Show HN: Circuit Breaker – Score Pull Requests

Circuit Breaker, a GitHub Action that assigns risk scores to pull requests at creation time, was posted to Hacker News on August 21, 2026 by user glassrun via a Show HN submission.

Per the Show HN post, the tool is described as a "creation-time PR risk triage GitHub Action" — meaning it evaluates a pull request for risk the moment it is opened, before any review takes place. The project is hosted at the Circuit Breaker GitHub repository.

The action is based on research by Minh et al., published at the Mining Software Repositories (MSR) conference in 2026 and available as arXiv preprint 2601.00753, according to the Show HN description. The underlying paper provides the scoring methodology the action applies to incoming pull requests, though the post does not detail the specific features or signals the model uses to compute risk.

Automated pull request triage sits within a broader category of developer tooling aimed at reducing review bottlenecks in engineering teams. By surfacing a risk score at creation time, tools like Circuit Breaker allow reviewers to prioritize high-risk changes before committing review bandwidth. No competitor tools or market comparisons were mentioned in the source.

No company, funding, team size, or commercial details are associated with the project in the available source material. The post received 2 points and no comments on Hacker News at time of publication. No forward-looking roadmap or expansion plans were stated.