Worked on the Lean4 repository to improve the reliability of proof tactics by addressing a bug in the generalize tactic. Focused on metaprogramming and tactic development in Lean, the work ensured that only visible hypotheses are generalized, using getLocalHyps to filter out implementation details and prevent unintended interference with user proofs. Added a regression test to verify the corrected behavior and safeguard against future regressions. This targeted fix enhanced the stability and predictability of proof workflows in Lean4, reducing the risk of breaking existing proofs due to changes in tactic generalization. The work demonstrated careful attention to theorem proving robustness.