Ai Reviewer

Presubmit AI Reviewer is an open source AI code reviewer that runs as a GitHub Action on every pull request. When a pull request is opened or updated, it analyzes the changes inside the repository's own GitHub Actions environment and posts in line comments and code suggestions, catching bugs, security issues and optimization opportunities before a human reviewer looks at the code. It is built for development teams on GitHub, with public or private repositories, that want automated first pass review without sending code to a separate hosted service. It keeps an overview of the codebase for context, runs incremental reviews as new commits arrive, and sets a deliberately high bar so that its comments are actionable rather than noisy. It can generate a pull request title and description, and developers can mention it in a comment to ask questions or request a suggested fix. Setup is a single workflow file that references the action and two secrets, a GitHub token and an LLM API key. It works with Anthropic, OpenAI and Google models, and with OpenRouter and other OpenAI compatible providers through a configurable base URL, with SAP AI Core also supported. Presubmit is free to use. Users bring their own model API key, so the only cost is model usage billed by the chosen provider. Because review runs inside your own workflow with your own key, code stays in your own environment and no third party service needs access to the repository beyond the model provider you choose.