Add support for Anthropic Claude models via Google Vertex AI

[SrikarMannepalli]

Why are these changes needed?

This PR adds support for Anthropic Claude models via Google Vertex AI by introducing AnthropicVertexChatCompletionClient.

Background

While AutoGen already supports Anthropic Claude models through:

• Direct API (AnthropicChatCompletionClient)
• AWS Bedrock (AnthropicBedrockChatCompletionClient)

This PR add support for accessing Claude models through Vertex AI.

Changes Made

1. New Client Class: AnthropicVertexChatCompletionClient following the same pattern as the existing Bedrock client
2. Configuration Types: Added VertexInfo and related config models for GCP project/region configuration
3. Tests: Added 11 comprehensive test cases covering initialization, serialization, config conversion, and mocked API calls
4. Documentation: Added docstrings with usage examples and configuration loading patterns

Implementation Details

• Uses Anthropic's official AsyncAnthropicVertex client
• Requires project_id and region via VertexInfo configuration
• Maintains consistency with existing AutoGen model client patterns
• Supports all standard Claude model capabilities (vision, function calling, streaming)

Usage Example

from autogen_ext.models.anthropic import AnthropicVertexChatCompletionClient, VertexInfo

client = AnthropicVertexChatCompletionClient(
    model="claude-3-sonnet-20240229",
    vertex_info=VertexInfo(
        project_id="your-gcp-project-id",
        region="us-east5"
    )
)

Checks

• [x] I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• [x] I've added tests (if relevant) corresponding to the changes introduced in this PR.
• [x] I've made sure all auto checks have passed.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 81.30%. Comparing base (13e144e) to head (dc93a88).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7097      +/-   ##
==========================================
+ Coverage   81.22%   81.30%   +0.07%     
==========================================
  Files         244      244              
  Lines       18512    18564      +52     
==========================================
+ Hits        15036    15093      +57     
+ Misses       3476     3471       -5     

Flag	Coverage Δ
unittests	81.30% <100.00%> (+0.07%)	:arrow_up:

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[SrikarMannepalli]

Hi @ekzhu, This change introduces support for Anthropic Claude models via Google Vertex AI along with tests. I kindly request you to review the PR whenever you get a chance. Please let me know if there are any additional adjustments or clarifications you’d like. Thanks so much for your time 🙏

[priteesshhh]

I analyzed this issue but couldn't identify the affected files. Could you please provide more details about which files need to be modified?

[SrikarMannepalli]

I analyzed this issue but couldn't identify the affected files. Could you please provide more details about which files need to be modified?

This aims to add support for Anthropic Claude models via Google Vertex AI, and majorly affects the python/packages/autogen-ext/src/autogen_ext/models/anthropic/_anthropic_client.py file (in which a new class AnthropicVertexChatCompletionClient has been added) and its corresponding test.