In version 0.1.4, mods can now configure the repost-bot to watch a community and complain when a user reposts an image too often. The mod configures the community by PMing the bot with something along the lines of

{"https://sh.itjust.works/c/repostbot_comm": { 
  "action": "comment", 
  "minRepostIntervalSeconds": 60, 
  "allowRepostsFromOtherCommunities": false 
}}

You can see an example of this groundbreaking behaviour here.

Next up: adding reporting and removal of posts.

repost-bot can indicate if an image post is a repost of a previous image. It's presently running on sh.itjust.works as @repost@sh.itjust.works.

When summoned to an image post, repost-bot will respond with whether it has seen the image before.

Mod tools are under development. That would allow moderators of communities finer control over its actions. See the issues list for more details.