Metadata Loss in AdvisedRequest.toPrompt() (Spring AI v1.0.0-M6)

[miimnoon]

Dear Spring AI Team,
I am reaching out to report an issue in Spring AI v1.0.0-M6 related to metadata loss when calling AdvisedRequest.toPrompt() inside an advisor method.

🔹 Problem Description:
When retrieving the Prompt from AdvisedRequest using request.toPrompt(), a new message object is created, causing all previously set metadata (conversationId, userId, etc.) to be lost.

🔹 Steps to Reproduce:
Setting Metadata in UserMessage

java
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Map<String, Object> metadata = new HashMap<>();
metadata.put("conversationId", conversationId);
metadata.put("userId", userId);

UserMessage userMessage = new UserMessage(userQuery, Collections.emptyList(), metadata);

String answer = chatClient.prompt()
.messages(List.of(userMessage))
.options(options)
.call()
.content();
Retrieving Metadata in Advisor (aroundCall method)

java
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@OverRide
public AdvisedResponse aroundCall(AdvisedRequest request, CallAroundAdvisorChain chain) {
Prompt prompt = request.toPrompt(); // This creates a new message object

// Attempt to retrieve metadata
Message lastMessage = prompt.getMessages().get(prompt.getMessages().size() - 1);

if (lastMessage instanceof UserMessage userMessage) {
    logger.debug("Message metadata: {}", userMessage.getMetadata()); // ❌ Always null
}

return chain.nextAroundCall(request);

}
🔹 Expected Behavior:
UserMessage metadata should persist when calling request.toPrompt().
The metadata set in UserMessage should be retrievable in the advisor.
🔹 Actual Behavior:
request.toPrompt() creates a new message object, losing all metadata.
When retrieving UserMessage from prompt.getMessages(), getMetadata() always returns null.
🔹 Environment:
Spring AI Version: 1.0.0-M6