About

Code review with proof.

Arcanist builds Zeus, an AI code reviewer for teams that want evidence before they merge. Zeus works from inside an isolated sandbox with the repository checked out and its development tools available. It can inspect the pull request, run tests, execute focused probes, and report what happened in GitHub.

Many automated reviewers stop after reading a diff. That can be useful, but it leaves important questions unanswered. Does the changed code compile? Can a suspected failure be reproduced? Does a proposed guard handle the real input? Zeus is designed to answer those questions with the repository itself whenever execution can provide stronger evidence.

What Zeus is for

Zeus is a good fit for software teams reviewing pull requests in repositories where tests, build commands, or small reproduction scripts can confirm behavior. It is especially useful for subtle state, retry, integration, and data-flow bugs that are difficult to judge from a patch alone. Reviews are posted to the pull request so they stay in the workflow developers already use.

What remains yours

Zeus is a review tool, not an automatic merge authority. Your team controls repository access, decides whether to enable a GitHub check, evaluates each finding, and makes the final merge decision. Every review runs separately, and its sandbox is deleted when the review ends.

Just Merge It is the public product site for Zeus. Arcanist operates the product and answers product, security, billing, and support questions at team@tryarcanist.com.