As of October 2025, the AI code review tool formerly known as Diamond has been rebranded under the Graphite Agent, emphasizing its role within the Graphite platform. Originally launched as a standalone product, Diamond was separated from Graphite to improve accessibility, allowing teams using AI code generation tools like Copilot to integrate it into their workflows on GitHub, even if they don't use Graphite. Diamond offers free reviews for up to 100 pull requests monthly, making it an attractive option for startups. It enhances the "outer loop" of development—code review, testing, merging, and deployment—by drastically reducing code review times and offering customizable rules and feedback. While Diamond significantly improves code review efficiency, it reaches its full potential when used with Graphite's entire platform, which includes features like stacked pull requests, an automated merge queue, CI optimizations, and a unified PR inbox to streamline the development process. Diamond is available independently but also complements Graphite's comprehensive suite, aiming to enhance developer productivity and adapt to modern software development needs.