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Do Agent-Generated PRs Cost Review Time Even If They Never Merge?

A PR that is abandoned or rejected may still have used reviewer time. Here’s how to measure that effort without mistaking merge status or falling review time for the whole story.
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Yes—when someone spends time triaging or reviewing an agent-generated pull request (PR), that effort is real whether the PR merges, is rejected, is abandoned, or is superseded. But there is no reliable universal figure for the minutes spent on non-merging agent PRs. Teams should measure reviewer effort alongside PR outcomes, latency, and review quality rather than treating merge status as a record of whether review work happened.

Why a PR that never merges can still cost reviewer time

A PR can draw human attention before anyone decides whether its code should ship. A reviewer may inspect the description, check whether the change is relevant, request context, assess risk, or determine that the proposal duplicates or conflicts with other work. If the PR is later abandoned or rejected, those minutes do not disappear from the team’s workload.

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The size of that effort varies. Some submissions may be screened quickly; others may receive substantive review before their outcome is clear. A PR that receives no human attention should not be counted as reviewer time merely because it was opened. The useful accounting distinction is whether people actually spent time on it, not simply whether it merged.

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What the available evidence does—and does not—show

Salesforce reported pressure on its own review process

In a January 29, 2026 article, Salesforce Engineering authors Shan Appajodu and Ravi Boyapati described internal signals from their organization: code volume had increased by approximately 30%, PRs regularly grew beyond 20 files and 1,000 lines of change, and review latency rose quarter over quarter. They also said review time on the largest PRs began to plateau or decline. These are Salesforce-specific observations; the article does not provide a sampling method, baseline period, or estimate of time spent on agent PRs that never merge. Read the Salesforce Engineering account.

There is no supported minutes-per-abandoned-PR estimate

The available sources do not quantify how many reviewer minutes a non-merging agent PR consumes, either at Salesforce or across organizations. The claim that such PRs can create review cost is an accounting point: when people triage or review a submission, effort has been spent. It is not evidence for a fixed average cost or a universal increase caused by agent-generated code.

How to measure review effort without hiding abandoned work

For a defined team and time period, track reviewer time spent on both triage and substantive review, and record what happened to each PR. Compare the same team scope, period length, and PR categories when looking for changes over time.

  • Total reviewer time: count time spent on intake triage as well as deeper review.
  • Time per submitted PR: divide reviewer time by submissions in the period. This shows effort associated with intake, including PRs that do not merge.
  • PR outcomes: count merged, abandoned, rejected, and superseded PRs, and calculate each outcome’s share of submissions.
  • Time per merged change: divide reviewer time by merged changes. This can reveal review effort associated with delivered work, but it is a diagnostic—not a universal productivity score.
  • Latency and quality: track review delay and a quality check, such as whether required human review occurred and whether post-merge issues changed.

Report submission-based and merge-based measures together. A ratio can shift because the volume or mix of submissions changed, because work was bundled across PRs or periods, or because reviewers changed how they triage. Make the denominator and outcome definitions explicit so a comparison does not imply more than the data can show.

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How to interpret falling review time

Less recorded review time is ambiguous. It may reflect effective screening of low-value submissions, a change in PR mix, or reviewers engaging less with changes. In its own account, Salesforce said declining or plateauing time on its largest PRs indicated that “reviewers were no longer meaningfully engaging with changes.” That interpretation applies to the Salesforce trend described by Appajodu and Boyapati; it is not a rule that a shorter review always signals disengagement.

Check the time trend against outcomes, latency, whether required human review took place, and post-merge issues. If time falls while review requirements are being skipped or quality signals worsen, the lower figure should not be presented as an efficiency gain. If quick triage reliably screens out low-value submissions while substantive review remains adequate, the interpretation may be different.

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What a team should conclude

Merge status alone is not a complete account of review workload. Record human effort on submissions that do not ship, then read that effort alongside outcomes, delivery, and quality. The evidence supports this measurement approach, but not a single benchmark for the cost of an abandoned agent PR.

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