BlueprintRepair treats failed Lean proof repair as typed local edits to a dependency-graph blueprint. It provides ten schema-checked operations, identifies the node being edited, prevents modification of the target theorem, and requires Lean validation plus explicit declaration of used blueprint lemmas. The paper also introduces BlueprintTrace, a benchmark of 142 controlled failures with accepted and rejected trajectories. According to the abstract, typed repair solves nearly as many localized failures as exact source patches and full rewrites, while costing 1.30x and 2.06x less per solved state, respectively, with similar results across DeepSeek-V4-Flash and Qwen3.6-Flash.
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