# Contract Generation¶

Disclaimer: This feature is very experimental. In particular, the modes (if any) of the contracts generated might not be exhaustive. In this case, Kind 2 will reject the contract during the mode exhaustiveness check.

Contract generation is intended, at least for now, as a helper for users to getting started with Kind 2’s contract language. Contract generation is activated by the flag --contract_gen.

Internally, this feature is implemented by running invariant generation on the input system up to some depth, specified by flag --contract_gen_depth. Doing so will discover equivalence and implication invariants over the system. The ones that talk only about the input / outputs of the systems are used to create the contract dumped in a Lustre file in the output directory. Note that the restriction to just input and output variables causes many of the generated invariants to be discarded currently.