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title CopilotSidebar
icon lucide/PanelRight
description Drop-in collapsible sidebar chat that wraps your main content.
snippet_cell prebuilt-sidebar

What is this?

<CopilotSidebar> is a prebuilt chat surface that docks to the side of your app. It wraps your main content so the chat can slide out on demand, making it a good fit for in-app copilots that need to stay accessible without taking over the entire viewport.

When should I use this?

Use the sidebar when you want:

  • A persistent, collapsible chat attached to your app shell
  • Chat to live alongside your main content rather than on top of it
  • A launcher the user can toggle without losing their place

For a floating bubble that overlays content, see CopilotPopup. For a fully embedded chat pane, use <CopilotChat> directly.

Basic setup

Wrap your app in <CopilotKit> once (it wires the runtime, session, and agent registry) and drop <CopilotSidebar> alongside your main content. The sidebar renders as a sibling so it can slide out without reflowing your page:

Configuring the sidebar

<CopilotSidebar> accepts the same props as <CopilotChat> plus a few of its own. The example below opens the sidebar by default and targets a named agent:

Common sidebar-specific props:

Prop Description
defaultOpen Whether the sidebar starts open on first render.
agentId Agent slug the sidebar should talk to (must match an agent configured on the runtime).
labels User-facing copy for the header, placeholder, and disclaimer.
header Slot for the sidebar header bar — see the slot system.
toggleButton Slot for the open/close launcher button.

Styling

CopilotSidebar participates in the slot system, so every piece of its UI is customizable, from Tailwind classes on the message view to a full component swap for the header or toggle button. See custom look and feel for the full slot reference.