AI Code Review in Production: Usage, Comments, and Adoption of ReviewHelper at Mozilla

Replication package for the paper "AI Code Review in Production: Usage, Comments, and Adoption of ReviewHelper at Mozilla". The package contains the data and scripts behind our study of ReviewHelper, the AI code-review agent Mozilla deployed on Phabricator in February 2026: Data: Phabricator revisions from seven months before and seven months after the deployment (autoland), ReviewHelper's inline comments with their resolution and comment-type labels (Claude Sonnet 4.6 and GPT-5.4), developer feedback, and the manual validation samples. Scripts: the full collection and analysis pipeline (src/pipeline/), the comment-type classification (src/LLM-Comment-Types/), and a Jupyter notebook that reproduces the paper's figures and statistics (src/PlottingData/Plotting.ipynb). All figures and numbers of the paper can be reproduced from the included data without API keys. Rerunning the collection and LLM classification requires Phabricator, Anthropic and OpenRouter API keys. See README.md in the archive for setup and step-by-step instructions.