DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
TLS certificate validation now explicitly checks for the basicConstraints extension. Certificates missing this extension are rejected with: "Certificate is missing basicConstraints extension and cannot be used as a CA."
Evidence
New validation check (search for "Certificate is missing basicConstraints extension")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.