Microsoft Says 50% AI Code. Here's What That Actually Means for Engineers

I was in a conversation recently with a senior engineering leader at Microsoft. He mentioned, almost in passing, that their development teams now carry an internal target: generate 50% of production code using AI tools. Not a stretch goal. A target. I've been thinking about what that actually means for the working engineer - not the headline version, but the granular, day-to-day reality of what changes and what doesn't. What the 50% number is measuring First, let's be precise about what "50% AI-generated code" means, because the metric itself is underspecified.