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.
A new environment variable for SDK hosts (desktop apps, IDE extensions) to signal that the API provider is managed by the host application, preventing users from accidentally overriding the provider configuration.
Evidence
Host-managed provider (search for "CLAUDE_CODE_PROVIDER_MANAGED_BY_HOST")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
