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Natural-language specifications remain semantically ambiguous, and example-based tests sample only part of the behavioral space. Used alone, neither provides a sufficient control boundary for automated software construction. We introduce Protocol-Driven Development (PDD), a development model in which the primary software artifact is a machine-enforceable protocol rather than implementation code. We define a protocol as the triplet P = (S, B, O), where S specifies structural invariants, B specifies behavioral invariants, and O specifies operational invariants. Their conjunction defines the admissible implementation space of a software component. Under PDD, implementations are treated as replaceable realizations discovered through","title":"Protocol-Driven Development: Governing Generated Software Through Invariants and Evidence","url":"https://arxiv.org/abs/2605.12981","vendor":"arxiv_cs_ai"},"summary":"arXiv:2605.12981v1 Announce Type: cross \nAbstract: Automated program synthesis has reduced the cost of producing candidate implementations, but it introduces a harder governance problem: determining which generated artifacts are admissible in a software system. Natural-language specifications remain semantically ambiguous, and example-based tests sample only part of the behavioral space. Used alone, neither provides a sufficient control boundary for automated software construction. We introduce Protocol-Driven Development (PDD), a development model in which the primary software artifact is a machine-enforceable protocol rather than implementation code. We define a protocol as the triplet P = (S, B, O), where S specifies structural invariants, B specifies behavioral invariants, and O specifies operational invariants. Their conjunction defines the admissible implementation space of a software component. 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