The article explores how Pydantic's validation mechanisms can be leveraged to minimize hallucinations in language model outputs by enforcing constraints on model inputs and outputs. Validators are introduced as functions that check properties, raise errors, and return values, which can be used to ensure context-specific constraints are applied. Examples demonstrate the use of validators to enforce rules such as requiring a space in a name or removing stopwords from text. The article also discusses using language models (LLMs) to create validators for more complex rules, such as moderating content to avoid objectionable material, and emphasizes the importance of grounding responses in context to avoid incorrect citations. By using Pydantic's BaseModel and validation functions, developers can effectively manage and control model outputs, ensuring they are accurate and contextually relevant.