Reverse-engineering the undocumented session logs of Claude Code, Codex and Mistral Vibe

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Claude Code, Codex and Mistral Vibe write every action to disk as it happens, but none publishes the format of those files. The author, who builds the open-source tool Agent Standup, reads these logs to show which agents are active, waiting, or prompting for input. The article explains where each tool stores sessions, which record types matter, and how sub-agent transcripts are organized. It warns that token usage is repeated per content block, so messages must be counted once by ID, and that sub-agent reports may arrive through tool calls rather than text. The formats were checked against sessions from October 2026 and may change without notice.

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