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🦋 Changeset detectedLatest commit: a91cae9 The changes in this PR will be included in the next version bump. This PR includes changesets to release 23 packages
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No issues found across 3 files
Confidence score: 5/5
- Automated review surfaced no issues in the provided summaries.
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Architecture diagram
sequenceDiagram
participant Ext as Stagehand Extension
participant LLM as LLM Service
participant SDK as AI SDK (ai + @ai-sdk/anthropic)
participant Provider as Anthropic Provider
participant API as Anthropic API (Opus 5.5)
Note over Ext,API: Structured Output Flow (act/observe/extract)
Ext->>LLM: generate() with tool definitions + tool_choice: "required"
LLM->>SDK: generateText() with structured output config
SDK->>Provider: Convert to Anthropic Responses API format
Provider->>API: POST /v1/messages/responses (native tool use)
API-->>Provider: Response with function_call output
Provider->>Provider: Process native structured output
Provider-->>SDK: Return validated tool call result
SDK-->>LLM: Tool call result
LLM-->>Ext: Parsed action/observation/extraction
Note over SDK,Provider: Version alignment
SDK->>SDK: Ensure @ai-sdk/provider version compatibility
SDK->>Provider: Shared provider interface contract
Note over Provider,API: Opus 5.5 native structured output
alt Native structured output supported (new SDK)
Provider->>API: Use native tool_choice (no forced "any")
API-->>Provider: Tool call in output
else Legacy forced tool choice (old SDK)
Provider->>API: Send tool_choice: { type: "any" }
API-->>Provider: Rejected - 400 error (model incompatibility)
end
Note over LLM,Provider: Gateway Test Fixture (NEW)
LLM->>Provider: Simulate reply with no tool call
Provider->>Provider: NEW: Validate tool_choice "required" + missing call
Provider-->>LLM: Reject with error
LLM-->>Ext: Handle error as no valid tool call
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…date changeset for python
seanmcguire12
approved these changes
Oct 29, 2026
akeimach
deleted the
alyssamaruyama/ap-3103-upgrade-ai-sdk-for-opus-55-compatibility
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October 29, 2026 18:59
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why
Fixes #3337
The extension used
@ai-sdk/anthropic4.0.8 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,observeandextractwere also failing.what changed
@ai-sdk/anthropicto ^4.0.90. This version uses native structured output for Opus 5.5.aito ^7.0.155. It must use the same@ai-sdk/providerversion as the new Anthropic package.@ai-sdk/anthropicto 4.0.26 in mastra-sdk to match the@ai-sdk/providerversion that@mastra/coreusestest plan
Summary by cubic
Bumps
@ai-sdk/anthropicandaiin the extension so it works with Claude Opus 5.5, fixingact,observe, andextractfailures for that model.tool_choice: { type: "any" }) were rejected by Opus 5.5.NativeMastraModeltype to accept both OpenAI and Anthropic models, since providers can use different@ai-sdk/providerversions.Written for commit a91cae9. Summary will update on new commits.