remove strictJson schema

[tkattkat]

why

Structured output mode is deprecated

what changed

removed usage of anthropic structured output mode

test plan

Ran tests locally + CI tests

---

Summary by cubic

Removed the deprecated anthropic.structuredOutputMode option from AISdk provider options to align with Anthropic’s deprecation and avoid sending unsupported flags. Updated unit tests and added a changeset; behavior for other providers is unchanged.

^{Written for commit 64daca7. Summary will update on new commits. Review in cubic}

[changeset-bot]

🦋 Changeset detected

Latest commit: 64daca7

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

This PR includes changesets to release 4 packages

Name	Type
@browserbasehq/stagehand	Patch
@browserbasehq/stagehand-evals	Patch
@browserbasehq/stagehand-server-v3	Patch
@browserbasehq/stagehand-server-v4	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant App as Stagehand Client
    participant SDK as AISdkClient (lib/v3/llm/aisdk.ts)
    participant VercelSDK as Vercel AI SDK
    participant Anthropic as Anthropic API

    Note over App, Anthropic: Initialization & Configuration Flow

    App->>SDK: initialize(modelName)
    SDK->>SDK: Parse provider from modelName

    alt provider == "anthropic"
        SDK->>SDK: CHANGED: Skip setting structuredOutputMode
        Note right of SDK: Removed deprecated "auto" flag
    else provider == "openai" or "azure"
        SDK->>SDK: Set strictJsonSchema: true
    else provider == "google" or "vertex" or "groq"
        SDK->>SDK: Set structuredOutputs: true
    end

    SDK->>VercelSDK: Initialize model with providerOptions
    VercelSDK-->>SDK: Model Instance

    Note over App, Anthropic: Runtime Request Flow

    App->>SDK: request(prompt, schema)
    SDK->>VercelSDK: generateObject / generateText
    
    VercelSDK->>Anthropic: POST /v1/messages
    Note right of VercelSDK: Request payload no longer includes<br/>unsupported 'structured_output_mode'
    
    Anthropic-->>VercelSDK: LLM Response (JSON/Text)
    VercelSDK-->>SDK: Parsed Result
    SDK-->>App: Typed Response

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