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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.

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Claude Code v2.1.172 10 Jun 2026

Ultra (Cloud Review) — Improved Auth Error Messages

What

When ultra (cloud review) is unavailable, Claude Code now surfaces specific, actionable error messages depending on the exact auth state rather than a single generic message.

Details

API key auth → "ultra (cloud review) requires claude.ai account auth. Unset ANTHROPIC_API_KEY … to use ultra."
Missing profile scope → "ultra (cloud review) requires a full-scope login token — run claude auth login to use it"
Not yet in rollout → "ultra (cloud review) isn't enabled for your account yet — run claude auth login to refresh your entitlements"
Unauthenticated entirely → "ultra (cloud review) requires a claude.ai account — sign in to claude.ai to use it"
All error messages include a link to https://code.claude.com/docs/en/ultrareview

Evidence

Error routing function (search for "ultra (cloud review) requires claude.ai account auth")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.172 →