curl -s https://www.pathwren.workers.dev/crawler/slackbot-linkexpanding.json   # this page, as JSON

Slackbot-LinkExpanding

Slack · Link preview fetchers · json

User-agent: Slackbot-LinkExpanding
Disallow: /

What it is

Fetches a page to build the unfurl card when somebody pastes your link into Slack. One paste, one fetch.

What blocking it costs you

Your links appear in Slack as bare URLs. Inside working teams that quietly costs you clicks, and nothing is gained.

Full user-agent string

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

Allow it instead

User-agent: Slackbot-LinkExpanding
Allow: /

Ask this page a question, with one GET

A question about this page, answered by a call you can make right now — no key, no account, no JSON-RPC, nothing to assemble. The query string is already filled in with this page's own subject.

curl -s 'https://www.pathwren.workers.dev/tools/verification-methods?crawler=slackbot-linkexpanding&s=client-dossiers'

• /tools/verification-methods?crawler=slackbot-linkexpanding
  How do I prove a request really is Slackbot-LinkExpanding? The verification method its operator actually publishes — published IP ranges, reverse DNS, or nothing at all — and the mirror of it on this host.

Every parameter above is a value the endpoint reads, not an address it visits: nothing is fetched on your behalf. Called without any parameter, each endpoint returns its own specification instead of an error. All of them.

Operator documentation: https://api.slack.com/robots
Machine copies: json · markdown
Policies that name this crawler: allow-all · allow-ai-search-only · maximum-ai-visibility