/2162-cloud-channel-marks/revoked-guest-list.png
new file mode 100644
index 0000000000..baa6dcbdb9
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diff --git a/apps/mobile/src/ui/cloud/channel-name.tsx b/apps/mobile/src/ui/cloud/channel-name.tsx
new file mode 100644
index 0000000000..ebb0850339
--- /dev/null
+++ b/apps/mobile/src/ui/cloud/channel-name.tsx
@@ -0,0 +1,25 @@
+import { View } from 'react-native';
+import { useDesignTheme } from '../design/theme';
+import { space } from '../design/tokens';
+import { Text } from '../primitives/text';
+import { CloudIcon } from '../shell/icons';
+import { t } from '../strings';
+
+export function CloudChannelName({ name }: { name: string }) {
+  const theme = useDesignTheme();
+  return (
+    <View
+      accessible
+      accessibilityRole="header"
+      accessibilityLabel={`${name} · ${t.cloudChannels.cloudChannel}`}
+      style={{ flexDirection: 'row', alignItems: 'center', gap: space.x2 }}
+    >
+      <Text variant="title" style={{ flexShrink: 1 }}>
+        {name}
+      </Text>
+      <View accessibilityElementsHidden importantForAccessibility="no-hide-descendants">
+        <CloudIcon color={theme.color.subtle} size={theme.type.title.size * theme.fontScale} />
+      </View>
+    </View>
+  );
+}
diff --git a/apps/mobile/src/ui/cloud/channels-screen.tsx b/apps/mobile/src/ui/cloud/channels-screen.tsx
index 0ef08a60d1..b82c669137 100644
--- a/apps/mobile/src/ui/cloud/channels-screen.tsx
+++ b/apps/mobile/src/ui/cloud/channels-screen.tsx
@@ -12,6 +12,7 @@ import { KeyboardFormScroll } from '../primitives/keyboard-form';
 import { Text } from '../primitives/text';
 import { TextInput } from '../primitives/system-text';
 import { t } from '../strings';
+import { CloudChannelName } from './channel-name';
 
 function ChannelFormScroll({
   actionLines = 2,
@@ -166,7 +167,7 @@ function ChannelWorkspace({
             <Text>{t.cloudChannels.selectWorkspace}</Text>
           ) : selected ? (
             <>
-              <Text variant="title">{selected.name}</Text>
+              <CloudChannelName name={selected.name} />
               {guest && <Text>{t.cloudGuests.hint}</Text>}
               {!guest && (
                 <Button
@@ -306,7 +307,7 @@ function ChannelWorkspace({
           </View>
         ) : (
           <View style={box}>
-            <Text variant="title">{item.name}</Text>
+            <CloudChannelName name={item.name} />
             <Button
               label={t.cloudChannels.open + ': ' + item.name}
               disabled={busy}
diff --git a/apps/mobile/src/ui/shell/icons.tsx b/apps/mobile/src/ui/shell/icons.tsx
index 0df6dc0fee..21124d06a1 100644
--- a/apps/mobile/src/ui/shell/icons.tsx
+++ b/apps/mobile/src/ui/shell/icons.tsx
@@ -31,6 +31,10 @@ function Glyph({ d, color, size, focused = false }: IconProps & { d: string }) {
   );
 }
 
+export function CloudIcon(props: IconProps) {
+  return <Glyph {...props} d="M6 18h12a4 4 0 0 0 .2-8A6.5 6.5 0 0 0 5.7 9.1 4.5 4.5 0 0 0 6 18Z" />;
+}
+
 export function ChatsIcon(props: IconProps) {
   return (
     <Glyph
diff --git a/apps/mobile/src/ui/strings.ts b/apps/mobile/src/ui/strings.ts
index 3be2177c34..138d3a4b11 100644
--- a/apps/mobile/src/ui/strings.ts
+++ b/apps/mobile/src/ui/strings.ts
@@ -116,6 +116,7 @@ const en = {
   },
   cloudChannels: {
     title: 'Cloud channels',
+    cloudChannel: 'Cloud channel',
     name: 'Channel name',
     create: 'Create channel',
     retryCreate: 'Retry channel creation',
@@ -1012,6 +1013,7 @@ const zh: typeof en = {
   },
   cloudChannels: {
     title: '云频道',
+    cloudChannel: '云频道',
     name: '频道名称',
     create: '创建频道',
     retryCreate: '重试创建频道',
diff --git a/changes/2161-cloud-channel-marks.md b/changes/2161-cloud-channel-marks.md
new file mode 100644
index 0000000000..80292ee946
--- /dev/null
+++ b/changes/2161-cloud-channel-marks.md
@@ -0,0 +1,11 @@
+---
+section: Changed
+---
+
+## en
+
+- Show a trailing cloud icon beside channel names in the mobile cloud channel list and conversation heading, with an accessible cloud-channel label. ([#2161](https://github.com/BotHarness/DeepSeekBot/issues/2161))
+
+## zh
+
+- 在手机云频道列表和会话标题的频道名后显示云图标，并提供可读的云频道无障碍标识。([#2161](https://github.com/BotHarness/DeepSeekBot/issues/2161))
diff --git a/docs/architecture/cloud-navigation.md b/docs/architecture/cloud-navigation.md
new file mode 100644
index 0000000000..34f64bd449
--- /dev/null
+++ b/docs/architecture/cloud-navigation.md
@@ -0,0 +1,45 @@
+# Cloud navigation and sharing
+
+User-confirmed direction, issue [#2161](https://github.com/BotHarness/DeepSeekBot/issues/2161). This document describes the target UX; the first implementation only marks existing direct-cloud channel titles. UAT only; no merge or Prod.
+
+## Channel identity
+
+Place an outline cloud glyph directly after a cloud channel's displayed name in the channel list and conversation header. Keep the name as text, allow wrapping/ellipsis according to its existing surface, reserve glyph space and announce "Cloud channel" to assistive technology. Cloud identity is stable provenance, not presence, connectivity, subscription status or an unread indicator. Disconnection does not remove the mark.
+
+A local group with mirrored external messages is still a local group. Its cloud connection can be shown separately, but neither the last author nor presence of a cloud-origin message proves remote channel ownership. Desktop list/header need the same authoritative origin projection before using the cloud-channel mark. Do not rename stored channel names or append a Unicode symbol to API data.
+
+## One left sheet, two kinds of destination
+
+Reuse the native app's existing left sheet. Group destinations into Computers and Cloud workspaces. Computer entries retain current Host connection/switching behavior. Cloud entries use the cloud instance and organization as their identity; selecting one filters channels through the cloud service and does not require a local Host.
+
+A cloud organization entry may represent full membership or access to only one or more invited channels. Both show the organization name/icon. Channel guests are labeled "Guest" and see only granted channels; they cannot list other channels, members, organization settings, or create channels. An organization icon is a navigation aid, not proof of membership. Server authorization enforces this before returning data. If a user has both membership and a direct grant, show one organization entry; removing membership must recompute access from the remaining grants.
+
+Use `(instanceId, organizationId)` keys so identical names across self-hosted services do not collide. Show the service domain in details or when names collide. Keep selected cloud destination separate from selected local Host. No channel-only guest is auto-promoted into an organization.
+
+## Create, share, join
+
+The primary channel-list action is **Create or join**: Create channel, Join with invitation (paste URL or scan), and a secondary Connect cloud service option for users who only have a deployment address. The service instance is not the collaboration destination and must not become a compulsory server-management step. A direct invitation carries the target through necessary instance trust and sign-in; the user then confirms and lands in that channel. A bare service address can connect an instance but cannot grant organization or channel membership.
+
+The join preview shows organization name/icon, channel name and cloud mark, explicit organization-versus-channel-only access, service domain, current instance account, and Join/Open/Sign in as appropriate. Only disclose metadata the service authorizes; a recipient-bound invitation can show a neutral sign-in preview until verified. Keep the pending target across browser return and cold launch, without redirecting a cloud-only user to computer pairing. Wrong-account, expired/revoked and unavailable-service states preserve a clear recovery path. Registration may provision a default organization internally, but joining an invitation must not detour into creating/configuring that organization.
+
+[Slack/Discord primary-source research](../research/2026-10-18-cloud-join-ux.md) supports combining create/join and destination-first invitation flows. Discord's channel-created invite still joins its server; TOB's channel-only access instead resembles Slack guest scope. Slack Connect is not the current non-federated design. Invitation QR display/save is our proposed representation of the same scoped URL, not a claim that both reference products provide that exact flow.
+
+Organization creation leads to its channels and a Share organization action. Channel creation opens the conversation with Share channel. Existing destinations expose the same actions in their details/menu. Sharing uses one sheet with a visible target and scope:
+
+| Scope        | Recipient gets                                                                   |
+| ------------ | -------------------------------------------------------------------------------- |
+| Organization | Organization membership and its ordinary channels, subject to role/history rules |
+| Channel      | Only the selected channel; organization identity for navigation                  |
+
+The sheet offers Copy invitation link, Show QR code and Save QR image. These are representations of the same invitation. A resource URL is not an invitation and cannot grant access. Invitation expiry, revocation and any recipient restrictions are server-owned. Existing email-bound invitations remain email-bound unless a separate scoped share-link capability is deliberately introduced; displaying an invitation ID as a URL must not bypass that rule.
+
+The recipient opens the link/scans → sees service domain, organization/channel and access scope → trusts/selects the instance → signs in to that instance → explicitly accepts → lands in the destination. Never send existing credentials to a server solely because its address appeared in a QR code. QR content never contains administrator, WorkOS or Agent credentials. Unknown/expired/revoked/wrong-account invitations show actionable failure and do not partially join.
+
+## Delivery order
+
+1. Cloud name marks on actual direct-cloud list/title surfaces, with accessible name and assigned device evidence. Desktop gets the same mark only when its origin projection is authoritative.
+2. Existing left sheet lists cloud organizations including channel guests. Actual user A invites B only to channel X; B sees the organization entry and X, cannot fetch sibling Y through UI or CLI. Revoke X and refresh removes that destination when no grants remain.
+3. Owner creates a channel → shares an invitation URL/QR → a second account accepts → both see the same channel. Add equivalent CLI/API and retry/revocation checks. Preserve existing default join-history and local Bot execution boundaries.
+4. Save/share QR natively, deep-link cold launch, long names, duplicate service names, offline states, light/dark and large text; qualify iOS and Android separately.
+
+The current cloud collaboration goal remains active. This UX work does not claim WebSocket, organization-wide Agent membership, arbitrary local work or enterprise authorization to be complete.
diff --git a/docs/research/2026-10-18-cloud-join-ux.md b/docs/research/2026-10-18-cloud-join-ux.md
new file mode 100644
index 0000000000..b7b63e7e28
--- /dev/null
+++ b/docs/research/2026-10-18-cloud-join-ux.md
@@ -0,0 +1,124 @@
+# Cloud join UX: invitation first, service connection when needed
+
+Research date: 2026-10-18. Scope: first-party Slack and Discord documentation, with proposed DeepSeekBot/TOB UX. This is documentation research, not an observation of signed-in production UI or a completed implementation. No shared device was used. Related target: [Cloud navigation and sharing](../architecture/cloud-navigation.md), [#2161](https://github.com/BotHarness/DeepSeekBot/issues/2161).
+
+## Recommendation
+
+Put **Create or join** in the existing channel flow. An invitation should take the recipient to a recognizable organization/channel preview, through any necessary instance sign-in, and into that destination. The service address is relevant context and a trust decision for a new service; it should not force every person through a separate server-administration journey.
+
+Keep three different concepts clear:
+
+- **Cloud service / instance:** official hosting or someone else's self-hosted TOB deployment. It owns its authentication boundary and organizations. Multiple saved instances do not imply federation.
+- **Cloud workspace / organization:** the navigation and membership boundary inside one instance. This is closer to a Slack workspace or Discord server than the TOB instance is.
+- **Channel:** a conversation. A direct channel invitation can grant access without organization membership. Showing its organization identity in navigation does not widen that grant.
+
+These are recommendations based on the Human's confirmed model, not claims about Slack or Discord internals.
+
+## What the official examples establish
+
+| Example                    | Documented behavior                                                                                                                                                                                                                                                                                                             | Apply to TOB                                                                                                                                                                            |
+| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Discord entry              | The server-list `+` offers creation and joining. A recipient can paste an invite or open it directly, review settings, then accept. [Join a Server](https://support.discord.com/hc/en-us/articles/360034842871-How-do-I-join-a-Server)                                                                                          | Put create and join together. Lead with the collaboration destination instead of a remote-service settings form.                                                                        |
+| Discord channel invitation | Invitations can originate beside a channel; that channel becomes the arrival destination. The invitation still joins the server. [Invite friends](https://support.discord.com/hc/en-us/articles/204155938-How-do-I-invite-friends-to-my-server)                                                                                 | Borrow the contextual share action and arrival behavior, **not** the implication that joining a channel grants organization membership.                                                 |
+| Discord share controls     | Invite creation supports copying a link; expiration/use controls and removal are managed by authorized users. [Invites 101](https://support.discord.com/hc/en-us/articles/208866998-Invites-101)                                                                                                                                | Reuse one scoped invitation for URL and QR; let the service enforce its validity.                                                                                                       |
+| Slack workspace invitation | Invited people accept an invitation and establish their workspace account. The documented mobile flow starts from the invitation, not from manually configuring a server. [Join a workspace](https://slack.com/help/articles/212675257-Join-a-Slack-workspace)                                                                  | Preserve the invitation target across authentication and return there. Do not insert a compulsory workspace-creation tutorial before accepting a channel invitation.                    |
+| Slack invitation scope     | Authorized inviters can send workspace invitations or, on relevant plans, invite guests to specified channels. Workspace invite links are shareable. [Invite members](https://slack.com/help/articles/201330256-Invite-new-members-to-your-workspace)                                                                           | Make organization and channel scope visible in the same invitation sheet; do not copy plan restrictions or mobile feature gaps.                                                         |
+| Slack membership vs guest  | Members can browse/join public channels; guests cannot. Single-channel guests access one assigned channel; multi-channel guests access specified channels. [Join a channel](https://slack.com/help/articles/205239967-Join-a-channel), [Guest roles](https://slack.com/help/articles/202518103-Understand-guest-roles-in-Slack) | Org membership and direct channel grants must remain different authorities. A guest sees only granted channels, including on direct API/CLI requests.                                   |
+| Slack Connect              | Acceptance reviews invitation details and channel settings; mobile users select their workspace. It connects collaboration across companies' existing workspaces. [Accept a Connect invitation](https://slack.com/help/articles/360049769934-Accept-a-Slack-Connect-channel-invitation)                                         | Borrow explicit preview and confirmation. Do not require recipients to choose a receiving workspace: TOB's current direct invitation is not Slack Connect or cross-instance federation. |
+| Slack switching            | Mobile Home can swipe right to select a signed-in workspace; desktop uses a workspace icon/list. [Switch workspaces](https://slack.com/help/articles/1500002200741-Switch-between-workspaces)                                                                                                                                   | Reuse the native left sheet for Computers and Cloud workspaces, including guest-only org projections.                                                                                   |
+
+**QR evidence boundary:** Discord documents QR **login** as authorizing another device, with an explicit approval step. That is a different action from accepting a channel invitation. This research did not establish a first-party Slack/Discord invitation-QR-and-save workflow. TOB's invitation QR is therefore a product recommendation: encode the same scoped invitation URL, never an account session or administrator credential. [Discord QR login](https://support.discord.com/hc/en-us/articles/360039213771-QR-Code-Login-FAQ)
+
+The sources establish entry points and steps. Exact current pixels, animation, logged-out-to-app handoff behavior, and every failure state have not been tested in Slack/Discord; the designs below are TOB proposals rather than reproduced screens.
+
+## One coherent entry flow
+
+Use the existing channel-list add action, with an action sheet titled **Create or join** (`创建或加入`):
+
+1. **Create channel** (`创建频道`). Default to the selected destination when the user can create there; otherwise show eligible local/remote destinations. A cloud workspace picker can include **Create workspace** as a secondary action. Creation opens the actual channel, then offers its existing **Invite** action without blocking chat.
+2. **Join with invitation** (`通过邀请加入`). Paste invitation URL or scan QR. An external invitation URL/deep link goes straight to the same preview and skips this input page.
+3. **Connect a cloud service** (`连接云服务`) as a secondary path for people who have only an address and no invitation. Official hosting is a known choice; self-hosting takes an HTTPS address or configuration QR. After instance sign-in, show the user's memberships, direct channel grants, and pending invitations. Do not expose an unrestricted organization directory or imply that knowing the address grants membership.
+
+The native left sheet also exposes this shared entry point. Keep **Add computer** separate because pairing a DSH Host grants a different kind of connection. A pure-cloud user must be able to use these flows without first pairing any computer.
+
+Do not simply rename every existing “server” label. The flow must preserve an invitation destination rather than making people connect, navigate back, discover an organization again, and find the channel manually.
+
+## Recipient preview
+
+The preview is an ordinary join page or sheet, not a configuration dashboard. Example copy for a channel invitation:
+
+```text
+[Organization icon]  Acme Design
+# design-review  [cloud icon]
+
+You are invited to this channel.
+You can see and participate in this channel only.
+
+Cloud service     chat.acme.example
+Joining as        alex@example.test   Change account
+
+[ Join channel ]
+```
+
+For an organization invitation, replace the scope with **Join Acme Design** and a clear explanation of organization membership and the available ordinary channels. Do not reuse the channel-only explanation. Names and logos are presentation supplied by the destination; the visible service domain distinguishes similarly named services.
+
+Before authentication, show only information that the invitation service deliberately permits in its preview. If current email-bound invitations require an authenticated identity before resolving names, show a neutral “Sign in to view your invitation” card with the service domain, then resolve the full target after authentication. Do not add anonymous directory access merely to populate a prettier card. Member counts, participant emails, message snippets, and sibling channel lists are unnecessary for this first slice.
+
+CTA progression:
+
+| State                     | Primary action                  | After success                                                     |
+| ------------------------- | ------------------------------- | ----------------------------------------------------------------- |
+| Unknown service           | Continue to `chat.acme.example` | Trust/config checks and that instance's sign-in; retain target    |
+| Known service, signed out | Sign in to join                 | Return to the same preview with the resolved account              |
+| Correct signed-in account | Join channel / Join workspace   | Persist grant, refresh authorized navigation, open target         |
+| Already joined            | Open channel / Open workspace   | Open existing target without a second grant                       |
+| Wrong recipient account   | Switch account                  | Sign in to this instance with a different identity; retain target |
+
+A first-time service trust decision may be inline on this page, with expanded service details available. Do not silently accept a new authentication issuer or forward a token from a previously connected instance to an arbitrary QR URL. Existing trusted-configuration verification remains real even when its presentation is simpler.
+
+## Navigation after joining
+
+- One left sheet: **Computers**, then **Cloud workspaces**. Cloud selection filters conversations independently of the current computer.
+- A channel guest sees the organization icon/name, a discreet **Guest** label, and only the authorized channel(s). No empty sibling rows, organization member directory, or organization management entry.
+- If full membership and direct grants both exist, show one org destination. Losing membership recomputes access from remaining grants; it does not delete still-authorized guest channels or retain org privileges.
+- Identify destinations with instance identity plus organization identity; show the service domain for collisions/details. Do not merge identical names from different deployments.
+- Channel list and conversation header place the cloud mark immediately after the displayed name, consistently with the current first slice.
+
+## Sender share sheet
+
+Creation and later sharing open the same contextual **Invite** sheet:
+
+- Organization: **Invite to Acme Design**; channel: **Invite to #design-review**.
+- State the resulting scope in one line. A channel invite does not upgrade the recipient to org membership.
+- Offer **Copy invitation link**, **Show QR**, **Save QR**, and native **Share** where supported. The QR and link represent the same invitation and validity.
+- For the existing email-bound invitation model, collect/retain the intended recipient and label the restriction. Forwarding a link does not make it an open enrollment link.
+- A generic reusable link for anyone holding it would be a new server-owned invitation capability with its own expiry/revocation/use semantics. Do not simulate one by encoding a resource ID or removing the email check in the client.
+- Existing-member deep links can simply open authorized resources. Label them as links, not invitations, and offer a real scoped invitation when access must be granted.
+
+## Cold launch and recovery
+
+The following are proposed acceptance behaviors, not claims that existing code already provides them:
+
+| Event                                | Required behavior                                                                                                                                                               |
+| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Cold app, no Host                    | Route directly to pending join intent; do not redirect to computer pairing.                                                                                                     |
+| External QR vs pasted URL            | Both resolve to the same preview, permissions, and acceptance operation.                                                                                                        |
+| Browser authentication return        | Bind continuation to the selected instance and original invite; validate auth state/PKCE; resolve fresh invitation state before accepting. No arbitrary return URL.             |
+| App interrupted while authenticating | Resume a local pending intent or allow reopening the link. If the auth transaction expired, start a new transaction; never silently switch target.                              |
+| Network loss after acceptance        | Reconcile current membership/grant with the server. Retrying must not duplicate membership or create another workspace.                                                         |
+| Expired/revoked invite               | Explain that the invitation is unavailable and offer opening another link/contacting the inviter. Do not auto-create an org or silently broaden scope.                          |
+| Wrong account                        | Show the account mismatch without exposing another recipient's private identity; allow switching this instance's account while preserving other instance sessions.              |
+| Service unavailable                  | Keep target/address and offer Retry; existing local computer navigation still works.                                                                                            |
+| Service configuration changes        | Re-run trusted-configuration validation; require renewed confirmation where the existing trust contract requires it. Do not convert an invite into authority to change issuers. |
+| Grant revoked while viewing          | Close or disable unauthorized content, refresh navigation, remove an org destination only when no membership/grants remain.                                                     |
+| Scanner permission denied            | Keep paste-link/manual-address path available.                                                                                                                                  |
+
+Pending invitation links may themselves confer limited authority; do not publish their raw tokens in logs, screenshots, analytics, or PR evidence. An image saved by the inviter contains the same invitation authority as the copied link, not a safer version of it.
+
+## Suggested next tracer bullet
+
+**A creates channel → invites B to that channel → B opens a link or scans QR on a phone with no paired computer → sees target/scope/service → signs in if necessary → confirms → lands in the channel; the left sheet shows its organization as Guest; sibling channel access fails through UI and CLI.**
+
+First extend the existing recipient-bound invitation rather than simultaneously introducing public reusable links, org discovery, federation, or Slack Connect semantics. Keep the channel destination across auth and use the current server grant authority. Add a minimal authorized organization name/icon projection for guest navigation without granting org-directory access.
+
+Required evidence: existing-instance and new-instance paths; cold launch; wrong-account recovery; duplicate acceptance/retry; sibling denial; revocation; screenshots of actual preview and post-join sheet; CLI parity. Native QR-save/export and both mobile platforms need their own runtime evidence; a successful URL parser or rendered mock does not qualify those behaviors.