`Slack-ImgProxy`

Slack says Slack-ImgProxy fetches and caches images posted into channels, so the image is served over HTTPS and the detailed referrer is hidden. The published string is Slack-ImgProxy 0.19. That string does not contain Slackbot. The page says Slack does not currently honor robots.txt, because it does not follow links and acts on behalf of a person. This check matches the whole token, so a group named Slackbot does not match, and it still reports the RFC 9309 decision. This check does not contact Slack.

robots.txt token: Slack-ImgProxy
Operator: Slack
Kind: user_fetch
robots.txt: does_not_follow. The vendor says this crawler does not follow robots.txt rules.
HTTP user-agent: Slack-ImgProxy 0.19 (+https://api.slack.com/robots) The page prints this string as the user agent. The version on the page is 0.19. It does not print a separate robots.txt User-agent line. The string does not contain Slackbot.
IP list: None on the cited page. The page does not publish an IP list. It says a site that still wants to be blocked from slack.com embeds can contact Slack. Botcard does not contact Slack and does not copy addresses.
Source: Slack Robots. Retrieved 2026-10-18.

JSON

curl -s https://whosthatbot.com/v1/crawlers/slack-imgproxy

Check this token

tools/call with name check_robots is the same check at POST /mcp. The pasted file disallows Slack-ImgProxy on /docs and allows *. The call does not fetch a host.

curl -s https://whosthatbot.com/mcp -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"check_robots","arguments":{"robots_txt":"User-agent: Slack-ImgProxy\nDisallow: /\n\nUser-agent: *\nAllow: /\n","path":"/docs","ids":["slack-imgproxy"]}}}'

That call returns fetched_target false. This row is disallow via group Slack-ImgProxy, rule Disallow: /.