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Cut over a 45-million-message alerting system with Claude Code and an operator go

Kaizen (Ashish Tonse, Oct 6, 2026) moved a nine-year-old alerting system that had sent/received 45 million messages onto their main platform with Claude Code running a 61-step runbook.

Reported by Ashish Tonseon kznconsulting.com

A prompt to try

You are running our cutover from this runbook page. For each step:
1. Restate the command and expected output.
2. If the step is GO, wait for my explicit “go”.
3. Run it, compare output, write pass/fail + raw output to the dashboard.
4. On mismatch: stop, propose a fix, wait.
Start at step 1. Never skip a GO.

Fill in anything in [brackets] before you send it. Anything that spends money, sends a message or signs something should stay behind your own approval.

How it went, step by step

  1. 01Put every step on one page: command, expected output, failure action, GO or not.
  2. 02Dry-run until mismatches become runbook fixes, not surprises.
  3. 03On the day: Claude runs reads alone; waits for the operator on writes.
  4. 04Log each result to a shared dashboard before the next step.
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