I've been building computer-use agents prototypes for the last few months and I had a reoccurring problem: many sites the agent should be able to use (common SaaS dashboards, retail sites, newspapers etc) just block it by recognizing them as non-humans. The problem is that this always leads to longer execution times since the agent doesn't know when to call it quits and just runs in a loop until forced timeout or worse it returns hallucinations. This was especially bad for swarm projects that require a lot of research being done in parallel but they featured a consistent 40%-60% block rate.So I decided to build a probe script: a Chrome-controlled browser (matching the fingerprint of a real CUA setup) probing blocking mechanisms of URLs on the internet and tagging each one green/red based on whether the page loads or which WAF vendor stepped in (in some cases a CUA harness is used to get better precision). The result is guestlist - a Python API that lets you check if a URL is open to in...