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Migrating a Spaghetti Agent Codebase to LangGraph (ANSWERED)

Project BasedLangGraphMedium14 min read

**Discovery** Instrument legacy script to log state snapshots; draw FSM on whiteboard; identify hidden globals.

TL;DR — Quick Answer

Map implicit states to explicit schema; extract nodes incrementally; start with parity tests on recorded sessions; run shadow mode; replace loops with conditional edges; add checkpointing last mile for prod gains.

The Interview Question

Your team has a 2k-line Python agent script with nested if/else and while loops. Plan migration to LangGraph.

Deep Explanation

Discovery Instrument legacy script to log state snapshots; draw FSM on whiteboard; identify hidden globals.

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LangGraph vs LangChain Agents vs Custom FSM: Choosing the Right Abstraction (ANSWERED)

**LangChain agents** Higher-level executors (ReAct, tool calling) with less boilerplate. Good for demos and simple loops. Harder to debug complex branching, human interrupts, and precise persistence semantics.

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