A pull request (PR) is a method for submitting code changes for review before merging them into a shared codebase. PRs contain the diff (what changed), a description of the changes, and space for reviewer comments and discussion.
In agent-assisted workflows, PRs serve as the primary handoff point between AI and human contributors. An autonomous coding agent produces a PR as its output, and a human reviewer evaluates whether the changes meet quality standards before merging.
The volume of PRs is increasing as agents generate code faster. This has created demand for AI-powered code review tools that can evaluate PRs at the same pace they are created.