Leanscreen is a command-line tool and MCP service that performs fast and deep screening of Lean 4 statements. It uses lints, vacuity checks, elaboration against mathlib, dual-judge comparison, and counterexample search to identify statements that compile but fail to faithfully represent the mathematics they claim. It is designed for use in local development, CI pipelines, and before shipping formal proofs.
leanscreen sits in PulseGate's Developer Tools category. It focuses on detecting Lean 4 formal statements that compile successfully but do not accurately represent the intended mathematics described in their documentation. It is built as an open-source project for formal mathematicians and Lean 4 developers. leanscreen is free to use. It runs on the command line.
It is developed by Millennium Research, and the product first shipped in 2026. Development happens publicly on GitHub with 9 commits in the last 90 days. Key capabilities include Fast Screen, Deep Screen, and Vacuity Checks. It exposes integrations via an MCP server.
Latest indexed changes and source events
LeanScreen: Lean Verification verified by the PulseGate indexer
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