Say "create a pr" and Claude will push the current branch, then run gh pr create with a title and body it writes from the commit history. The PR body includes a summary and a test plan checklist.
claude --from-pr 123 resumes a session linked to PR #. Claude fetches the PR diff and comments, so it understands exactly what the PR contains before you type anything (CLI Reference). I find this useful when you pick up a PR review after a break or when a teammate opens a PR and asks you to take over. You can also run the /commit-push-pr skill to do all steps in one command.