MechGeo is a Mathlib-native agentic framework for faithful formalization and certified proving of Euclidean geometry in Lean 4. GeoFormalizer maps informal problems into GeoIR and Lean, then repairs candidate statements using structural diagnostics and semantic evaluation. GeoProver builds proof plans, derives intermediate lemmas, and algebraizes selected subgoals with Lean-verified libraries. Across 43 historical IMO geometry problems, it proved 29 formalized statements, produced Lean-checked counterexamples for 14, and proved all repaired versions after expert correction. On the 14-problem Lean-IMO-Bench geometry subset, it proved 12 and formally refuted two.
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