OpenCodeReview is an AI-powered code review CLI tool originally developed as Alibaba Group's internal assistant, having served tens of thousands of developers and flagged millions of defects. It uses a hybrid architecture combining deterministic engineering pipelines with an LLM agent to deliver precise, line-level review comments on Git diffs. The tool supports multi-language rule sets covering issues like NPE, thread-safety, XSS, and SQL injection, and is compatible with OpenAI and Anthropic model endpoints. OpenCodeReview integrates with CI/CD pipelines, coding agents like Claude Code and Cursor, and supports full-file scanning for auditing unfamiliar codebases.