Enterprise API migrations are expensive not because the target platform is hard to understand, but because the source platform is never fully documented — policies accumulate quirks, scripts embed tribal knowledge, and the only authoritative record is the running system. This document assesses the feasibility of a workbench that migrates APIs from Tibco BusinessWorks and Apigee/Apigee Edge to Mulesoft using a structured AI pipeline: RAG-backed policy matching, LLM-driven code generation, model routing, and a human-review gate. The reader will come away understanding what the system can reliably automate, where human judgment is non-negotiable, and what to build first.