# why

Fixes https://github.com/browserbase/stagehand/issues/3337

The extension used `@ai-sdk/anthropic` 4.0.8 which predates opus 5.5.
For structured output, it sent a forced tool call (`tool_choice: { type:
"any" }`), which opus 5.5 rejected. Because of this, `act`, `observe`
and `extract` were also failing.

# what changed

- Bump `@ai-sdk/anthropic` to ^4.0.90. This version uses native
structured output for Opus 5.5.
- Bump `ai` to ^7.0.155. It must use the same `@ai-sdk/provider` version
as the new Anthropic package.
- Pin `@ai-sdk/anthropic` to 4.0.26 in mastra-sdk to match the
`@ai-sdk/provider` version that `@mastra/core` uses

# test plan

- Added a gateway test fixture to catch when tool choice is required but
the reply has no tool call


<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Bumps `@ai-sdk/anthropic` and `ai` in the extension so it works with
Claude Opus 5.5, fixing `act`, `observe`, and `extract` failures for
that model.

- Fixes #3337, where forced tool calls (`tool_choice: { type: "any" }`)
were rejected by Opus 5.5.
- Updates the mastra-sdk `NativeMastraModel` type to accept both OpenAI
and Anthropic models, since providers can use different
`@ai-sdk/provider` versions.
- Adds a gateway test fixture to catch when tool choice is required but
the reply has no tool call.

<sup>Written for commit a91cae96f07ac7d239a7bcd4f197d9bb53290a1f.
Summary will update on new commits.</sup>

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