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.
The Edit tool now accepts the older old_str/new_str parameter names, automatically migrating them to old_string/new_string. This improves compatibility with older model outputs or cached tool schemas.
Evidence
Parameter migration (search for "old_str")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
