Description

Would it be possible to also allow editing the stepInputMessages through prepareStep?
I am using an agent with many steps, and often it accumulates input tokens, increasing the cost greatly. (if accumulated 5K tokens and have 20 more steps, I am paying for 100K tokens for the steps.)
I hope to apply cacheControl option to one of the stepInputMessages in the middle of streamText steps to decrease the cost burden.

Thank you!

AI SDK Version

aisdk: 5.0 beta

related PR:
#5991