3 articles
AI & LLMs
Artificial intelligence articles on LangChain, OpenAI GPT, prompt engineering, RAG, AI agents, and building production AI applications.
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We Turned Simulation Off and Two Bugs Showed Up in the First Five Minutes
Jul 19, 2026
A simulate flag hides real path bugs by construction. What broke the day we ran live checkout for real, why we moved from a global mock to role based simulation, and the two envelope rules that keep a recovery from painting a good result red.
LLMAI AgentsReliabilitySelf Healing -
No Object Generated: Response Did Not Match Schema
Jul 19, 2026
Nine unrelated features broke in one afternoon with the same error string, because generateObject asks the provider to enforce your schema and most providers quietly do not, plus the schema field that was pulling the model into hallucinating dates.
LLMVercel AI SDKZodStructured Output -
Self Preference Bias Is a 5 to 15 Point Swing, So Our Judge Is a Different Model Family
Jul 19, 2026
Testing an agent whose output changes every run: deterministic structural assertions for the objective half, a cross family LLM judge for the rest, rubrics written as falsifiable claims, and a harness that admits what it did not grade.
LLMEvalsTestingAI Engineering