How to

📄️ RunnableParallel: Manipulating data

manipulating-inputs-output}

📄️ RunnablePassthrough: Passing data through

passing-data-through}

📄️ RunnableLambda: Run Custom Functions

run-custom-functions}

📄️ RunnableBranch: Dynamically route logic based on input

dynamically-route-logic-based-on-input}

📄️ Bind runtime args

Sometimes we want to invoke a Runnable within a Runnable sequence with

📄️ Configure chain internals at runtime

Oftentimes you may want to experiment with, or even expose to the end

📄️ Create a runnable with the `@chain` decorator

You can also turn an arbitrary function into a chain by adding a

📄️ Add fallbacks

There are many possible points of failure in an LLM application, whether

📄️ Stream custom generator functions

You can use generator functions (ie. functions that use the yield

📄️ Inspect your runnables

Once you create a runnable with LCEL, you may often want to inspect it

📄️ Add message history (memory)

The RunnableWithMessageHistory let us add message history to certain