Agent Monitor: Dashboard for Codex Subagents, Tokens and Cost

Melvin Vivas · X post · 2026-09-16 · Open on X

Topics: LLMOps, Deployment & Monitoring, AI Agents, Tool Use & MCP, AI Dev Tools & Productivity · Level: intermediate

Summary

Melvin Vivas released Agent Monitor on GitHub. It is a dashboard of the main Codex agent and its subagents that shows token usage and estimated cost. It is still in development but already usable, and it also supports Claude Code subagents.

Key points

• Shows a dashboard of the main Codex agent and its subagents.
• Displays token usage and estimated cost.
• The repo says it also visualizes Claude Code subagents and has an advanced traces view.
• Still in development, but you can already use it.

Resources mentioned

• donvito/agent-monitor · repo · github.com · free
  Open-source dashboard that visualizes Codex and Claude Code subagents, with a traces view, a token breakdown and estimated cost.
  Also in: Monitor Codex and Claude Code Subagents with agent-monitor (Melvin Vivas on X · notes), Agent Monitor: see traces, tokens and costs of your coding agents (Melvin Vivas on X · notes), Agent Monitor: Visualize Codex and Claude Code Subagents, Traces and Costs (Melvin Vivas on X · notes), Agent Monitor: Visualize Coding-Agent Subagents, Traces and Costs (Melvin Vivas on X · notes) and 2 more
• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more

Try this

• Install Agent Monitor from GitHub and use it to track token usage and estimated cost of your Codex subagents.
• Build an observability dashboard for your own agent's subagents that tracks tokens and estimated cost.