/trunk merge comment, or the merge checkbox, and Merge Queue takes care of testing and merging each segment. You can even enqueue multiple PRs from the same stack at once; Trunk sorts out the dependencies.
- Test the whole stack as one block. Trunk runs CI against the stack collectively instead of PR-by-PR, so you get real throughput and CI-cost wins on stacked work.
- Track stacks in the queue UI. A stack submission shows all included PRs together in the Merge Queue view.
- Submit from anywhere in the stack. No need to wait for lower PRs to merge before enqueueing higher ones.