cast(bool, x) is a promise to the type checker. At runtime it is the identity function.

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In google/adk-python , the value that decides whether a tool call needs human confirmation reaches its caller through cast(bool, await ...) . typing.cast returns its second argument. That is the entire implementation: def cast ( typ , val ): """ Cast a value to a type. This returns the value unchan…

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1. 2026-09-12 15:08 · DEV Community — AI
   cast(bool, x) is a promise to the type checker. At runtime it is the identity function.