diff --git a/components/layout/__tests__/sidebar-plugin-section.test.tsx b/components/layout/__tests__/sidebar-plugin-section.test.tsx
index d17904faf..0ca14bed3 100644
--- a/components/layout/__tests__/sidebar-plugin-section.test.tsx
+++ b/components/layout/__tests__/sidebar-plugin-section.test.tsx
@@ -31,7 +31,7 @@ const mailboxes: Mailbox[] = [
   { id: 'inbox', name: 'Inbox', role: 'inbox', parentId: null, totalEmails: 0, unreadEmails: 0, myRights: { mayAddItems: true } },
 ] as unknown as Mailbox[];
 
-function offer(id: string, name: string, slot: string) {
+function offer(id: string, name: string, slot: string, extraSlots: string[] = []) {
   const plugin: InstalledPlugin = {
     id, name, version: '1.0.0', author: '', description: '', type: 'ui-extension',
     permissions: ['ui:sidebar-widget'], grantedPermissions: ['ui:sidebar-widget'], entrypoint: 'index.js',
@@ -42,7 +42,7 @@ function offer(id: string, name: string, slot: string) {
     code: '',
     tier: 'untrusted',
     background: { evaluateShouldShow: vi.fn(async () => true) } as never,
-    slotOffers: [{ name: slot as never, order: 100, hasShouldShow: false }],
+    slotOffers: [{ name: slot as never, order: 100, hasShouldShow: false }, ...extraSlots.map((name) => ({ name: name as never, order: 100, hasShouldShow: false }))],
     hookDisposables: [],
   });
 }
@@ -84,6 +84,24 @@ describe('Sidebar plugin sections', () => {
     expect(opts.extraProps).toEqual({ mailboxId: 'inbox' });
   });
 
+  it('places inline plugin actions next to the collapsible heading, never inside its button', async () => {
+    offer('cal', 'Agenda', 'sidebar-section', ['sidebar-section-actions']);
+    const { container } = render(<Sidebar mailboxes={mailboxes} selectedMailbox="inbox" />);
+    await waitFor(() => expect(createSlotInstance).toHaveBeenCalledTimes(2));
+
+    const section = container.querySelector('[data-plugin-sidebar-section="cal"]')!;
+    const header = screen.getByRole('button', { name: 'Agenda' });
+    const actions = section.querySelector('[data-plugin-sidebar-actions="cal"]')!;
+    expect(actions).toBeInTheDocument();
+    expect(header.contains(actions)).toBe(false);
+    expect(header.parentElement).toBe(actions.parentElement);
+    expect(section.querySelector('[data-plugin-iframe-slot="cal:sidebar-section-actions"]')).toBeInTheDocument();
+
+    fireEvent.click(header);
+    expect(header).toHaveAttribute('aria-expanded', 'false');
+    expect(section.querySelector('[data-plugin-sidebar-actions="cal"]')).toBeNull();
+  });
+
   it('folds a section and remembers it per plugin', async () => {
     offer('cal', 'Agenda', 'sidebar-section');
     const first = render(<Sidebar mailboxes={mailboxes} selectedMailbox="inbox" />);
diff --git a/components/plugins/plugin-sidebar-sections.tsx b/components/plugins/plugin-sidebar-sections.tsx
index f52f3bff9..bb77c2287 100644
--- a/components/plugins/plugin-sidebar-sections.tsx
+++ b/components/plugins/plugin-sidebar-sections.tsx
@@ -30,6 +30,7 @@ function PluginSidebarSection({ pluginId, extraProps }: { pluginId: string; extr
   const bodyId = useId();
   const title = useSyncExternalStore(subscribeSectionTitles, () => sectionTitle(pluginId), () => undefined);
   const name = title || getActivePlugin(pluginId)?.plugin.name || pluginId;
+  const hasActions = !!getActivePlugin(pluginId)?.slotOffers.some((o) => o.name === 'sidebar-section-actions');
 
   const toggle = () => {
     setCollapsed((prev) => {
@@ -40,21 +41,29 @@ function PluginSidebarSection({ pluginId, extraProps }: { pluginId: string; extr
 
   return (
     <div data-plugin-sidebar-section={pluginId}>
-      {/* Same look as the sidebar's own section headers (Folders, Tags). */}
-      <button
-        type="button"
-        onClick={toggle}
-        aria-expanded={!collapsed}
-        aria-controls={bodyId}
-        className="group w-full flex items-center pb-1 pt-5 px-3 select-none rounded-sm hover:bg-muted/40 transition-colors"
-      >
-        {collapsed ? (
-          <ChevronRight className="w-3.5 h-3.5 text-muted-foreground flex-shrink-0 rtl:-scale-x-100" />
-        ) : (
-          <ChevronDown className="w-3.5 h-3.5 text-muted-foreground flex-shrink-0" />
+      {/* A separate action slot keeps buttons aligned with the host-owned
+          heading. Never put interactive controls inside the collapse button. */}
+      <div className="flex w-full items-end pb-1 pt-5 px-3 min-w-0">
+        <button
+          type="button"
+          onClick={toggle}
+          aria-expanded={!collapsed}
+          aria-controls={bodyId}
+          className="group flex flex-1 min-w-0 items-center select-none rounded-sm hover:bg-muted/40 transition-colors"
+        >
+          {collapsed ? (
+            <ChevronRight className="w-3.5 h-3.5 text-muted-foreground flex-shrink-0 rtl:-scale-x-100" />
+          ) : (
+            <ChevronDown className="w-3.5 h-3.5 text-muted-foreground flex-shrink-0" />
+          )}
+          <span className="ms-1.5 text-sm font-semibold text-foreground truncate">{name}</span>
+        </button>
+        {hasActions && !collapsed && (
+          <div data-plugin-sidebar-actions={pluginId} className="ms-auto shrink-0 ps-1 flex items-center">
+            <PluginIframeSlot pluginId={pluginId} slot="sidebar-section-actions" />
+          </div>
         )}
-        <span className="ms-1.5 text-sm font-semibold text-foreground truncate">{name}</span>
-      </button>
+      </div>
       {/* A collapsed section has no iframe at all, so it costs nothing. */}
       <div id={bodyId} hidden={collapsed}>
         {!collapsed && <PluginIframeSlot pluginId={pluginId} slot="sidebar-section" extraProps={extraProps} />}
diff --git a/lib/plugin-slot-catalog.ts b/lib/plugin-slot-catalog.ts
index daf10c626..977ff2b91 100644
--- a/lib/plugin-slot-catalog.ts
+++ b/lib/plugin-slot-catalog.ts
@@ -51,6 +51,7 @@ export const SLOT_CATALOG = {
   'navigation-rail-bottom': S('navigation', 'frame', ['ui:navigation-rail'], {}, 'the bottom of the navigation rail'),
   'sidebar-widget': S('navigation', 'frame', ['ui:sidebar-widget'], {}, 'a widget at the bottom of the mail sidebar'),
   'sidebar-section': S('navigation', 'frame', ['ui:sidebar-widget'], { mailboxId: null }, 'a collapsible section in the mail sidebar, below the folders'),
+  'sidebar-section-actions': S('navigation', 'frame', ['ui:sidebar-widget'], {}, 'compact controls beside a collapsible plugin sidebar-section heading', true),
   'top-bar-actions': S('navigation', 'action', ['ui:toolbar'], {}, 'buttons in the top bar, next to search', true),
   'app-page': S('navigation', 'frame', ['ui:app-page'], { pageId: null, path: null }, 'a full page of its own, with an entry in the navigation rail (api.ui.setPages)'),