The state machine your agent runtime is missing: session state as first-class infrastructure

Short summary

Agent runtimes lack session state infrastructure, forcing users to become retry protocols when tool calls fail or context overflows. The solution: implement typed state structures, commit logs, and diff inspection so agent behavior becomes auditable and failures become engineering problems, not human debugging. A minimum viable version is implementable today with any framework.

• •Agent runtimes have no session state protocol—model doesn't know when tool calls fail or context overflows
• •Propose three-part solution: typed state schema, commit log, and diff inspection between turns
• •Actionable today: minimum viable version needs only state commit log, diff view, and query endpoint

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