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How I Killed 63 Flaky Tests in One Week With Claude Code: 5 Lessons

TL;DR I had 63 flaky tests in a Node.js monorepo that made every CI run a coin flip. Over one week I pointed Claude Code at them with a reproduction harness instead of a "please fix this" prompt, and…

  • Reporter eliminated 63 flaky tests in one week using Claude Code
  • Diagnosed flaky tests by measuring their pass/fail rates over 20 runs
  • Claude Code fixed 58 out of 63 flaky tests, improving CI pipeline reliability

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