Crate ra2a 

A2A Rust SDK

A Rust implementation of the Agent2Agent (A2A) Protocol SDK.

This crate provides a complete implementation of the A2A protocol for building agentic applications that can communicate with each other following the Agent2Agent Protocol.

Features

• A2A Protocol Compliant: Full implementation of the A2A specification
• Async/Await: Built on tokio for high-performance async operations
• Type-Safe: Strongly typed models with serde serialization
• Extensible: Modular design with optional features

Re-exports

pub use error::A2AError;

pub use error::Result;

pub use types::AgentCapabilities;

pub use types::AgentCard;

pub use types::AgentSkill;

pub use types::Artifact;

pub use types::Event;

pub use types::Message;

pub use types::MessageSendParams;

pub use types::Metadata;

pub use types::Part;

pub use types::PushConfig;

pub use types::Role;

pub use types::SendMessageResult;

pub use types::Task;

pub use types::TaskArtifactUpdateEvent;

pub use types::TaskIdParams;

pub use types::TaskPushConfig;

pub use types::TaskQueryParams;

pub use types::TaskState;

pub use types::TaskStatus;

pub use types::TaskStatusUpdateEvent;

pub use types::TaskVersion;

Modules

clientclient

A2A client module.

error

Error types for the A2A SDK.

serverserver

A2A Server module.

types

A2A Protocol types and data models.

Constants

EXTENSIONS_META_KEY

The metadata key for A2A extensions passed in request/response headers.

PROTOCOL_VERSION

Protocol version supported by this SDK.

SDK_VERSION

SDK version

WELL_KNOWN_AGENT_CARD_PATH

Well-known path for the public agent card endpoint (aligned with Go’s WellKnownAgentCardPath).

Functions

agent_card_url

Constructs the full agent card URL from a base URL.