How can I review a big PR without reading every line?
Last updated September 26, 2026
DiffGuardian reads a pull request against the whole repository it changes, then splits the change into the discrete features it actually ships and walks the reviewer through them one at a time, with the riskiest parts flagged first. Instead of scrolling one long, flat diff, the reviewer works through a short, ordered list of decisions.
#How the feature-by-feature review works
- DiffGuardian reads the pull request's diff together with the rest of the repository it touches, not just the changed lines in isolation.
- It groups the changed lines into the discrete features the pull request actually ships.
- It orders those features by risk, so the riskiest change is the one the reviewer sees first.
- The reviewer works through the features one at a time, instead of one flat diff.
This is built for the pull requests that make a flat diff unreadable: the hundreds of small pull requests an AI coding agent opens every day, and the single massive pull request an AI coding assistant produces in one shot.
DiffGuardian is a desktop app for macOS, Windows and Linux, and works with pull requests on GitHub, GitLab and Bitbucket.
#Limits
- DiffGuardian orders and explains the changes; it does not approve or merge anything. The decision stays with the reviewer.
- It needs an AI provider to run: your own key for Anthropic, OpenAI, Google Gemini or OpenRouter, or a local model through Ollama, LM Studio, llama.cpp or vLLM.
FAQ
What counts as one "feature" in the split?
A feature is one discrete piece of functionality the pull request ships. DiffGuardian groups the changed lines that implement it, rather than presenting every changed file as a single undifferentiated diff.
Does DiffGuardian only look at the diff?
No. It reads the pull request against the whole repository it changes, not just the diff in isolation, before splitting the change into features.
Does this help with pull requests an AI wrote?
Yes. It is built for exactly that: the hundreds of small pull requests an AI coding agent opens every day, and the large pull requests AI coding assistants produce in a single pass.
Does DiffGuardian approve the pull request for me?
No. It keeps the merge decision with the human reviewer — it orders and walks through the changes, but it never approves or merges a pull request on its own.