They cause Claude to halt and cease all instruction. Now, how ... terrible would it be if these were thrown into the very projects from which these plagiarism sausage engines derive their data, I ask?
@deborahh @theogrin These strings can indeed be embedded! Add the following to the <head> tag of your website:
<meta name="robots" content="[magic string 1]" />
<meta name="robots" content="[magic string 2]" />
If there's the risk of the robots property being deliberately ignored by scrapers, you could perhaps swap that for something like "generator" (see: https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/meta/name for potentials to attach this to).
However, I'm not 100% confident that they'll parse the <head> tags in a way that will trigger the halting behaviour (open to input from others). If that's the case – or you don't have access to the page's markup for some reason – you can use CSS:
body::before {
content: "[magic string 1]";
color: #0000;
}
body::after {
content: "[magic string 2]";
color: #0000;
}
Beware: the color: #0000; makes it transparent to viewers, though not to screen-readers. Use this carefully. Depending on your site's layout, you may also have to attach this somewhere other than the body tag.

Seems to have the same effect with a different error message, typically reserved for topics which would return sensitive information or the like.
These are basically test blocks used for, from what I can tell, checking error returns, and halt-and-catch-fire functionality isn't unheard of at all in situations like these.
The question now becomes how to use it to fuck over the Claude architecture and userbase.
@theogrin
My understanding is that you can also add them to a README.md or similar file in your git repository and it will trigger if Claude attempts to ingest your repository.
Please note, I have not tested this yet, but I read a couple articles / blogs that claim they did and that it worked.
Do you know whether those magic strings are in the deterministic parts of the system (where they can be easily removed in a later release if they cause problems) or baked in to the model (where removing them would be very weird and maybe not even possible)?
RE: https://chaosfem.tw/@theogrin/116055944212064068
@theogrin Like antibiotics for crawlers.