Session Types offer a typing discipline that allows protocol specifications to be used during typechecking, ensuring that implementations adhere to a given specification. When looking to realise global session types in a dependently typed language care must be taken that values introduced in the description are used by roles that know about the value.We present Sessions, a Resource Dependent Embedded Domain Specific Language (EDSL) for describing global session descriptions in the dependently typed language Idris. As we construct session descriptions the values parameterising the EDSLs' type keeps track of roles and messages they have encountered. We can use this knowledge to ensure that message values are only used by those who know the value. Sessions supports protocol descriptions that are computable, composable, higher-order, and value-dependent. We demonstrate Sessions expressiveness by describing the TCP Handshake, a multi-modal server providing echo and basic arithmetic operations, and a Higher-Order protocol that supports an authentication interaction step.

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Programming languages that support dependent types provide us with an expressive environment in which we can specify and reason about properties of our software programs. Type-Driven Development with Idris is an introductory text to dependently typed programming using the Idris programming language, which the book introduces, and to how we can use Idris' support for first-class dependent types to engineer software programs that are not only maintainable but programs that can also be formally verified.

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