Looking for agents that can be called via API

I am working on a project where I need to create an agentic pipeline to research topics and write articles. OpenAI DeepResearch works well for a single article, but I would like a more programmatic and pipeline approach where I can automate the creation of an entire library of content fairly quickly leveraging the diligence of an agentic approach.

Can anyone provide any tips for this approach? I somehow think that trying to engineer my own agent isn't necessarily the best idea as the tech is changing so fast and I am afraid of overengineering a short term solution.

Thanks!