Fix NullPointerException in McpToolUtils.toAsyncToolSpecification

The SyncToolSpecification constructor was being called with null for the
call parameter, causing NPE when async version called call().apply().
Fixed by providing proper lambda that wraps Map arguments in CallToolRequest.

Signed-off-by: mark.pollack@broadcom.com

Author: markpollack

mcp/common/src/main/java/org/springframework/ai/mcp/McpToolUtils.java

@@ -165,7 +165,9 @@ public static McpServerFeatures.SyncToolSpecification toSyncToolSpecification(To
 
 		SharedSyncToolSpecification sharedSpec = toSharedSyncToolSpecification(toolCallback, mimeType);
 
-		return new McpServerFeatures.SyncToolSpecification(sharedSpec.tool(), null,
+		return new McpServerFeatures.SyncToolSpecification(sharedSpec.tool(),
+				(exchange, map) -> sharedSpec.sharedHandler()
+					.apply(exchange, new CallToolRequest(sharedSpec.tool().name(), map)),
 				(exchange, request) -> sharedSpec.sharedHandler().apply(exchange, request));
 	}