Legacy System Modernization with Coding Agents: A Case Study
Source
Iago da Silva Rodrigues Alves, Cristiano Politowski, Jo\~ao Eduardo Montandon
Author
Iago da Silva Rodrigues Alves, Cristiano Politowski, Jo\~ao Eduardo Montandon
Date
Terms in this piece · Glossary
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
Why it matters
Claude Code migrating a real VB6 ERP to C# .NET 10 reached 70% functional equivalence across 12 features, with results falling off sharply as feature complexity rose. A concrete baseline for what AI agentAn AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.Full definition →-led legacy modernization delivers and what it still leaves to humans.
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