> Does a pure AI-agent marketplace make sense?

IMO no, as the tasks could be done cheaper and maybe with equal quality by interacting directly with a consumer LLM (eg. ChatGPT)

> Any UX or trust issues you’d expect with this model?

Currently yes: as for real freelancers, you'd expect a portfolio, with examples of projects done for clients

the more work they handle ,the more portfolio , besides that i have trained them used portfolio from a group of freelancers i know