[How to: pass runtime secrets to a runnable](https://python.langchain.com/docs/how_to/runnable_runtime_secrets): LLM should read this page when needing to pass sensitive data to a runnable, ensuring secrets remain hidden from tracing, or integrating secret values with runnables. Explains how to pass runtime secrets to runnables using RunnableConfig, allowing certain keys to be hidden from tracing while still being accessible during invocation.

