diff --git a/apps/web/src/features/workbench/ChannelContent.svelte b/apps/web/src/features/workbench/ChannelContent.svelte
new file mode 100644
index 0000000..9e81962
--- /dev/null
+++ b/apps/web/src/features/workbench/ChannelContent.svelte
@@ -0,0 +1,30 @@
+<script lang="ts">
+  import type { InspectorItem, ProjectWorkspace, WorkbenchChannel } from './types';
+  import OverviewChannel from './channels/OverviewChannel.svelte';
+  import InboxChannel from './channels/InboxChannel.svelte';
+  import TasksChannel from './channels/TasksChannel.svelte';
+  import AISessionsChannel from './channels/AISessionsChannel.svelte';
+  import NotesSourcesChannel from './channels/NotesSourcesChannel.svelte';
+  import CronChannel from './channels/CronChannel.svelte';
+  import CustomLinkChannel from './channels/CustomLinkChannel.svelte';
+
+  export let workspace: ProjectWorkspace;
+  export let channel: WorkbenchChannel;
+  export let onInspect: (item: InspectorItem) => void;
+</script>
+
+{#if channel.type === 'overview'}
+  <OverviewChannel {workspace} {onInspect} />
+{:else if channel.type === 'inbox'}
+  <InboxChannel messages={workspace.inbox} {onInspect} />
+{:else if channel.type === 'tasks'}
+  <TasksChannel tasks={workspace.tasks} {onInspect} />
+{:else if channel.type === 'ai_sessions'}
+  <AISessionsChannel sessions={workspace.aiSessions} {onInspect} />
+{:else if channel.type === 'notes_sources'}
+  <NotesSourcesChannel items={workspace.notesSources} {onInspect} />
+{:else if channel.type === 'cron'}
+  <CronChannel plans={workspace.cronPlans} {onInspect} />
+{:else}
+  <CustomLinkChannel {channel} />
+{/if}
diff --git a/apps/web/src/features/workbench/ChannelContent.test.ts b/apps/web/src/features/workbench/ChannelContent.test.ts
new file mode 100644
index 0000000..41c4368
--- /dev/null
+++ b/apps/web/src/features/workbench/ChannelContent.test.ts
@@ -0,0 +1,39 @@
+import '@testing-library/jest-dom/vitest';
+import { fireEvent, render, screen } from '@testing-library/svelte';
+import { describe, expect, it } from 'vitest';
+import ChannelContent from './ChannelContent.svelte';
+import { getProjectWorkspace } from './mockData';
+
+describe('ChannelContent', () => {
+  const workspace = getProjectWorkspace(1);
+
+  it('renders different templates for system and custom channels', () => {
+    for (const type of ['overview', 'inbox', 'tasks', 'ai_sessions', 'notes_sources', 'cron', 'custom_link'] as const) {
+      const channel = workspace.channels.find((item) => item.type === type);
+      if (!channel) throw new Error(`missing ${type}`);
+
+      render(ChannelContent, { props: { workspace, channel, onInspect: () => {} } });
+    }
+
+    expect(screen.getByText('Open external channel')).toBeInTheDocument();
+  });
+
+  it('sends selected task details to inspector', async () => {
+    let inspectedTitle = '';
+    const channel = workspace.channels.find((item) => item.type === 'tasks');
+    if (!channel) throw new Error('missing task channel');
+
+    render(ChannelContent, {
+      props: {
+        workspace,
+        channel,
+        onInspect: (item) => {
+          inspectedTitle = item.title;
+        },
+      },
+    });
+
+    await fireEvent.click(screen.getByRole('button', { name: 'Inspect Confirm homepage information architecture' }));
+    expect(inspectedTitle).toBe('Confirm homepage information architecture');
+  });
+});
diff --git a/apps/web/src/features/workbench/ObjectInspector.svelte b/apps/web/src/features/workbench/ObjectInspector.svelte
new file mode 100644
index 0000000..f36f387
--- /dev/null
+++ b/apps/web/src/features/workbench/ObjectInspector.svelte
@@ -0,0 +1,37 @@
+<script lang="ts">
+  import type { InspectorItem } from './types';
+
+  export let item: InspectorItem | null;
+  let activeTab: 'discussion' | 'properties' | 'more' = 'discussion';
+</script>
+
+<aside class="object-inspector" aria-label="Object inspector">
+  <div class="inspector-tabs" role="tablist" aria-label="Inspector tabs">
+    <button role="tab" aria-selected={activeTab === 'discussion'} on:click={() => (activeTab = 'discussion')}>Discussion</button>
+    <button role="tab" aria-selected={activeTab === 'properties'} on:click={() => (activeTab = 'properties')}>Properties</button>
+    <button role="tab" aria-selected={activeTab === 'more'} on:click={() => (activeTab = 'more')}>More</button>
+  </div>
+
+  {#if item}
+    <h2>{item.title}</h2>
+    <p>{item.description}</p>
+    {#if activeTab === 'discussion'}
+      <p>No comments yet. Add project discussion here later.</p>
+    {:else if activeTab === 'properties'}
+      <dl>
+        {#each item.properties as property}
+          <div>
+            <dt>{property.label}</dt>
+            <dd>{property.value}</dd>
+          </div>
+        {/each}
+      </dl>
+    {:else}
+      <button type="button">Copy link</button>
+      <button type="button">Archive</button>
+    {/if}
+  {:else}
+    <h2>Inspector</h2>
+    <p>Select an item to inspect discussion, properties, and actions.</p>
+  {/if}
+</aside>
diff --git a/apps/web/src/features/workbench/ProjectWorkbench.svelte b/apps/web/src/features/workbench/ProjectWorkbench.svelte
index 4ab9ffd..3d29c30 100644
--- a/apps/web/src/features/workbench/ProjectWorkbench.svelte
+++ b/apps/web/src/features/workbench/ProjectWorkbench.svelte
@@ -1,14 +1,19 @@
 <script lang="ts">
   import { getProjectWorkspace, workbenchProjects } from './mockData';
+  import ChannelContent from './ChannelContent.svelte';
+  import ObjectInspector from './ObjectInspector.svelte';
   import ProjectRail from './ProjectRail.svelte';
   import ProjectChannelSidebar from './ProjectChannelSidebar.svelte';
   import WorkspaceTopbar from './WorkspaceTopbar.svelte';
+  import type { InspectorItem } from './types';
 
   export let currentUser: { account: string };
 
   let selectedProjectID = workbenchProjects[0].id;
+  let selectedItem: InspectorItem | null = null;
   $: workspace = getProjectWorkspace(selectedProjectID);
   $: selectedChannelID = workspace.channels[0].id;
+  $: selectedChannel = workspace.channels.find((channel) => channel.id === selectedChannelID) ?? workspace.channels[0];
 
   function selectProject(projectID: number) {
     selectedProjectID = projectID;
@@ -17,6 +22,10 @@
   function selectChannel(channelID: string) {
     selectedChannelID = channelID;
   }
+
+  function inspectItem(item: InspectorItem) {
+    selectedItem = item;
+  }
 </script>
 
 <main class="workbench-shell">
@@ -32,10 +41,8 @@
       onSelectChannel={selectChannel}
     />
     <section class="channel-stage" aria-label="Channel content">
-      <h1>{workspace.channels.find((channel) => channel.id === selectedChannelID)?.title}</h1>
+      <ChannelContent {workspace} channel={selectedChannel} onInspect={inspectItem} />
     </section>
-    <aside class="object-inspector" aria-label="Object inspector">
-      <p>Select an item to inspect discussion, properties, and actions.</p>
-    </aside>
+    <ObjectInspector item={selectedItem} />
   </div>
 </main>
diff --git a/apps/web/src/features/workbench/channels/AISessionsChannel.svelte b/apps/web/src/features/workbench/channels/AISessionsChannel.svelte
new file mode 100644
index 0000000..3b52383
--- /dev/null
+++ b/apps/web/src/features/workbench/channels/AISessionsChannel.svelte
@@ -0,0 +1,27 @@
+<script lang="ts">
+  import type { AISessionItem, InspectorItem } from '../types';
+
+  export let sessions: AISessionItem[];
+  export let onInspect: (item: InspectorItem) => void;
+  let selectedSessionID = sessions[0]?.id;
+
+  $: selectedSession = sessions.find((session) => session.id === selectedSessionID) ?? sessions[0];
+
+  function inspectSession(session: AISessionItem) {
+    onInspect({ title: session.title, type: 'AI session', description: session.summary, properties: [{ label: 'Updated', value: session.updatedAt }, { label: 'References', value: session.references.join(', ') }] });
+  }
+</script>
+
+<section class="channel-page ai-sessions-channel">
+  <header class="channel-header"><p>Project intelligence</p><h1>AI Sessions</h1></header>
+  <div class="session-layout">
+    <div class="session-list">
+      {#each sessions as session}
+        <button class:active={selectedSession?.id === session.id} on:click={() => (selectedSessionID = session.id)}>{session.title}<small>{session.updatedAt}</small></button>
+      {/each}
+    </div>
+    {#if selectedSession}
+      <article class="conversation-summary"><h2>{selectedSession.title}</h2><p>{selectedSession.summary}</p><p>References: {selectedSession.references.join(', ')}</p><button aria-label={`Inspect ${selectedSession.title}`} on:click={() => inspectSession(selectedSession)}>Inspect</button></article>
+    {/if}
+  </div>
+</section>
diff --git a/apps/web/src/features/workbench/channels/CronChannel.svelte b/apps/web/src/features/workbench/channels/CronChannel.svelte
new file mode 100644
index 0000000..7a6f2c3
--- /dev/null
+++ b/apps/web/src/features/workbench/channels/CronChannel.svelte
@@ -0,0 +1,19 @@
+<script lang="ts">
+  import type { CronPlan, InspectorItem } from '../types';
+
+  export let plans: CronPlan[];
+  export let onInspect: (item: InspectorItem) => void;
+
+  function inspectPlan(plan: CronPlan) {
+    onInspect({ title: plan.title, type: 'Cron plan', description: `Scheduled by ${plan.owner}.`, properties: [{ label: 'State', value: plan.enabled ? 'Enabled' : 'Disabled' }, { label: 'Schedule', value: plan.schedule }, { label: 'Next run', value: plan.nextRun }, { label: 'Last result', value: plan.lastResult }] });
+  }
+</script>
+
+<section class="channel-page cron-channel">
+  <header class="channel-header"><p>Scheduled work</p><h1>Cron Plans</h1></header>
+  <div class="cron-list">
+    {#each plans as plan}
+      <article class="cron-row"><div><h2>{plan.title}</h2><p>{plan.schedule} · {plan.nextRun}</p><small>{plan.enabled ? 'Enabled' : 'Disabled'} · {plan.lastResult}</small></div><button aria-label={`Inspect ${plan.title}`} on:click={() => inspectPlan(plan)}>Inspect</button></article>
+    {/each}
+  </div>
+</section>
diff --git a/apps/web/src/features/workbench/channels/CustomLinkChannel.svelte b/apps/web/src/features/workbench/channels/CustomLinkChannel.svelte
new file mode 100644
index 0000000..0fa9111
--- /dev/null
+++ b/apps/web/src/features/workbench/channels/CustomLinkChannel.svelte
@@ -0,0 +1,16 @@
+<script lang="ts">
+  import type { WorkbenchChannel } from '../types';
+
+  export let channel: WorkbenchChannel;
+
+  function copyUrl() {
+    void navigator.clipboard?.writeText(channel.url ?? '');
+  }
+</script>
+
+<section class="channel-page custom-link-channel">
+  <header class="channel-header"><p>External resource</p><h1>{channel.title}</h1></header>
+  <p>{channel.url}</p>
+  <a href={channel.url} target="_blank" rel="noreferrer">Open external channel</a>
+  <button type="button" on:click={copyUrl}>Copy URL</button>
+</section>
diff --git a/apps/web/src/features/workbench/channels/InboxChannel.svelte b/apps/web/src/features/workbench/channels/InboxChannel.svelte
new file mode 100644
index 0000000..2d25d63
--- /dev/null
+++ b/apps/web/src/features/workbench/channels/InboxChannel.svelte
@@ -0,0 +1,22 @@
+<script lang="ts">
+  import type { InboxMessage, InspectorItem } from '../types';
+
+  export let messages: InboxMessage[];
+  export let onInspect: (item: InspectorItem) => void;
+
+  function inspectMessage(message: InboxMessage) {
+    onInspect({ title: message.title, type: 'Inbox message', description: message.summary, properties: [{ label: 'Source', value: message.source }, { label: 'Status', value: message.status }, { label: 'Tag', value: message.tag }, { label: 'Time', value: message.time }] });
+  }
+</script>
+
+<section class="channel-page inbox-channel">
+  <header class="channel-header"><p>Message Flow</p><h1>Inbox</h1></header>
+  <div class="message-list">
+    {#each messages as message}
+      <article class="message-row">
+        <div><small>{message.source} · {message.time}</small><h2>{message.title}</h2><p>{message.summary}</p><span>{message.status} · #{message.tag}</span></div>
+        <button aria-label={`Inspect ${message.title}`} on:click={() => inspectMessage(message)}>Inspect</button>
+      </article>
+    {/each}
+  </div>
+</section>
diff --git a/apps/web/src/features/workbench/channels/NotesSourcesChannel.svelte b/apps/web/src/features/workbench/channels/NotesSourcesChannel.svelte
new file mode 100644
index 0000000..256ef8b
--- /dev/null
+++ b/apps/web/src/features/workbench/channels/NotesSourcesChannel.svelte
@@ -0,0 +1,19 @@
+<script lang="ts">
+  import type { InspectorItem, NoteSourceItem } from '../types';
+
+  export let items: NoteSourceItem[];
+  export let onInspect: (item: InspectorItem) => void;
+
+  function inspectItem(item: NoteSourceItem) {
+    onInspect({ title: item.title, type: item.kind, description: `${item.source} record in this project.`, properties: [{ label: 'Updated', value: item.updatedAt }, { label: 'Tag', value: item.tag }, { label: 'Source', value: item.source }] });
+  }
+</script>
+
+<section class="channel-page notes-sources-channel">
+  <header class="channel-header"><p>Project reference</p><h1>Notes & Sources</h1></header>
+  <div class="file-list">
+    {#each items as item}
+      <article class="file-row"><span>{item.kind}</span><div><h2>{item.title}</h2><small>{item.source} · {item.updatedAt} · #{item.tag}</small></div><button aria-label={`Inspect ${item.title}`} on:click={() => inspectItem(item)}>Inspect</button></article>
+    {/each}
+  </div>
+</section>
diff --git a/apps/web/src/features/workbench/channels/OverviewChannel.svelte b/apps/web/src/features/workbench/channels/OverviewChannel.svelte
new file mode 100644
index 0000000..6d478cf
--- /dev/null
+++ b/apps/web/src/features/workbench/channels/OverviewChannel.svelte
@@ -0,0 +1,29 @@
+<script lang="ts">
+  import type { InspectorItem, ProjectWorkspace } from '../types';
+
+  export let workspace: ProjectWorkspace;
+  export let onInspect: (item: InspectorItem) => void;
+
+  const metrics = (workspace: ProjectWorkspace) => [
+    { label: 'Inbox', value: workspace.inbox.length, description: 'Messages waiting for review' },
+    { label: 'Tasks', value: workspace.tasks.length, description: 'Work plan records' },
+    { label: 'AI Sessions', value: workspace.aiSessions.length, description: 'Saved conversations' },
+    { label: 'Notes & Sources', value: workspace.notesSources.length, description: 'Project reference records' },
+    { label: 'Cron Plans', value: workspace.cronPlans.length, description: 'Scheduled task records' },
+  ];
+</script>
+
+<section class="channel-page overview-channel">
+  <header class="channel-header">
+    <p>{workspace.project.name}</p>
+    <h1>Overview</h1>
+  </header>
+  <div class="metric-list">
+    {#each metrics(workspace) as metric}
+      <button class="metric-card" on:click={() => onInspect({ title: metric.label, type: 'Workspace metric', description: metric.description, properties: [{ label: 'Records', value: String(metric.value) }] })}>
+        <strong>{metric.value}</strong>
+        <span>{metric.label}</span>
+      </button>
+    {/each}
+  </div>
+</section>
diff --git a/apps/web/src/features/workbench/channels/TasksChannel.svelte b/apps/web/src/features/workbench/channels/TasksChannel.svelte
new file mode 100644
index 0000000..b59e47e
--- /dev/null
+++ b/apps/web/src/features/workbench/channels/TasksChannel.svelte
@@ -0,0 +1,23 @@
+<script lang="ts">
+  import type { InspectorItem, WorkTask } from '../types';
+
+  export let tasks: WorkTask[];
+  export let onInspect: (item: InspectorItem) => void;
+
+  function inspectTask(task: WorkTask) {
+    onInspect({ title: task.title, type: 'Task', description: task.summary, properties: [{ label: 'Status', value: task.completed ? 'Completed' : 'Open' }, { label: 'Owner', value: task.owner }, { label: 'Due', value: task.due }, { label: 'Tag', value: task.tag }] });
+  }
+</script>
+
+<section class="channel-page tasks-channel">
+  <header class="channel-header"><p>Work Plan</p><h1>Tasks</h1></header>
+  <div class="task-list">
+    {#each tasks as task}
+      <article class:completed={task.completed} class="task-card">
+        <span class="task-check" aria-hidden="true">{task.completed ? 'Done' : 'Open'}</span>
+        <div><h2>{task.title}</h2><p>{task.summary}</p><small>{task.owner} · {task.due} · #{task.tag}</small></div>
+        <button aria-label={`Inspect ${task.title}`} on:click={() => inspectTask(task)}>Inspect</button>
+      </article>
+    {/each}
+  </div>
+</section>