# What does this PR do?
closes#3268closes#3498
When resuming from previous response ID, currently we attempt to convert
from the stored responses input to chat completion messages, which is
not always possible, e.g. for tool calls where some data is lost once
converted from chat completion message to repsonses input format.
This PR stores the chat completion messages that correspond to the
_last_ call to chat completion, which is sufficient to be resumed from
in the next responses API call, where we load these saved messages and
skip conversion entirely.
Separate issue to optimize storage:
https://github.com/llamastack/llama-stack/issues/3646
## Test Plan
existing CI tests
cf422da825