The widespread adoption of large language models (LLMs) in applications and product integrations necessitates reliable and structured outputs. However, LLMs can exhibit unpredictable behavior and generate undesired outputs, requiring additional safeguards to ensure more predictable outputs and minimize hallucinations. While prompt engineering efforts have been made to reduce the likelihood of unexpected outcomes, the success rate leaves room for further exploration. This talk explores techniques and guardrails to obtain structured output, validate LLM results, implement caching to reduce latency and costs, and handle errors. Additionally, it explores the use of popular Python packages such as Pydantic in guiding the outputs of LLMs and achieving structured outputs where prompting fails.