Claude Code launches /ultrareview, multiple agents review code in parallel in the cloud to find bugs.

ME News, April 23 (UTC+8), according to Beating monitoring, Anthropic has introduced /ultrareview\ (research preview) in Claude Code, a cloud-based multi-agent code review feature. When users type /ultrareview\ in the CLI, the system launches a group of review agents in a remote sandbox to inspect the diff between the current branch and the default branch (including uncommitted changes). Users can also directly review a GitHub PR by passing a PR number. The entire process does not consume local resources and takes approximately 5 to 10 minutes, with results returned to the session as notifications. The key difference from local /review lies in the verification mechanism: each finding is reproduced and confirmed by an independent agent, focusing on real bugs rather than code style suggestions. The official documentation positions the two as tools for different stages: /review\ is for quick feedback during coding, while /ultrareview\ is for in-depth review of critical changes (such as authentication, data migration) before merging. In terms of billing, /ultrareview\ uses extra usage billing and does not consume plan-included usage. Pro and Max users each get 3 free credits before May 5 (one-time, non-renewable), after which each session costs approximately $5 to $20, depending on the scale of changes. Team and Enterprise users have no free credits. This feature requires authentication via a Claude.ai account and is not available on Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry, or organizations with zero data retention enabled. (Source: BlockBeats)
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