Bridging the Gap: How to Transform Legacy Closed Source .NET DLLs into AI Agent Tools
Qiita AI•Apr 20, 2026 01:11•infrastructure▸▾
infrastructure#agent📝 Blog|Analyzed: Apr 20, 2026 01:14•
Published: Apr 20, 2026 01:11
•1 min read
•Qiita AIAnalysis
This article presents a brilliantly practical approach to integrating legacy software with modern AI systems by decompiling Closed Source .NET DLLs. By transforming these legacy binaries into functional specifications, the author has unlocked a highly efficient pathway for Agent creation. It is an incredibly innovative solution that directly addresses a common, real-world enterprise challenge when original source code is lost or unavailable.
Key Takeaways & Reference▶
- •Legacy .NET DLLs without source code can be reverse-engineered into specifications using Open Source tools like ilspycmd.
- •The methodology applies smart filtering to isolate business logic (like DataAccess/Service classes) while ignoring UI helpers and properties to prevent confusing the Agent.
- •The system defaults to generating safe, read-only operations (Select/Get methods), requiring explicit instructions to generate any update-based actions.
Reference / Citation
View Original"The idea this time is: since there is no source code, we will make the DLL itself into the specification document... We proceeded with the policy that decompilation results become the specification for AI."