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!