Bedrock AgentCore >=1.6.3 + A2A v1.0 is throwing error No module named 'a2a.server.apps'

[amtuanand]

Describe the bug
The A2A protocol hit v1.0.0 recently (March 2026) and introduced breaking changes into the API but it seems bedrock-agentcore still leverages a2a-sdk 0.3.0 API calls.

When starting the a2a server leveraging the bedrock_agentcore.runtime.a2a serve_a2a function got this error - "An error occurred during server startup: No module named 'a2a.server.apps' " This is due to API incompatibility with new a2a-sdk v 1.0.0

To Reproduce
Create a sample A2A app leveraging bedrock-agentcore python sdk > 1.6.3 and a2a-sdk > 1.0.0 you would get the error descrobed above

Expected behavior
A2A server should start gradefully without any issue on port 9000

Screenshots
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Desktop (please complete the following information):

• OS: macOS
• Browser : Safari
• Version : latest macOS

[christianfroehlich]

I don't know if this is related, but i suspect it is - when i created a new vanilla a2a agent and run it from main.py I get a similar but different error: ImportError: cannot import name 'DataPart' from 'a2a.types'