Slackbot (Link Expanding)

Listed only

Slack's crawler that expands links posted in channels into rich previews by reading oEmbed, Twitter Card, and Open Graph metadata. Slack documents the User-Agent strings but publishes no IP ranges or other verification method.

Operated by Slack · Official documentation

User agents

Patterns this directory matches, with real observed strings.

regexSlackbot
observedSlackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)
observedSlackbot 1.0 (+https://api.slack.com/robots)

How to verify

No verification recipe published by the operator.

Good Bot Practices scorecard

Identifies honestly
Stable UA token documented (1 pattern)
Verifiable
Operator publishes no verification path
Respects robots.txt
Does not honor robots.txt
Behaves
Crawl-rate behavior is operator-declared; not machine-verifiable from this dataset
Reachable operator
Operator and documentation published

Measured against the Good Bot Practices.