Module callbacks 

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

Structs

EventsCompactionConfig

Configuration for automatic context compaction.

Enums

BeforeModelResult

Result from a BeforeModel callback

Traits

BaseEventsSummarizer

Trait for summarizing events during context compaction.

Type Aliases

AfterAgentCallback

AfterModelCallback

AfterToolCallback

AfterToolCallbackFull

Rich after-tool callback that receives the tool, arguments, and response.

BeforeAgentCallback

BeforeModelCallback

BeforeToolCallback

GlobalInstructionProvider

InstructionProvider

OnToolErrorCallback

Callback invoked when a tool execution fails (after retries are exhausted).