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GitHub integration method, not AI model, determines code review tool effectiveness

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The effectiveness of AI code review tools on GitHub depends primarily on how the tool connects to pull requests, not on model capabilities or vendor feature comparisons. Graphite staff engineer Sara Verdi outlined four integration patterns — dedicated webhooks, GitHub Actions, GitHub Apps or bots, and hybrid approaches — each with distinct tradeoffs around control, latency, cost, and permissions. A standard workflow involves a pull request event triggering a diff fetch, static analysis, LLM-generated comments, and posting results back via the GitHub API. Critical capabilities such as merge-blocking are determined by the integration type — for example, only a GitHub App with approval authority can gate merges, while a comment-posting Action cannot. Most vendor comparison guides, including Qodo's self-published ranking, lack methodology and function as marketing material rather than objective technical evaluations.

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