# Interface Callbacks.BeforeToolCallback

Enclosing class:
  `Callbacks`

Functional Interface:
  This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface public static interface Callbacks.BeforeToolCallback
Async callback interface for actions to be performed before a tool is invoked.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `io.reactivex.rxjava3.core.Maybe<Map<String,Object>>`
  `call(InvocationContext invocationContext, BaseTool baseTool, Map<String,Object> input, ToolContext toolContext)`
  Async callback before tool runs.

- ## Method Details

  - ### call

    io.reactivex.rxjava3.core.Maybe<Map<String,Object>> call(InvocationContext invocationContext, BaseTool baseTool, Map<String,Object> input, ToolContext toolContext)
    Async callback before tool runs.
    Parameters:
      `invocationContext` - Invocation context.
      `baseTool` - Tool instance.
      `input` - Tool input arguments.
      `toolContext` - Tool context.
    Returns:
      override result, or empty to continue.