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AnnouncementMicrosoft Research blog5 November 2026

Microsoft's new tool checks AI-written web app code against your stated requirements

Why it matters

Teams letting AI agents write production code get a way to check it against a written spec instead of reading every file.

Ask your team

Are we reading every line our AI coding agents write, and could a spec-based check replace that?

What happened

Microsoft Research released PDD Kit, a tool that converts a developer's goals into a , then mathematically proves the code an AI coding agent writes against it. Where proof isn't possible, it falls back to tests, and Microsoft demonstrates it on a full-stack web app.

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