When the question is "Can I be sued for..." there can't ever be a really useful answer, because anyone can be sued for just about anything. The suit may be tossed as pointless early in the process, but it can be filed.
That said, could there be a valid ground of suit against a developer for creating a scraper? Possibly.
Scraping a site could be against the site's TOS. It could be largely a way of committing copyright infringement. It could be unlawful in some other way. For most sites, scraping is not unlawful. Google does it all the time.
If there is no legitimate use for the scraper, or very nearly none, so that any user is likely to be acting maliciously and unlawfully, and if the developer knows this, or any reasonable developer should know this, then the developer could possibly be found liable for the illegitimate actions of those who use the scarper.
If there is a legit use for the scraper, or the developer would plausibly think that there is, then such development is not illegal, and a successful suit against the developer is unlikely.