CR Cab

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CR Cab

Auto-assign GitHub PR reviewers based on who’s actually available in Slack.

Install in 5 minutesHow it works

The problem

PRs sit waiting while you figure out who's free to review. You post in Slack, wait for volunteers, or assign someone who might be heads-down. It's a small friction that happens many times a day.

How CR Cab helps

Engineers set their availability in Slack with a simple command. When a PR opens, a GitHub Action checks who's available and assigns a reviewer automatically. No more guessing or waiting.

How assignments work

  • Priority is P0 / P1 / P2. If nothing is selected, CR Cab treats the PR as P1 (default).
  • Engineers opt in using Slack slash commands (e.g. /cr_p1), and CR Cab stores that availability per org + user.
  • When a PR opens, the GitHub Action asks CR Cab for the current eligible pool at that priority (only people who have linked a GitHub username are returned).
  • If nobody is available, CR Cab returns an empty list — nothing is auto-assigned, so you can assign manually.

Looking for a deeper explanation? Read about code review assignment and how availability-based assignment works.