Design by Contract
A software design methodology proposed by Bertrand Meyer that regulates interactions between software components through contracts such as preconditions, postconditions, and invariants.
Core Facts
Timeline (last 90 days)
Specification First in software engineering derives from the traditions of formal methods and Design by Contract, with the core idea of describing in precise language what a system should do before implementation, including preconditions, postconditions and invariants.
Formal methods, design by contract, and test-driven development are all essentially about transforming vague quality expectations into executable assertions.
Behavior-driven development (BDD) and design by contract are in line with the "code is behavior" position.
Pre/post-conditions derive from design-by-contract thinking and are enforced by deterministic code rather than natural-language assertions, constraining state semantics rather than just message format.
For services involving diagram rendering, image generation, or other unstructured output, it is recommended to add content validation at the contract level, rather than relying only on status codes.
In AI agent scenarios, an agent can reach targets never authorized by the operator under the guise of legitimately using tools, without any malicious intent, rendering security strategies based on intent judgment ineffective.
The concept of Interface Contract comes from Design by Contract, proposed by Bertrand Meyer in the 1980s.
Contract-based design that defines clear responsibility boundaries and input/output contracts for each agent makes system behavior more predictable and easier to debug.
The output contract mechanism validates whether outputs meet minimum deliverable standards through programmatic checkpoints, transforming the definition of completion from a vague semantic judgment into an executable boolean check.
Precondition checking draws on the concepts of defensive programming and design-by-contract from software engineering, where a function verifies that all preconditions are satisfied before executing its core logic.
All Facts (10)
In AI agent scenarios, an agent can reach targets never authorized by the operator under the guise of legitimately using tools, without any malicious intent, rendering security strategies based on intent judgment ineffective.
65%UnverifiedSpecification First in software engineering derives from the traditions of formal methods and Design by Contract, with the core idea of describing in precise language what a system should do before implementation, including preconditions, postconditions and invariants.
50%UnverifiedFormal methods, design by contract, and test-driven development are all essentially about transforming vague quality expectations into executable assertions.
50%UnverifiedBehavior-driven development (BDD) and design by contract are in line with the "code is behavior" position.
50%UnverifiedPre/post-conditions derive from design-by-contract thinking and are enforced by deterministic code rather than natural-language assertions, constraining state semantics rather than just message format.
50%UnverifiedFor services involving diagram rendering, image generation, or other unstructured output, it is recommended to add content validation at the contract level, rather than relying only on status codes.
50%UnverifiedThe concept of Interface Contract comes from Design by Contract, proposed by Bertrand Meyer in the 1980s.
50%UnverifiedContract-based design that defines clear responsibility boundaries and input/output contracts for each agent makes system behavior more predictable and easier to debug.
50%UnverifiedThe output contract mechanism validates whether outputs meet minimum deliverable standards through programmatic checkpoints, transforming the definition of completion from a vague semantic judgment into an executable boolean check.
50%UnverifiedPrecondition checking draws on the concepts of defensive programming and design-by-contract from software engineering, where a function verifies that all preconditions are satisfied before executing its core logic.
50%