Crate ra2a 

A2A Rust SDK

A Rust implementation of the Agent2Agent (A2A) Protocol v1.0.

This crate provides a complete implementation of the A2A protocol for building agentic applications that can communicate with each other.

Features

• A2A Protocol v1.0 Compliant: Full implementation of the latest specification
• Async/Await: Built on tokio for high-performance async operations
• Type-Safe: Strongly typed models with newtype IDs and serde serialization
• Extensible: Modular design with optional features (gRPC, telemetry, SQL)

Re-exports

pub use error::A2AError;

pub use error::Result;

pub use types::AgentCapabilities;

pub use types::AgentCard;

pub use types::AgentInterface;

pub use types::AgentSkill;

pub use types::Artifact;

pub use types::ArtifactId;

pub use types::ContextId;

pub use types::ListTasksRequest;

pub use types::ListTasksResponse;

pub use types::Message;

pub use types::MessageId;

pub use types::Metadata;

pub use types::Part;

pub use types::PartContent;

pub use types::PushNotificationConfig;

pub use types::Role;

pub use types::SendMessageConfiguration;

pub use types::SendMessageRequest;

pub use types::SendMessageResponse;

pub use types::StreamResponse;

pub use types::Task;

pub use types::TaskArtifactUpdateEvent;

pub use types::TaskId;

pub use types::TaskState;

pub use types::TaskStatus;

pub use types::TaskStatusUpdateEvent;

pub use types::TransportProtocol;

Modules

clientclient

A2A client module.

error

Error types for the A2A SDK.

serverserver

A2A Server module.

types

A2A Protocol v1.0 types and data models.

Constants

PROTOCOL_VERSION

Protocol version supported by this SDK.

SDK_VERSION

SDK version.

SVC_PARAM_EXTENSIONS

The service parameter key for A2A extensions.

SVC_PARAM_VERSION

The service parameter key for the A2A protocol version.

WELL_KNOWN_AGENT_CARD_PATH

Well-known path for the public agent card endpoint.

Functions

agent_card_url

Constructs the full agent card URL from a base URL.