Slackbot-LinkExpanding is Slack's link-unfurling bot. When a user posts a URL in a Slack channel or DM, the bot fetches the page to render the rich preview card (title, description, image, oEmbed). Operated by Slack (a Salesforce company).

At a glance

Operator: Slack
Type: Preview

How Centinel checks it

User agent: The request calls itself this crawler. Anyone can send the same string.

Slackbot-LinkExpanding publishes nothing Centinel can check a source against, so a match reports the name and leaves the source unconfirmed. The match tokens, verification domains, and address feeds are not published here.

Allowing or blocking it

The crawler object in the /validate response sets access_allowed to true only for a verified source that your tenant allowlists. A policy rule can allow or block this crawler by its category, Preview.

Back to the crawler catalog