Building in Public an Autonomous Marketing Agent with SerpApi, LangGraph, and LangSmith inside Reddit to promote my GitHub Project. Most "AI agent" tutorials show you a ReAct loop that calls tools until the LLM decides it's done. That works for demos. It breaks in production. I built an autonomous PR / Mkt agent called Doug that discovers relevant Reddit threads via SerpApi, drafts contextual comments, and post them on a schedule, all without human intervention. It runs on GitHub Actions, traces every decision in LangSmith, and has been operating in production for 2 weeks now. Here's how I designed it to actually work till the point of "drafting the response for the Reddit Thread".…