Sources

Displays the links the agent used for a reply.

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"use client"

import { useChat } from "@ai-sdk/react"

Sources is a line that lists the links the agent used for a reply. It says how many there are, like "Used 3 sources", and opens into a link for each one.

Sources is built with Trace with a TraceCollapsible for the list.

Installation

Sources is built with the Trace component.


pnpm dlx shadcn@latest add trace

Usage

import {
  Trace,
  TraceCollapsible,
  TraceCollapsibleContent,
  TraceCollapsibleTrigger,
  TraceIcon,
  TraceLine,
  TraceTitle,
} from "@/components/ui/trace"

<Trace>
  <TraceCollapsible>
    <TraceCollapsibleTrigger>
      <TraceLine>
        <TraceIcon>
          <GlobeIcon />
        </TraceIcon>
        <TraceTitle>Used {sources.length} sources</TraceTitle>
      </TraceLine>
    </TraceCollapsibleTrigger>
    <TraceCollapsibleContent>
      <Trace>
        {sources.map((source) => (
          <a
            key={source.url}
            href={source.url}
            target="_blank"
            rel="noreferrer"
          >
            <TraceLine>
              <TraceIcon>
                <GlobeIcon />
              </TraceIcon>
              <TraceTitle>
                {source.title ?? new URL(source.url).hostname}
                <span className="sr-only"> (opens in a new tab)</span>
              </TraceTitle>
              <TraceIcon>
                <ArrowUpRightIcon />
              </TraceIcon>
            </TraceLine>
          </a>
        ))}
      </Trace>
    </TraceCollapsibleContent>
  </TraceCollapsible>
</Trace>

AI SDK

Collect the source-url parts of a message and render them after the text. The agent can cite the same page more than once, so dedupe them by url.

const sources = message.parts
  .filter((part) => part.type === "source-url")
  .filter(
    (part, index, all) =>
      all.findIndex((other) => other.url === part.url) === index
  )

title is optional on a source-url part. Fall back to the hostname of the URL.

Accessibility

Each source is a plain link inside the list.

Links open in a new tab. Add sr-only text, like "(opens in a new tab)", so screen readers announce it.
The arrow icon is decorative. The title is the name of the link.
The count in the trigger, like "Used 3 sources", tells the person what opens before they open it.

Migrating from AI SDK Elements

If you added Sources from AI SDK Elements, your project has a components/ai-elements/sources.tsx wrapper. Paste this prompt into your coding agent to rebuild it on Trace. Every export keeps its name and props, so the code that uses it keeps working.

Prompt

Migrate components/ai-elements/sources.tsx from AI SDK Elements to the shadcn/ui Trace component.
 
Keep every export, with the same name and props, so the code that imports it keeps working. Only change how each part renders.
 
1. Install Trace: npx shadcn@latest add trace
2. Read https://ui.shadcn.com/docs/ai-elements/base/sources.md and build Sources the same way.
3. Rebuild each part:
   - Sources renders a Trace with a TraceCollapsible.
   - SourcesTrigger renders a TraceCollapsibleTrigger with a TraceLine, a TraceIcon and a TraceTitle that uses count, like "Used 3 sources".
   - SourcesContent renders a TraceCollapsibleContent with a Trace for the links.
   - Source renders a link that wraps a TraceLine, with a TraceIcon and a TraceTitle for its title. Add "(opens in a new tab)" in an sr-only span.
4. Remove the imports the file no longer uses.
5. Run the type checker and fix any errors.