When multiple agents communicate via the A2A protocol, the invocationContext.session.state is not transformed and transmitted to the message, and SSE streaming is not supported.
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Since Feb 24, 2026.
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Description
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1.Based on the following source code reading, in the logic of converting invocationContext to Message using EventConverter.convertEventsToA2AMessage:
Optional<Message> a2aMessageOpt = com.google.adk.a2a.EventConverter.convertEventsToA2AMessage(invocationContext);
metadata is not assigned. Therefore, will the following code always return a null case:
Map<String, Object> metadata = originalMessage.getMetadata() == null ? Map.of() : originalMessage.getMetadata();
Is it possible to convert invocationContext.session.state to the metadata of the Message, as additional information in the communication protocol between the client agent and the server agent? like this：
Due to the time-consuming nature of this communication, which negatively impacts user experience, it is recommended to replace the synchronous approach with SSE streaming output. Simultaneously, the client should use a pre-implemented streaming HTTP request to establish connections.
Describe the Solution You'd Like
Some of the solution code logic is above.
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