Reviewing an Agent PR That Adds Request Coalescing: The Colliding Cache Key, the Test That Lied, and the Meter That Double-Charged
A pull request landed at 09:40 with a confident summary. It claimed to add single-flight deduplication of model calls. It promised roughly 40% token savings. The diff was 214 lines: two new files, one edited test, one config flag. The reviewer's job was not to grade intent. It was to decide three t…
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- 2026-11-06 16:41 · DEV Community — AI
Reviewing an Agent PR That Adds Request Coalescing: The Colliding Cache Key, the Test That Lied, and the Meter That Double-Charged