IArt.
What doesn't work
Your core function is a feature, not a company. You are describing a slightly better search query flow, which existing giants like Google or OpenAI can replicate trivially. There is no proprietary technology, no unique data, and no network effect here.
IIArt.
Biggest risk
The biggest risk is irrelevance. Your agent will be obsolete the moment Google tweaks its search algorithm or ChatGPT adds a 'troubleshooting mode'. You're competing with companies that own the entire information landscape.
IIIArt.
Key question
Why would anyone use your specific tool instead of the powerful, general-purpose AI they already have open in another tab?