[Prevent logging of sensitive data in traces | 🦜️🛠️ LangSmith](https://docs.smith.langchain.com/observability/how_to_guides/mask_inputs_outputs): LLM should read this page when: 1) Needing to prevent sensitive data from being logged in application traces 2) Requiring customization of input/output masking for specific functions Explains how to hide inputs and outputs entirely, use regex patterns or third-party services for rule-based masking, and process inputs/outputs for individual traced functions.

