Tech Ocean

Apr 25, 2026 · Artificial Intelligence

Day 3 of LangGraph 14‑Day Series: Enabling GPT to Call External APIs with ToolNode

This article walks through LangGraph's three‑step tool‑calling workflow, shows how to define tools with the @tool decorator, demonstrates executing calls via ToolNode, provides a complete agent example, explains bind_tools, shares best‑practice guidelines, streaming execution, and a concise recap.