# How to Understand an AI-Generated Pull Request

> Understand an AI-generated pull request by mapping the request to the diff, tracing its data flow, and isolating every assumption before approval.

- Canonical HTML: [https://unrust.dev/use-cases/understand-an-ai-generated-pull-request](https://unrust.dev/use-cases/understand-an-ai-generated-pull-request)
- Markdown representation: [https://unrust.dev/use-cases/understand-an-ai-generated-pull-request/index.md](https://unrust.dev/use-cases/understand-an-ai-generated-pull-request/index.md)

Published: 2026-07-14

## Direct answer

Understand an AI-generated pull request by working from the requested behavior outward: identify the entry point, follow the changed data through each boundary, and compare the final observable effect with the request. Review a large generated diff in small slices, because a coherent summary can conceal unrelated edits, duplicated logic, or a changed assumption far from the headline feature.

## Map the request to files and behavior

Start with the product request and write down the user-visible change it requires. Then locate the specific files, callers, tests, and interfaces that implement that path. If a changed file cannot be connected to the request or a necessary boundary, it deserves an explicit explanation before it becomes part of the patch.

## Trace the changed value end to end

Pick a representative input and follow it through validation, transformation, storage, and output. Note where types are widened, data is defaulted, or errors are caught. This turns a broad diff into an auditable sequence and exposes whether the summary skipped a behavior-changing transition.

## Practice loop

1. Write the requested user-visible behavior before reading the pull request summary.
2. For one changed path, list its input, transformations, external boundaries, and output.
3. Flag every changed file that has no clear link to the stated behavior or its tests.

## Limits of this page

A pull request may depend on architectural and product context that is not visible in one diff. This approach helps make uncertainty explicit, but a short timed review cannot determine whether a missed connection reflects decay, unfamiliarity, scope, or ordinary review time pressure.

## Source context

Editorially reviewed for Unrust using public language documentation, common code-review practice, and small original examples written for this resource system.

## Related resources

- [How to Review AI-Generated Code Safely](https://unrust.dev/use-cases/review-ai-generated-code/index.md): Use a contract-first review loop to inspect AI-generated code, test risky boundaries, and decide whether a proposed change is ready to merge.
- [TypeScript Code Tracing Practice for Developers](https://unrust.dev/languages/typescript/code-tracing/index.md): Trace TypeScript by following runtime values through narrowed unions, object references, and async branches while using type declarations as hypotheses rather than execution records.

Next step: [Take the free diagnostic](https://unrust.dev/diagnostic/index.md)