Show HN: A open-source, local trace viewer for Claude Code and Codex sessions (github.com)

A new open-source tool called "agent-profiler" has been released, providing a local trace viewer specifically designed for tracing and debugging sessions with AI agents like Claude Code and Codex. Simple to install via NPM, this tool requires no setup beyond having Node.js, allowing developers to analyze the performance of their agent-based applications directly from their local environment. The profiler aims to address common issues such as context bloat, where excessive or insufficient tokens affect the performance of AI agents, helping developers pinpoint performance bottlenecks with detailed insights. The significance of agent-profiler lies in its tailored approach to profiling coding agents, distinguishing it from generic LLM observability tools that may overlook critical nuances in a local development context. By operating entirely on local machines without telemetry or data uploads, it ensures privacy and control over development processes. The application offers features such as a waterfall UI and support for both Claude and Codex session transcripts, equipping developers with a practical tool to enhance their debugging capabilities and improve overall agent performance.