fix(anthropic): use anthropic sdk to transform malformed response schemas to anthropic format

[waleedlatif1]

Summary

• use anthropic sdk to transform malformed response schemas to anthropic format
• anthropic adds additionalProperties: false to all response formats and has specific output criteria, so we use the official SDK to transform it

Type of Change

• Bug fix

Testing

Tested manually

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Review	Updated (UTC)
docs	Ready	Preview, Comment	Jan 25, 2026 4:14am

[greptile-apps]

Greptile Overview

Greptile Summary

Upgraded @anthropic-ai/sdk from 0.39.0 to 0.71.2 and replaced custom JSON schema transformation logic with the official SDK's built-in transformJSONSchema function.

Key Changes:

• Upgraded SDK version from ^0.39.0 to 0.71.2 (exact version pinning)
• Replaced manual schema transformation (previously ~170 lines in utils.ts) with SDK's transformJSONSchema import
• Removed custom implementation that added additionalProperties: false and handled unsupported constraints
• New SDK dependencies added: json-schema-to-ts@^3.1.1, ts-algebra@^2.0.0, @babel/runtime@7.28.6

Benefits:

• Reduces maintenance burden by using official SDK implementation
• Ensures compatibility with Anthropic's structured outputs API requirements
• Eliminates risk of divergence from official transformation logic
• Removes ~170 lines of custom code

Confidence Score: 5/5

• Safe to merge - this change improves code quality by replacing custom logic with official SDK implementation
• The PR correctly upgrades the Anthropic SDK and replaces a custom transformJSONSchema implementation with the official SDK's built-in function. The change is straightforward, well-isolated, and improves maintainability. The exact version pinning (0.71.2 instead of ^0.71.2) ensures consistency. Previous version conflicts mentioned in earlier review threads have been properly resolved - the old 0.39.0 version only remains as a dependency of @browserbasehq/stagehand, which won't conflict with the sim app's usage.
• No files require special attention

Important Files Changed

Filename	Overview
apps/sim/package.json	Upgraded @anthropic-ai/sdk from ^0.39.0 to 0.71.2 with exact version pinning
apps/sim/providers/anthropic/index.ts	Replaced manual schema transformation with official SDK's transformJSONSchema function from @anthropic-ai/sdk/lib/transform-json-schema
bun.lock	Updated lockfile reflects SDK upgrade to 0.71.2 with new dependencies (json-schema-to-ts, ts-algebra, @babel/runtime)

Sequence Diagram

sequenceDiagram
    participant Client
    participant AnthropicProvider
    participant SDK as @anthropic-ai/sdk
    participant Transform as transformJSONSchema
    participant API as Anthropic API

    Client->>AnthropicProvider: executeRequest(request)
    
    alt request.responseFormat exists
        AnthropicProvider->>AnthropicProvider: Check if native structured outputs supported
        
        alt useNativeStructuredOutputs = true
            Note over AnthropicProvider: Extract schema from request.responseFormat
            AnthropicProvider->>Transform: transformJSONSchema(schema)
            Note over Transform: SDK transforms schema:<br/>- Adds additionalProperties: false<br/>- Removes unsupported constraints<br/>- Filters string formats
            Transform-->>AnthropicProvider: transformedSchema
            AnthropicProvider->>AnthropicProvider: Set payload.output_format = {<br/>  type: 'json_schema',<br/>  schema: transformedSchema<br/>}
        else useNativeStructuredOutputs = false
            AnthropicProvider->>AnthropicProvider: generateSchemaInstructions(schema)
            AnthropicProvider->>AnthropicProvider: Append schema to system prompt
        end
    end
    
    AnthropicProvider->>SDK: messages.create(payload)
    SDK->>API: HTTP Request with transformed schema
    API-->>SDK: Response
    SDK-->>AnthropicProvider: Response
    AnthropicProvider-->>Client: ProviderResponse | StreamingExecution

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[waleedlatif1]

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[waleedlatif1]

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