docs(typescript): add callout for tool definitions when migrating from AI SDK

Author: hassiebp

pages/docs/observability/sdk/typescript/upgrade-path.mdx

@@ -80,6 +80,12 @@ Works very similarly to v3, but replaces `LangfuseExporter` from `langfuse-verce
 
 Please see [full example on usage with the AI SDK](/docs/observability/sdk/typescript/instrumentation#vercel-ai-sdk) for more details.
 
+<Callout>
+
+Please note that provided tool definitions to the LLM are now mapped to `metadata.tools` and no longer in `input.tools`. This is relevant in case you are running evaluations on your generations.
+
+</Callout>
+
 ## Langchain integration
 
 - **Import**: The import of the Langchain integration is now: