multica-ai/multica · error

write task_id field: %w

Error message

write task_id field: %w

What it means

Error "write task_id field: %w" thrown in multica-ai/multica.

Source

Thrown at server/internal/cli/client.go:505

// UploadChatAttachment uploads a file via multipart form to /api/upload-file
// tagged with a chat task (task_id). The server binds the row to the assistant
// reply that task produces on completion. Returns the full AttachmentResponse
// (id + markdown_url) so the agent can embed the image inline in its reply.
func (c *APIClient) UploadChatAttachment(ctx context.Context, fileData []byte, filename, taskID string) (AttachmentResponse, error) {
	var body bytes.Buffer
	writer := multipart.NewWriter(&body)

	part, err := writer.CreateFormFile("file", filepath.Base(filename))
	if err != nil {
		return AttachmentResponse{}, fmt.Errorf("create form file: %w", err)
	}
	if _, err := part.Write(fileData); err != nil {
		return AttachmentResponse{}, fmt.Errorf("write file data: %w", err)
	}
	if taskID != "" {
		if err := writer.WriteField("task_id", taskID); err != nil {
			return AttachmentResponse{}, fmt.Errorf("write task_id field: %w", err)
		}
	}
	if err := writer.Close(); err != nil {
		return AttachmentResponse{}, fmt.Errorf("close multipart writer: %w", err)
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.BaseURL+"/api/upload-file", &body)
	if err != nil {
		return AttachmentResponse{}, err
	}
	req.Header.Set("Content-Type", writer.FormDataContentType())
	c.setHeaders(req)

	// Honor a longer context deadline for large images, same as UploadFileWithURL.
	httpClient := c.HTTPClient
	if deadline, ok := ctx.Deadline(); ok {
		remaining := time.Until(deadline)
		if remaining > httpClient.Timeout {

View on GitHub (pinned to 2c0912b6ec)

Solutions

1. Retry the upload; the multipart request could not be completed.

When it happens

Trigger: Thrown at server/internal/cli/client.go:505 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of multica-ai/multica@2c0912b6ec (2026-08-15). Data as JSON: /api/errors/eb5df4e3658fb91d. Report an issue: GitHub.