We present our preliminary work towards a comprehensive solution for the hybrid (static + dynamic) verification of open distributed systems, using session types. We automate a solution for binary sessions where one endpoint is statically checked, and the other endpoint is dynamically checked by a monitor acting as an intermediary between typed and untyped components. We outline our theory, and illustrate a tool that automatically synthesises type-checked session monitors, based on the Scala language and its session programming library (lchannels).


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