…events (#12456)

When using xAI Grok models (e.g. `grok-4-1-fast-reasoning`) with
function tools via the Responses API, the model streams
`response.function_call_arguments.delta` and
`response.function_call_arguments.done` events — standard Responses API
events also used by OpenAI. The `@ai-sdk/xai` provider's Zod schema did
not include these event types, causing `AI_TypeValidationError` and
breaking the entire stream whenever a function tool call was attempted.

**Summary**

- Added `response.function_call_arguments.delta` and
`response.function_call_arguments.done` to `xaiResponsesChunkSchema` in
`xai-responses-api.ts`
- Updated the stream handler in `xai-responses-language-model.ts` to:
  - Track ongoing tool calls by `output_index`
- Emit `tool-input-start` on `response.output_item.added` for
`function_call` items
- Emit `tool-input-delta` for each
`response.function_call_arguments.delta` event
- Emit `tool-input-end` and `tool-call` on `response.output_item.done`
(once arguments are fully received)
- Skip `response.custom_tool_call_input.delta/done` events for
`function_call` items (these are handled by the output_item events)
- Added unit test for function call argument streaming

**Manual Verification**

Built the patched `@ai-sdk/xai` locally and ran an e2e test against the
real xAI API using `grok-4-1-fast-reasoning` with a function tool:

**Before fix** — `AI_TypeValidationError` on
`response.function_call_arguments.done`:
```
AI_TypeValidationError: Type validation failed: Value: {
  "sequence_number":4,
  "type":"response.function_call_arguments.done",
  "arguments":"{}",
  "item_id":"fc_14f28817-...",
  "output_index":0
}
```

**After fix** — full streaming pipeline works:
```
tool-input-start:  PASS
tool-input-delta:  PASS
tool-call:         PASS
no errors:         PASS
```

**Checklist**

- [x] Tests have been added / updated (for bug fixes / features)
- [ ] Documentation has been added / updated (for bug fixes / features)
- [x] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run `pnpm changeset` in the project root)
- [x] I have reviewed this pull request (self-review)

## Related Issues

Fixes function tool calls failing with `AI_TypeValidationError` for xAI
Grok models using the Responses API.

This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## @ai-sdk/xai@3.0.54

### Patch Changes

- 902e93b: Add support for `response.function_call_arguments.delta` and
`response.function_call_arguments.done` streaming events in the xAI
Responses API provider. Previously, xAI Grok models using function tools
would fail with `AI_TypeValidationError` because these standard
Responses API events were missing from the Zod schema and stream
handler.

Co-authored-by: vercel-ai-sdk[bot] <225926702+vercel-ai-sdk[bot]@users.noreply.github.com>

#12462)

## Background

When generating videos from images using the Google Vertex AI provider,
the MIME type was not being passed along with the base64-encoded image
data. This resulted in Vertex failing with an error re: missing mime
type for media.

## Summary

This PR fixes the Google Vertex provider's image-to-video generation by
properly passing the MIME type with the base64-encoded image data.

## Manual Verification

Tested the image-to-video generation functionality with a base64-encoded
image and confirmed that the video is generated correctly with the MIME
type properly passed to the API.

## Checklist

- [x] Tests have been added / updated (for bug fixes / features)
- [x] Documentation has been added / updated (for bug fixes / features)
- [x] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run `pnpm changeset` in the project root)
- [x] I have reviewed this pull request (self-review)

This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## @ai-sdk/google-vertex@4.0.54

### Patch Changes

- a8835e9: fix (provider/google-vertex): pass mime type with i2v video
generation

Co-authored-by: vercel-ai-sdk[bot] <225926702+vercel-ai-sdk[bot]@users.noreply.github.com>

…parsing (#12474)

## Background

The gateway video model was missing support for certain warning types in
the response parsing schema, specifically for 'unsupported' and
'compatibility' warnings. This limited the ability to properly handle
and display these warning types when they were returned from providers.

## Summary

Added support for additional warning types in the gateway video model
response parsing:
- Added 'unsupported' warning type with feature and optional details
fields
- Added 'compatibility' warning type with feature and optional details
fields
- Updated the schema to use a discriminated union for proper type
validation
- Added tests to verify the correct handling of these new warning types

## Checklist

- [x] Tests have been added / updated (for bug fixes / features)
- [x] A _patch_ changeset for relevant packages has been added (for bug
fixes / features - run `pnpm changeset` in the project root)
- [x] I have reviewed this pull request (self-review)

## Related Issues

Fixes an issue where 'unsupported' and 'compatibility' warnings from
video providers weren't properly handled by the gateway.

This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## ai@6.0.82

### Patch Changes

-   Updated dependencies [1819bc1]
    -   @ai-sdk/gateway@3.0.42

## @ai-sdk/angular@2.0.83

### Patch Changes

-   ai@6.0.82

## @ai-sdk/gateway@3.0.42

### Patch Changes

- 1819bc1: fix (provider/gateway): add missing warning types for video
response parsing

## @ai-sdk/langchain@2.0.87

### Patch Changes

-   ai@6.0.82

## @ai-sdk/llamaindex@2.0.82

### Patch Changes

-   ai@6.0.82

## @ai-sdk/react@3.0.84

### Patch Changes

-   ai@6.0.82

## @ai-sdk/rsc@2.0.82

### Patch Changes

-   ai@6.0.82

## @ai-sdk/svelte@4.0.82

### Patch Changes

-   ai@6.0.82

## @ai-sdk/vue@3.0.82

### Patch Changes

-   ai@6.0.82

Co-authored-by: vercel-ai-sdk[bot] <225926702+vercel-ai-sdk[bot]@users.noreply.github.com>