wavetermdev/waveterm · error

APIType must be '%s', got '%s'

Error message

APIType must be '%s', got '%s'

What it means

ConvertAIChatToUIChat only converts chats whose native format is the Anthropic Messages API. The guard verifies aiChat.APIType equals uctypes.APIType_AnthropicMessages; passing a chat produced by another provider (OpenAI, Google, etc.) is rejected with the expected and actual API types.

Source

Thrown at pkg/aiusechat/anthropic/anthropic-convertmessage.go:817

		contentBlocks = append(contentBlocks, anthropicMessageContentBlock{
			Type:      "tool_result",
			ToolUseID: result.ToolUseID,
			Content:   content,
			IsError:   isError,
		})
	}

	return &anthropicChatMessage{
		MessageId: uuid.New().String(),
		Role:      "user",
		Content:   contentBlocks,
	}, nil
}

// ConvertAIChatToUIChat converts an AIChat to a UIChat for Anthropic
func ConvertAIChatToUIChat(aiChat uctypes.AIChat) (*uctypes.UIChat, error) {
	if aiChat.APIType != uctypes.APIType_AnthropicMessages {
		return nil, fmt.Errorf("APIType must be '%s', got '%s'", uctypes.APIType_AnthropicMessages, aiChat.APIType)
	}

	uiMessages := make([]uctypes.UIMessage, 0, len(aiChat.NativeMessages))

	for i, nativeMsg := range aiChat.NativeMessages {
		anthropicMsg, ok := nativeMsg.(*anthropicChatMessage)
		if !ok {
			return nil, fmt.Errorf("message %d: expected *anthropicChatMessage, got %T", i, nativeMsg)
		}

		uiMsg := anthropicMsg.ConvertToUIMessage()
		if uiMsg != nil {
			uiMessages = append(uiMessages, *uiMsg)
		}
	}

	return &uctypes.UIChat{
		ChatId:     aiChat.ChatId,

View on GitHub (pinned to a4447c1563)

Solutions

1. Ensure the chat was produced by the Anthropic converter and APIType is APIType_AnthropicMessages
2. Check APIType before calling and route to the matching provider's ConvertAIChatToUIChat
3. Fix the code path that sets APIType when constructing the AIChat

Example fix

// before
uiChat, err := anthropic.ConvertAIChatToUIChat(aiChat) // APIType=openai
// after
if aiChat.APIType == uctypes.APIType_AnthropicMessages {
    uiChat, err = anthropic.ConvertAIChatToUIChat(aiChat)
} else {
    uiChat, err = openai.ConvertAIChatToUIChat(aiChat)
}

if aiChat.APIType != uctypes.APIType_AnthropicMessages {
    return fmt.Errorf("wrong converter for APIType %s", aiChat.APIType)
}

func isAnthropicChat(c uctypes.AIChat) bool {
    return c.APIType == uctypes.APIType_AnthropicMessages
}

if !isAnthropicChat(aiChat) {
    return nil, fmt.Errorf("route %s chats to their provider converter", aiChat.APIType)
}
uiChat, err := anthropic.ConvertAIChatToUIChat(aiChat)

When it happens

Trigger: Calling ConvertAIChatToUIChat with an AIChat whose APIType field is anything other than APIType_AnthropicMessages — e.g. a chat built by an OpenAI converter.

Common situations: Mixing provider chat objects after refactoring, storing chats in a shared cache without the APIType, or routing the wrong chat to the Anthropic UI converter.

Related errors

• convertFileUIMessagePart expects 'file' type, got '%s'
• unsupported URL protocol in file part: %s
• failed to decode base64 data: %w
• dropping text/plain file with URL (must be fetched and conve
• dropping file with unsupported media type '%s' (must be uplo

AI-assisted analysis of wavetermdev/waveterm@a4447c1563 (2026-09-01). Data as JSON: /api/errors/15d9645b77db6d7c. Report an issue: GitHub.