Safe Official docs Social Bots

Slack Link Expander

Operated by Slack

Quick Facts

User-Agent:
Slackbot-LinkExpanding
Category:
Social Bots
Operator:
Slack
Safety:
Safe
Blocking Impact:
Low - No SEO ranking impact
SEO Impact Score:
2/10
Official docs:
api.slack.com

Confirmed by the operator

Slack names Slackbot-LinkExpanding on its own documentation page, linked above. The token, purpose and robots.txt behaviour on this profile come from that page, re-checked on September 22, 2026.

What is Slack Link Expander?

Slack Link Expander is an AI crawler operated by Slack. It uses the user-agent string Slackbot-LinkExpanding and follows the Robots Exclusion Protocol.

Slack Link Expander is an AI crawler operated by Slack. It uses the user-agent string Slackbot-LinkExpanding and follows the Robots Exclusion Protocol.
Slack Link Expander uses the user-agent token Slackbot-LinkExpanding. You can control it via robots.txt, meta tags (noai), or the emerging llms.txt standard. Robots.txt is voluntary; for hard enforcement, combine it with server-level IP blocking.

What happens if you block Slack Link Expander?

🔶 AI Visibility Trade-off - Blocking Slack Link Expander will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
Generally safe to allow; provides legitimate crawling value.

How to block Slack Link Expander with robots.txt

<code>User-agent: Slackbot-LinkExpanding</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)
User-agent: Slackbot-LinkExpanding Disallow: /
Allow all (robots.txt)
User-agent: Slackbot-LinkExpanding Allow: /
Block private only (robots.txt)
User-agent: Slackbot-LinkExpanding Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block Slack Link Expander if ($http_user_agent ~* "Slackbot-LinkExpanding") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block Slack Link Expander SetEnvIfNoCase User-Agent "Slackbot-LinkExpanding" bad_bot Order Allow,Deny Allow from all Deny from env=bad_bot
Meta robots tag
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is Slack Link Expander safe to allow?

Yes, Slack Link Expander is a safe and legitimate crawler operated by Slack. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Verify by reverse-DNS lookup: legitimate Slack Link Expander requests resolve to Slack's domain.

What does Slack Link Expander do?

Understanding Slack Link Expander's purpose helps you decide whether to allow or block it.

  • Indexes web pages for AI-powered search answers
  • Surfaces your content as citations inside AI search results
  • Builds a knowledge index used to answer user questions
  • Allowing it can increase visibility in AI search
  • Respects robots.txt directives

Frequently Asked Questions

What is the official user-agent string for Slack Link Expander?
The official user-agent string for Slack Link Expander is: Slackbot-LinkExpanding. Use this exact string in robots.txt, Nginx, Apache, or Cloudflare firewall rules to target this bot. Matching in robots.txt is case-insensitive. Verify a request genuinely comes from Slack Link Expander by performing a reverse-DNS lookup on the source IP.
Is Slack Link Expander safe?
Yes, Slack Link Expander is a safe and legitimate crawler operated by Slack. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Will blocking Slack Link Expander hurt my SEO?
🔶 AI Visibility Trade-off - Blocking Slack Link Expander will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
How do I block Slack Link Expander in robots.txt?
Add the following lines to your /robots.txt file:
User-agent: Slackbot-LinkExpanding
Disallow: /

This instructs Slack Link Expander not to crawl any path on your site. To block only specific sections, replace / with the path (e.g., Disallow: /blog/).
Does Slack Link Expander respect robots.txt?
Slack Link Expander is operated by Slack and is expected to fetch and parse /robots.txt before crawling, following RFC 9309. For hard enforcement, combine robots.txt with server-level IP or user-agent blocking.
How do I verify if Slack Link Expander is crawling my site?
Search your web server access logs for the string Slackbot-LinkExpanding (case-insensitive: grep -i "Slackbot-LinkExpanding" /var/log/nginx/access.log). Filter by user-agent in your log analytics tool (GoAccess, AWStats, etc.).

Related Bots