plandex-ai/plandex · error

No planName tag found in XML response

Error message

No planName tag found in XML response

What it means

GenPlanName requested XML output (PreferredOutputFormat == xml) but the model's returned content did not contain a parseable <planName> element, so utils.GetXMLContent returned an empty string. The library fails fast rather than returning an empty plan name. The model responded, but not in the expected structured shape.

Source

Thrown at app/server/model/name.go:95

		Messages:      messages,
		Tools:         tools,
		ToolChoice:    toolChoice,
		SessionId:     sessionId,
		Settings:      settings,
	})

	if err != nil {
		fmt.Printf("Error during plan name model call: %v\n", err)
		return "", err
	}

	var planName string
	content := modelRes.Content

	if baseModelConfig.PreferredOutputFormat == shared.ModelOutputFormatXml {
		planName = utils.GetXMLContent(content, "planName")
		if planName == "" {
			return "", fmt.Errorf("No planName tag found in XML response")
		}
	} else {
		if content == "" {
			fmt.Println("no namePlan function call found in response")
			return "", fmt.Errorf("No namePlan function call found in response. The model failed to generate a valid response.")
		}

		var nameRes prompts.PlanNameRes
		err = json.Unmarshal([]byte(content), &nameRes)
		if err != nil {
			fmt.Printf("Error unmarshalling plan description response: %v\n", err)
			return "", err
		}
		planName = nameRes.PlanName
	}

	return planName, nil
}

View on GitHub (pinned to e2d772072e)

Solutions

1. Retry the request; nondeterministic models often emit valid XML on retry
2. Strengthen the prompt with an explicit XML schema example for planName
3. Use a model known to follow structured output / the provider's native JSON mode
4. Preprocess content to strip markdown fences before GetXMLContent
5. Fall back to the non-XML branch (function-call content) or a default name if parsing fails

Example fix

// before
planName := utils.GetXMLContent(content, "planName")
if planName == "" { return "", fmt.Errorf("No planName tag found in XML response") }
// after: strip fences then retry once
cleaned := strings.TrimSpace(strings.Trim(content, "` \n"))
planName := utils.GetXMLContent(cleaned, "planName")
if planName == "" { planName = fallbackPlanName() }

// request structured output explicitly and verify shape before parsing
if baseModelConfig.PreferredOutputFormat == shared.ModelOutputFormatXml &&
    !strings.Contains(modelRes.Content, "<planName>") {
    // retry or switch to non-XML extraction path before failing
}

func hasPlanNameTag(content string) bool {
    return strings.Contains(content, "<planName>") && strings.Contains(content, "</planName>")
}

name, err := GenPlanName(ctx, ...)
if err != nil && strings.Contains(err.Error(), "No planName tag found") {
    name = retryOrExtractFallback(modelRes.Content) // e.g. regex or default name
}

When it happens

Trigger: Model output format is XML and GetXMLContent(content, "planName") yields "": model omitted the tag, used different tag casing/nesting, wrapped XML in markdown fences, or produced prose instead of XML.

Common situations: Weak models ignoring the XML schema instruction; prompt changes dropping the schema example; providers adding code fences around XML; truncation cutting off the closing tag; switching to a model that follows structured output poorly.

Related errors

• no whole file found in response
• old content does not have a line number prefix for first lin
• error extracting line number from first line: %v
• error extracting line number from last line: %v
• error unmarshalling JSON file: %v

AI-assisted analysis of plandex-ai/plandex@e2d772072e (2026-09-05). Data as JSON: /api/errors/6b813b3d6f733379. Report an issue: GitHub.