Mode · Automation: PR review. Durable session, woken by an external system, often no human in the loop.
Burke LibbeyPrincipal Engineer · Practitioner, 
Shopify
Post: Under the River, Shopify engineering blog, May 28, 2026.
Filed under
- How is AI used in code review?
- How do coding agents open and merge changes?
- How autonomous are the agents, and who checks their work?
Who is speaking
Burke Libbey, Principal Engineer. Engineer on the infrastructure behind River writing about Libbey's own team's system; the post is the company's own publication.
How this was checked
Checked against the source by a first reader, then confirmed independently by a second reader who fetched the source without seeing the first reader's notes (Independent review agent (Claude Sonnet), blind second pass from passage text and citation only, no repository access, 2026-10-31).
Raw HTML fetched with curl. The page text reads 'Mode · Automation: PR review. Durable session, woken by an external system, often no human in the loop.' The 'Automation:' label is bold in the HTML. The byline is Burke Libbey, Javier Moreno and River, so the post is co-authored.
How to cite this passage
Burke Libbey (Shopify), “Under the River”, Shopify engineering blog, 2026-05-28. https://shopify.engineering/under-the-river Archived at https://the-ai-record.com/passages/shopify-mode-automation-pr-review-durable-session-woken-2026
More from the same source
3,536 River-coauthored pull requests merged in that window.
Burke LibbeyPrincipal Engineer · Practitioner, Shopify
Post: Under the River, Shopify engineering blog, May 28, 2026.
- 3,536 agent prs, 30 days to about 2026-05. Level not stated
In a recent 30 day period: 59,918 River sessions happened in 5,170 Slack channels, touching the work of 7,000+ people inside the company
Burke LibbeyPrincipal Engineer · Practitioner, Shopify
Post: Under the River, Shopify engineering blog, May 28, 2026.
Something wrong? Report a correction. JSON: /api/v1/passages/shopify-mode-automation-pr-review-durable-session-woken-2026.json