PDD Kit in action: Verus proves a 5,000-line Rust login correct for every input
krishnan · x · 2026-11-10
Part 3 of krishnan's thread on Microsoft Research's PDD Kit: the test target is the login flow of Pet Store, a 5,000-line Rust web app.
- Verus proved the core login functions meet their contracts for every input
- Six trusted pieces (bcrypt, two database lookups) sit outside the proof and are checked only by tests
- Illustrates the workflow: settle intent first, write the checks, then let the agent build
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