Claude Code ultrareview — parallel multi-agent cloud review

Ultrareview is a research-preview Claude Code feature that runs multiple review agents in isolated remote sandboxes, then combines their findings into one report. It requires claude.ai authentication; availability and billing depend on your plan.

/code-review ultra 1234
claude ultrareview origin/main

/ultrareview is also available as an alias in supported builds. The feature is best suited to medium-to-large diffs where parallel reviewers can inspect different parts of the change.

Official ultrareview documentation · Claude Code CLI reference