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Lab notes
Formally verifying agent-written full-stack web apps with PDD Kit
AI agents can generate code at a scale that’s hard for humans to review line-by-line. PDD Kit helps ensure the code is doing what the developer intended by creating formal specifications and testing against them. It converts developer intent into a Verus specification, proves AI-generated code meets it for every input, and uses tests where proofs aren't practical. Developers review intent, not every line.
Coding agents now ship whole features in one sitting often spanning tens of thousands or hundreds of thousands of lines of code. As a result, reading every line of the pull request doesn’t scale to this new way of work. Now, most teams invest in the plan and relevant testing instead: describe to an agent what they want, go back and forth until the plan and proposed tests look right, and hand them off to the agent for implementation.
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