OpenAI Open-Sources Euphony: A Browser-Based Visualization Tool for Harmony Chat Data and Codex Session Logs

OpenAI open-sourced Euphony, a browser-based tool for visualizing Harmony chat data and Codex session logs.

It automatically detects JSON/JSONL structure and renders interactive timelines, metadata panels, filters, grid views, and an editor.

Euphony also supports optional backend integration for large or remote datasets, including FastAPI-based setups.

The tool aims to make agent traces and structured conversation data easier to inspect than raw JSON debugging.