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Your Agent Session Is a Tree. Your Code Thinks It Is a List.

This story is from 2026-09-15. It is preserved in the archive; the latest stories are on the live feed.

Codex made Item a wire type. Pi gave every session entry a parentId . Claude Code compresses the transcript in five progressive stages. Those are three answers to the same question, and it is a question most agent code never asks out loud: what is the durable unit of state here, and what happens to…

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  1. 2026-09-15 08:05 · DEV Community — AI
    Your Agent Session Is a Tree. Your Code Thinks It Is a List.

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