Use the Type field to determine which variant is active, then access the corresponding field:
switch messagesMessageParamContentUnion3.Type { case components.MessagesMessageParamContentUnion3TypeArrayOfAnthropicWebSearchResultBlockParam: // messagesMessageParamContentUnion3.ArrayOfAnthropicWebSearchResultBlockParam is populated case components.MessagesMessageParamContentUnion3TypeContentWebSearchToolResultError: // messagesMessageParamContentUnion3.ContentWebSearchToolResultError is populated}
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