A hands-on account of using Claude Sonnet (via an AI coding IDE) to migrate a Python blogging system to Rust. The author shares three key lessons: you must know both source and target languages well to catch subtle issues the AI misses; expect significant iteration through prompt-generate-test cycles; and take full responsibility for every line of generated code. Notable failures included Claude omitting authentication checks on nearly all admin routes, producing garbled output mid-session, and inconsistently applying shell syntax. The conclusion is that AI coding tools can accelerate migration work but cannot substitute for developer expertise in both languages.
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