Case Study: Freeze the Error Taxonomy Before an Agent Writes the Error Mapper
Six slightly different 4xx answers for the same failure is exactly what you get when an agent writes your error mapper without a frozen taxonomy. Fixing it costs one contract file, one hash check, and a test that runs in under a second. This case study walks a small project end to end: four known failure modes, one generated mapper, and the freeze step that keeps the generator honest. Treat the…
Six distinct HTTP 4xx responses for the same underlying failure are the result of an agent creating an error mapper without a stable taxonomy. Correcting this issue requires just one contract file, a hash check, and a test that runs quickly. This case study follows a small project from start to finish, covering four known failure modes, a generated mapper, and the crucial step of freezing the taxonomy to maintain its integrity.
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