Module error 

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

AdkError

Unified structured error type for all ADK-Rust operations.

ErrorDetails

Optional structured metadata carried by an AdkError.

RetryHint

Structured retry guidance attached to every AdkError.

Enums

ErrorCategory

The kind of failure independent of subsystem.

ErrorComponent

The subsystem that produced the error — the origin, not the boundary it surfaces through.

Type Aliases

Result

Convenience alias used throughout ADK crates.