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Create Tool values and pass them through DefineTool(...). Tools can include:
  • JSON Parameters shown to the model
  • InputSchema, OutputSchema, and EventSchema validators
  • a Timeout and Execute(input, RuntimeContext) function
  • unconditional RequireApproval or a conditional Approval predicate
  • OnToolCalled and OnResponseReceived for interactive work
  • NextTurn overrides and OnError: "return-to-model"
Use RuntimeContext.EmitProgress, SetContext, and the supplied context.Context. ToolExecutionConfig{Concurrency: ...} runs independent tools concurrently while preserving tool-result order.
Last modified on October 18, 2026