run

Executes the tool and returns its result.

The result must be JSON-native: a Map, List, String, number, Boolean, or null; a non-Map result is wrapped under RESULT_KEY. Returning a non-JSON type such as a Kotlin data class throws when the resulting event is persisted. To return structured data, return a Map, or expose the function via com.google.adk.kt.annotations.Tool, which converts data classes (and enums, lists, and nested structures) into Maps automatically.