Upgrade Anthropic provider from beta SDK to stable v1.4.0

[ksylvan]

Upgrade Anthropic provider from beta SDK to stable v1.4.0

Summary

This PR updates the Anthropic SDK integration from beta version 0.2.0-beta.2 to stable version 1.4.0, along with necessary code changes to accommodate the SDK's API updates. The changes also include documentation updates to add the Claude 4 models to the supported model list.

Files Changed

README.md

Added Claude 4 Sonnet and Claude 4 Opus to the list of supported Anthropic models in the documentation.

cmd/schema/README.md

Minor formatting fix - removed extra newline at end of file.

go.mod and go.sum

Updated the Anthropic SDK dependency from v0.2.0-beta.2 to v1.4.0.

internal/llm/provider/anthropic.go

Updated code to match the new SDK API:

• Changed field references from OfRequestTextBlock to OfText for text content blocks
• Updated tool use block creation to use NewToolUseBlock helper function
• Simplified thinking configuration parameter creation using ThinkingConfigParamOfEnabled helper

Code Changes

Text Block Cache Control Updates

// Before
content.OfRequestTextBlock.CacheControl = anthropic.CacheControlEphemeralParam{
    Type: "ephemeral",
}

// After
content.OfText.CacheControl = anthropic.CacheControlEphemeralParam{
    Type: "ephemeral",
}

Tool Use Block Creation

// Before
anthropic.ContentBlockParamOfRequestToolUseBlock(toolCall.ID, inputMap, toolCall.Name)

// After
anthropic.NewToolUseBlock(toolCall.ID, inputMap, toolCall.Name)

Thinking Configuration Simplification

// Before
thinkingParam = anthropic.ThinkingConfigParamUnion{
    OfThinkingConfigEnabled: &anthropic.ThinkingConfigEnabledParam{
        BudgetTokens: int64(float64(a.providerOptions.maxTokens) * 0.8),
        Type:         "enabled",
    },
}

// After
thinkingParam = anthropic.ThinkingConfigParamOfEnabled(int64(float64(a.providerOptions.maxTokens) * 0.8))

Reason for Changes

1. SDK Stability: Moving from a beta version to a stable release ensures better reliability and support
2. API Compatibility: The SDK's API has changed between the beta and stable versions, requiring code updates to maintain functionality
3. Documentation Accuracy: Adding Claude 4 models to the documentation ensures users are aware of all available model options

Impact of Changes

• Improved Stability: Using a stable SDK version reduces the risk of breaking changes and improves overall reliability
• No Functional Changes: The updates maintain the same functionality while adapting to the new SDK API
• Better Developer Experience: The new SDK provides cleaner helper functions (like ThinkingConfigParamOfEnabled) that simplify the code

Test Plan

• Verify that all Anthropic model interactions work correctly with the new SDK

• Test message conversion with cache control enabled and disabled

• Ensure tool use functionality continues to work as expected

• Validate that thinking mode triggers correctly based on message content

• Used compiled go binary to do major refactoring of an existing code repository:

Additional Notes

The changes are primarily mechanical updates to accommodate the SDK's API changes. The core logic and behavior remain unchanged. The addition of Claude 4 models to the documentation suggests these models are now available for use, though no code changes were needed to support them.

[kujtimiihoxha]

Looks like everything is working, thanks for the PR

[ksylvan]

Looks like everything is working, thanks for the PR

My pleasure.