a2a-lf

Core Rust types for the A2A v1 protocol.

This crate is published as a2a-lf and imported in Rust as a2a.

What It Provides

• A2A wire-compatible message, task, artifact, and event types
• JSON-RPC request and response models
• Protocol error types and helpers
• Serde implementations aligned with the A2A protocol shape

Install

[dependencies]
a2a = { package = "a2a-lf", version = "0.2" }

Example

use a2a::{Message, Part, Role};

let message = Message::new(Role::User, vec![Part::text("hello")]);
assert_eq!(message.text(), Some("hello"));

Workspace

This crate is part of the a2a-rs workspace.

• Repository: https://github.com/a2aproject/a2a-rs
• Workspace README: https://github.com/a2aproject/a2a-rs/blob/main/README.md