Source record

Published by LangChain Blog (T1.5 source). The original is at https://www.langchain.com/blog/your-coding-agents-are-a-black-box-heres-how-to-crack-them-open.

Pipeline notes

The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.

LangChain blog post promoting LangSmith tracing for coding agents across Claude Code, Codex, Cursor, and Copilot. The author recounts a debugging anecdote where a subagent was handed a deprecated offset-pagination helper instead of a cursor-based one, a problem visible only via trace inspection.

The subagent-handoff debugging anecdote is a concrete failure mode, but the post is a product plug for LangSmith with little on how to act on traces yourself.

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