Show HN: Trace.taxi – easy agent messages visualization

this is an alternative to langfuse and mlflow for visualizing your agent traces. It has no sign up, no hosting and all data stays on your laptop.

I was working with benchmarking agents using terminal-bench, and I often found myself with a bunch of messages json that I needed to read. Combined with MCP calls and base64 images, these things can get quite hairy.

So I build a visualizer, inspired by ampcode, that neatly parses eveything and displays it in your browser for quick debugging. It's open source and serverless, so you can run it as you please.

I tested mostly with my own logs from ~/.claude/projects/, so it's possible you'll be able to break it. Let me know if you do!