Harvard study of 718 firms: coding agents add 30% more code but no measurable rise in resolved issues
Using Jellyfish data on about 300 million work events, Fiona Chen and James Stratton find agent adoption raised lines, commits, and PRs by 20 to 30% while completed Jira issues and epics showed no statistically significant gain. They point to review as the bottleneck: PR submission-to-merge time rose 49% (3.45 days), change requests nearly doubled, and comments per PR rose 35%.