Enable prompt caching in create_react_agent

[chnsh]

Could we please enable prompt caching in create_react_agent in the messages that go through the agent node?
I implemented this at the input to the agent but internally, we don't have the same control
langchain-ai/langchain#25610 (comment)

[AlcebiadesFilho]

some progress
?

[georgezouq]

looking for it

[arvindsg]

This is a must have feature for any serious agent development effort.

[eyurtsev]

Apologies, we'll add this to the documentation.

This has been possible with create react agent for a while as you can define a custom prompt (i.e., all the messages into the model).

You'll need to look up the format of the cache control for the specific model you're using (e.g., anthropic and openai use slightly different syntax).