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Apr 25, 2026 · Artificial Intelligence

Analyzing the 2026 ReAct Agent Architecture: Native Tool Calling and LangGraph State Machine

This article walks through building a production‑ready ReAct loop in 2026, replacing fragile string‑based tool parsing with native JSON tool calls, persisting state via LangGraph and Postgres, structuring evidence collection, handling errors, and addressing loop‑termination and cost‑control challenges.