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.
API refusal responses now include the model's explanation when available, providing more context about why a request was declined. The explanation text is truncated to 400 characters and appended to the standard policy violation message.
Evidence
Refusal message enhancement (search for "has_explanation")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
