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SlackLinkExpandingBot

Slackbot Link Expanding is a bot operated by Slack that fetches metadata from shared links to create rich previews.
UnverifiableSlackSlackLinkExpandingBot
Preview

What is SlackLinkExpandingBot?

SlackLinkExpandingBot makes the preview that can appear below a website link in a Slack message. When a member posts a URL, Slack requests the page and reads its embedded preview data. This is a fetch prompted by a shared link, not a crawler discovering pages for a site-wide index.

Slack may decline to expand a link when the page has no usable preview data or requires authentication. A workspace administrator can also block previews from a website, and individual members can hide them. A missing card therefore does not prove that the bot failed to reach the URL.

This bot has no documented search-index or AI role. Allowing it can change how a link is presented inside Slack, but a request does not make the page eligible for an AI citation. Slack also does not identify this fetcher as a source of model-training data.

The record provides the stable token SlackLinkExpandingBot and says the bot respects robots.txt. It also marks verification as unverifiable, and Slack's public preview guidance does not give a bot-specific robots commitment. A matching header is useful for policy and log analysis, but it does not authenticate the sender.

Indirectly relevant

Is SlackLinkExpandingBot relevant for AI search?

Indirectly. SlackLinkExpandingBot has no AI product of its own, but its output can end up in the systems that AI answers draw on.

SlackLinkExpandingBot fetches pages to build link-preview cards. It does not feed an AI index, but it reads the same Open Graph and structured metadata that AI systems parse to understand your pages, so clean preview metadata doubles as AI-friendly metadata.

How to handle SlackLinkExpandingBot

Leave public pages reachable if you want Slack to create previews when people share them. Keep private material such as drafts or account pages behind authentication rather than relying on the absence of a preview.

To ask this crawler not to fetch any page, use its stable token:

User-agent: SlackLinkExpandingBot
Disallow: /

This catalog records robots.txt support, but Slack does not publish a specific compliance promise in its link-preview guidance. Check access logs after a change, and enforce any mandatory restriction at the application or edge.

Examples

  • A developer pastes a public release-note URL into a channel, and SlackLinkExpandingBot requests that page to assemble the message preview.
  • A workspace administrator blocks previews from a sensitive domain, so links from that domain remain plain even though members can still open them.
  • A security team sees the token on a private route and investigates instead of trusting it, because the user-agent string can be copied.

Frequently asked questions about SlackLinkExpandingBot

Learn about AI visibility monitoring and how Promptwatch helps your brand succeed in AI search.

A Slack member sharing a URL can trigger the request. Slack uses the fetched page data to build a preview below the message.

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