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

MarkTechPost / 4/22/2026

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OpenAI has open-sourced Euphony, a browser-based visualization tool aimed at making it easier to debug multi-step AI agent runs.
The tool focuses on visualizing Harmony Chat data and Codex session logs, helping developers understand agent actions such as file reading, API calls, code writing, and iterative output revisions.
Debugging long-running agents is described as fundamentally different from conventional debugging because there is often no single stack trace to follow.
By replacing raw JSON inspection with structured visualization, Euphony helps developers reconstruct what a model did across many steps.

Debugging an AI agent that runs for dozens of steps: reading files, calling APIs, writing code, and revising its own output, is not like debugging a regular function. There is no single stack trace to read. Instead, developers are left staring at hundreds of lines of raw JSON, trying to reconstruct what the model was […]

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