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CodexBar is a free, open-source macOS menu bar app that tracks usage, credits, and reset countdowns across 29 AI coding providers, helping developers manage API costs.
A developer built a real-time 3D visualization dashboard for monitoring AI agent working memory after losing $400+ to runaway agent loops, using color-coded nodes and edges to detect reasoning loops before they become costly. The post reflects on agent observability as an emerging category distinct from traditional microservice monitoring.