Pi Core Engine Rewrite Plan: Moving from Prototype to Production-Grade

hsu_byron · x · 2026-08-11

The post shares the core design philosophy behind the Pi core engine rewrite (Harness v2). Moving beyond a functional prototype, v2 aims to be a production-grade, highly durable system.

A major architectural upgrade is the complete overhaul of Session management. Abandoning the previous monolithic JSONL format, v2 splits sessions into four independently persisted layers:

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