Crate ra2a_ext 

ra2a-ext

Extension utilities for the A2A Rust SDK.

This crate provides CallInterceptor and server-side CallInterceptor implementations for activating and propagating A2A protocol extensions across agent chains.

Aligned with Go’s a2aext package.

Components

• ExtensionActivator — Client interceptor that requests extension activation on outgoing calls, filtering by server-supported extensions.
• ServerPropagator — Server interceptor that extracts extension-related metadata and headers from incoming requests for downstream propagation.
• ClientPropagator — Client interceptor that injects propagated extension data into outgoing requests (for agent-to-agent chaining: A → B → C).

Usage

use ra2a_ext::ExtensionActivator;
// Attach to a client to auto-request extensions on every call:
let activator = ExtensionActivator::new(vec![
    "urn:a2a:ext:duration".into(),
]);

Structs

ClientPropagator

Client-side CallInterceptor that injects propagated extension data into outgoing requests.

ClientPropagatorConfig

Configuration for ClientPropagator.

ExtensionActivator

Client-side CallInterceptor that requests extension activation.

PropagatorContext

Extension data extracted by ServerPropagator for downstream propagation.

ServerPropagator

Server-side CallInterceptor that extracts extension-related metadata and headers from incoming requests.

ServerPropagatorConfig

Configuration for ServerPropagator.

Functions

init_propagation

Wraps a future with an empty propagation scope.