github.com• Mar 8, 2026• 1 min read
Show HN: Promptinel – A Security Scanner for PromptsHello HN :)Promptinel is a security scanner for prompts. I think the world needs something like this, because prompts are basically executable artifacts and we need to treat them as such. I want to identify as many bad things as I can before a prompt gets anywhere near runtime. Especially when supplying a common prompt repository for friends or colleagues, or when downloading skills from the internet. You can read more about my motivation in the project's readme: https://github.com/CunningFatalist/promptinel?tab=readme-ov-...Promptinel finds various attack patterns in prompts, for example:- prompt override and role spoofing patterns- download-and-execute chains- template execution and network fetch behavior- secret exfiltration intent- invisible Unicode and obfuscation tricks- local sensitive file referencesCheck out the rule documentation for more: https://github.com/CunningFatalist/promptinel/blob/main/docs...I'm really looking forward to feedback from people, who have built linters