Blogs posted in April 2026

In Part 1, I shared the Claude Code prompt that kicks off a CMS 12 to 13 upgrade - analysing the codebase, planning the migration steps and doing the heavy lifting on the code changes. That gets you a long way. But the upgrade isn't fully done when the site starts.

The gap between "it compiled" and "it's actually correct" is where things go wrong in production and that's where upgrades earn their reputation. Manually comparing two environments across dozens of URLs is tedious, inconsistent, and easy to rush. So here's the second prompt in the workflow: the one I use to systematically QA the upgraded site against the reference.

The approach

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Interest in Optimizely CMS 13 has been incredibly high since it reached general availability and for good reason, it's the biggest shift the platform has seen in years, bringing with it AI tooling, a modern visual editing experience and a composable architecture that changes how you think about content delivery.

If you're on CMS 12 and wondering how to get started, I wanted to share something that has genuinely changed how I approach upgrades: using Claude Code to kick off the process.

Here's the prompt I used:

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