Kiro verifies its Lean 4 agent harness properties

Kiro built an automated verification workflow using Lean 4 to model and prove properties of its own agentic harness code across three repositories. The system checked 96 candidate properties, proving 70 of them and reproducing 18 edge-case failures as concrete counterexamples in the real code. This demonstration highlights how formal proof assistants can catch hidden concurrency and state-management bugs that ordinary test suites miss. Open article →