AI SDK v4.1.12 introduces a breaking change for Morphic with multiple tool steps

[bass3l]

Currently, Morphic assumes that they are are two subsequent assistant messages, one contains the tool call or result and the second contains the LLM response.

AI SDK introduced a change with version v4.1.12 that merges the two messages into one with vercel/ai#4591 resulting in Morphic only showing the search tool result and no answer or related questions.

[nauxliu]

I also noticed that when there are multiple tool calls in the same assistant message, it seems to mix up the message‐tool sequence. In other words, I’m seeing that subsequent tool calls can get appended out of order, making the final assistant message’s flow confusing. It’s especially noticeable in scenarios with more than one tool call. It would be great that each tool call is appended in the correct order and that no steps are reordered unexpectedly.

Before:

After