'Graph Engineering' Replaces 'Loop Engineering' as the Agent-Architecture Meme — Anthropic Engineer's 12-Page PDF Goes Wide

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A senior Anthropic engineer published a 12-page treatment of "Graph Engineering" for multi-agent systems, and it spread fast (475 likes / 53K views on one thread, 350 likes / 76K on another). The core claim: your agent's memory dies with its context window, and an explicit graph — heterogeneous nodes for agents, deterministic functions, routers, joins, tools, and human checkpoints, with delegation as edges — makes state permanent and the topology governable. This is a direct successor to the 11-page "Loop Engineering" PDF that circulated weeks earlier; Turing Post is already running a "Is Graph Engineering Real?" skeptic piece, so treat the framing as contested.