I agree that throwing accusations around based on writing style or use of certain punctuation or feeding the text into some dubious "AI detector" are all rather pointless, annoying and causes fractures in the community, but if THIS is the Claude-detector skin people are talking about, then the framing in this post is entirely disingenuous.
Because I don't expect people to go to another link, here's the short version, as per the thread:
"When a Claude-generated response is pasted directly into AO3 from Claude, the text is wrapped by a Claude-injected code âfont-claude-response-bodyâ. Its presence indicates the use of Claude definitively. Its absence does not rule it out."
THIS is what the skin checks for. That is ALL it does. Here, the skin's code in my own skin editor:
If "font-claude-response-body" exists in the work, the skin turns the page an obnoxious bright red.
This is not something that can accidentally end up in the work or something that indicates that oh, the person just used an AI-powered spell-checker or something. It only checks for this one thing and nothing else: whether they directly copied something from Claude into the AO3 text editor. I frankly don't see how this could produce "false positives" when it's set up properly, but I'm only willing to give this tool a pass because it's so transparent about how it works and what it does.
I dislike witch hunts as much as the next person and in an ideal world people would be transparent about their use of genAI in whatever capacity they used it and people could decide if they want to engage with their works or not, but right now that's not the case.
While I was testing the skin it flagged two works (which, when I checked the site's HTML to verify, both included a lot of sections copy-pasted from Claude) and both of them had plenty of anti-genAI tags, loudly broadcasting an anti-genAI stance and claiming to be entirely man-made, because it turns out that a lot people don't want to read what the plagiarism machine spat out and the people writing their stories with the plagiarism machine are lying because they don't want to lose potential readers.
If you don't want to use the skin, if you think that just a little bit of copy-pasting from Claude is no big deal, then nobody forces you to use it. You don't have to agree with the people who use it, but for the love of everything, don't lie about what it is or what it does, because all you are doing right now is playing devil's advocate for people who are lying for clout and engagement in a hobby space.