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Supported Types

messagesMessageParamContentUnion3 := components.CreateMessagesMessageParamContentUnion3ArrayOfAnthropicWebSearchResultBlockParam([]components.AnthropicWebSearchResultBlockParam{/* values here */})

ContentWebSearchToolResultError

messagesMessageParamContentUnion3 := components.CreateMessagesMessageParamContentUnion3ContentWebSearchToolResultError(components.ContentWebSearchToolResultError{/* values here */})

Union Discrimination

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
}