r/AI_Agents: Developer Publishes 30-Day Lessons from Letting an AI Agent Manage a Live Micro-Portfolio

A developer on r/AI_Agents ran a 30-day experiment giving a multi-agent system read-write access to a $500 live brokerage account, publishing every trade decision and failure mode in a detailed post with raw decision logs and code. Key findings include that the agent over-traded aggressively during low-signal periods—destroying alpha through transaction costs—and failed to recognize when its own prior positions had altered the risk calculus for new trades. The post provides a practical dataset of agentic failure modes in financial contexts, drawing attention from both the agent-building and fintech communities.