Type Alias ToolPredicate 

pub type ToolPredicate = Box<dyn Fn(&dyn Tool) -> bool + Send + Sync>;

Core traits and types.

Always available regardless of feature flags. Includes:

• Agent - The fundamental trait for all agents
• Tool / Toolset - For extending agents with capabilities
• Session / State - For managing conversation context
• Event - For streaming agent responses
• AdkError / Result - Unified error handling

Aliased Type

pub struct ToolPredicate(/* private fields */);