A2A Agents don't seem to support streaming via "agentcore invoke"

[saitarun-ent]

Description

Not sure if this is supposed to be a bug or intended behavior.

This document (https://a2a-protocol.org/latest/topics/streaming-and-async/) suggests streaming may be supported by A2A servers (agentcore runtimes in our case). It seems that is not the case as of v0.25. Are there plans to support it (like with HTTP agents)?

Steps to Reproduce

1. Run "agentcore add"
2. Create a HTTP and an A2A agent.
3. Run "agentcore deploy"
4. Run "agentcore invoke --runtime --stream" on each

Expected Behavior

Both the HTTP agent and the A2A agent should stream the result.

Actual Behavior

Only the HTTP agent does so. A2A sends the entire response at once.

CLI Version

0.25.0

Operating System

macOS

Additional Context

No response