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Trace Every Codex Session in LangSmith in Minutes

2026-07-14 Science & Technology
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LangChain
LangChain
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Description

Amy Ru from the LangChain Product team walks through wiring up the Codex CLI so every session lands in LangSmith as a full trace, including turns, tool calls, model metadata, token usage, and nested sub-agents. She sets up the tracing plugin from the Codex marketplace, configures config.toml and environment variables, runs a real multi-step Codex task, and shows exactly what to check if traces don't show up. Chapters: 0:00 Wiring up Codex tracing in LangSmith 0:19 What you need before you start 0:28 Installing the tracing plugin from the Codex marketplace 0:52 Turning on plugin hooks in config.toml 1:15 The one flag that actually enables tracing 1:37 Setting environment variables for tracing 1:57 Running a real Codex task with tool calls 2:38 What a Codex trace looks like in LangSmith 3:09 Inspecting tool calls, shell calls, and web searches 3:18 How sub-agents show up as nested traces 3:30 What happens if you cancel a run 3:37 Fixing an empty trace screen 4:05 Recap: two config blocks, one flag 4:14 What's next: Claude Code and Cursor

Top Comments (2)

@dbaker280 2026-07-14

How much would this cost?

4
@AAA-eu8tj 2026-07-16

can i trace Claude code?

1 1 replies

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