.Net: Update Anthropic and Anthropic.Foundry package versions

[Copilot]

Motivation and Context

Anthropic.Foundry 0.4.1 now natively supports TokenCredential authentication, eliminating the need for custom credential wrapper implementations.

Description

Package Updates:

• Anthropic: 12.0.1 → 12.3.0
• Anthropic.Foundry: 0.1.0 → 0.4.1
• System.Net.ServerSentEvents: 10.0.0 → 10.0.1 (transitive)

Breaking API Changes in Anthropic SDK:

• APIKey → ApiKey property rename
• BaseUrl type changed from Uri to string
• IAnthropicClient now implements IDisposable
• Execute method moved to IAnthropicClientWithRawResponse
• New WithRawResponse property on IAnthropicClient and IBetaService

Sample Simplification:

Replaced 35-line custom AnthropicAzureTokenCredential with built-in class:

// Before (custom implementation required)
new AnthropicFoundryClient(new AnthropicAzureTokenCredential(new AzureCliCredential(), resource));

// After (native support)
new AnthropicFoundryClient(new AnthropicFoundryIdentityTokenCredentials(
    new AzureCliCredential(), resource, ["https://ai.azure.com/.default"]));

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• www.nuget.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

I need to update Anthropic and Anthropic.FOundry package versions.

As part of this update Anthropic.Foundry now supports TokenCredential and I can remove the custom IAnthropicFoundryCredentials implementation in https://github.com/microsoft/agent-framework/blob/0a0de4ac214668ab11695753ea40296e9669a709/dotnet/samples/GettingStarted/AgentProviders/Agent_With_Anthropic/Program.cs#L39C25-L39C55

Latest versions can be found here:
https://www.nuget.org/packages/Anthropic
https://www.nuget.org/packages/Anthropic.Foundry

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[Copilot]

Pull request overview

This PR updates the Anthropic SDK packages to their latest versions and adapts the codebase to handle breaking API changes. The update enables native TokenCredential support in Anthropic.Foundry, eliminating the need for a custom credential wrapper implementation.

Changes:

• Updated package versions: Anthropic 12.0.1 → 12.3.0, Anthropic.Foundry 0.1.0 → 0.4.1, System.Net.ServerSentEvents 10.0.0 → 10.0.1
• Adapted code to breaking API changes: APIKey → ApiKey, BaseUrl type change from Uri to string, and new interface members
• Replaced custom AnthropicAzureTokenCredential class (35 lines) with built-in AnthropicFoundryIdentityTokenCredentials

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
dotnet/Directory.Packages.props	Updated Anthropic, Anthropic.Foundry, and System.Net.ServerSentEvents package versions
dotnet/tests/Microsoft.Agents.AI.Anthropic.UnitTests/Extensions/AnthropicClientExtensionsTests.cs	Updated test mocks to reflect API changes: ApiKey property rename, BaseUrl type change, added WithRawResponse property and Dispose method
dotnet/tests/Microsoft.Agents.AI.Anthropic.UnitTests/Extensions/AnthropicBetaServiceExtensionsTests.cs	Updated test mocks with same API changes plus WithRawResponse property on IBetaService
dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionFixture.cs	Updated ApiKey property reference in test setup
dotnet/samples/GettingStarted/Workflows/_Foundational/05_MultiModelService/Program.cs	Updated ApiKey property reference in sample
dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step03_UsingFunctionTools/Program.cs	Updated ApiKey property reference in sample
dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step02_Reasoning/Program.cs	Updated ApiKey property reference in sample
dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step01_Running/Program.cs	Updated ApiKey property reference in sample
dotnet/samples/GettingStarted/AgentProviders/Agent_With_Anthropic/Program.cs	Removed custom credential implementation and unused using statements, replaced with built-in AnthropicFoundryIdentityTokenCredentials, updated ApiKey property reference