feat: upgrade to ai sdk 5

[farazcsk]

Moves us over the an improved more manageably UIMessage api (particularly easier to handle tool calls with custom ui). This change is also required for us to adopt vercel's ai sdk elements. Also includes improvements to the layout of the playground more broadly.

CleanShot.2025-11-07.at.16.23.57.mp4

[linear]

AGE-699 Migrate to AI SDK 5

[changeset-bot]

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Latest commit: c1d6871

The changes in this PR will be included in the next version bump.

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[chase-crumbaugh]

Just a few small things:

These three dots seem to just open the add tools dialog. I'd just remove them since that it redundant with (and better conveyed by) the plus button

The mismatched styles of these dropdowns is bothersome. The environment one looks more polished IMO

The edit name/description dialog just doesn't look right. I think we'd benefit a lot from at least labeling the inputs. I'm biased but I think the labeled "boxes" we use on the custom tools page and MCP details pages would look great here

[chase-crumbaugh]

Functionality wise I still think it's a pretty big loss that you can't add environment vars without leaving this page anymore considering that's one of the main actions people need to take to use the playground. That either needs to be part of this PR or an immediate fast-follow IMO

[ryan-timothy-albert]

Two Issues I'm encountering relating to using tools

• It doesn't appear function tools are showing up in the playground context anymore. They show up on the sidebar but when you try to use them the chat doesn't seem to have access to those tools specifically
• When I add a tool in the playground to a toolset. It doesn't get reflected until I hard refresh the page