.NET: Add Anthropic Agent Package by rogerbarreto · Pull Request #2359 · microsoft/agent-framework

Roger Barreto (rogerbarreto) · 2025-11-20T21:40:22Z

Adding Anthropic AIAgent Support

Using offical Anthropic Package.

https://www.nuget.org/packages/Anthropic

Unit Tests
Integration Tests
Extensions
Samples

Polyfill will be removed as soon new Anthropic Package releases with IChatClient support.
Add Microsoft.Extensions.AI support anthropics/anthropic-sdk-csharp#10

cc: Stephen Toub (@stephentoub)

…nto feature-anthropic-package

Copilot

Pull Request Overview

This PR adds comprehensive support for Anthropic Claude models to the Microsoft Agent Framework, enabling developers to create AI agents using the official Anthropic SDK.

Key Changes:

Integration with Anthropic SDK via polyfill extensions (to be replaced once upstream PR merges)
Extension methods for creating agents from IAnthropicClient and IBetaService
Support for advanced features including reasoning/thinking capabilities and function tools

Reviewed Changes

Copilot reviewed 34 out of 34 changed files in this pull request and generated 27 comments.

Show a summary per file

File	Description
dotnet/src/Microsoft.Agents.AI.Anthropic/Microsoft.Agents.AI.Anthropic.csproj	New project file for Anthropic agent support package
dotnet/src/Microsoft.Agents.AI.Anthropic/AnthropicClientExtensions.cs	Extension methods to create AI agents from IAnthropicClient
dotnet/src/Microsoft.Agents.AI.Anthropic/AnthropicBetaServiceExtensions.cs	Extension methods to create AI agents from IBetaService
dotnet/src/Microsoft.Agents.AI.Anthropic/AnthropicClientJsonContext.cs	JSON serialization context for Anthropic operations
dotnet/src/Microsoft.Agents.AI.Anthropic/External/AnthropicClientExtensions.cs	Polyfill implementation for IChatClient support (temporary)
dotnet/src/Microsoft.Agents.AI.Anthropic/External/AnthropicBetaClientExtensions.cs	Polyfill implementation for Beta service IChatClient support (temporary)
dotnet/tests/Microsoft.Agents.AI.Anthropic.UnitTests/Microsoft.Agents.AI.Anthropic.UnitTests.csproj	Unit test project configuration
dotnet/tests/Microsoft.Agents.AI.Anthropic.UnitTests/Extensions/AnthropicClientExtensionsTests.cs	Unit tests for IAnthropicClient extension methods
dotnet/tests/Microsoft.Agents.AI.Anthropic.UnitTests/Extensions/AnthropicBetaServiceExtensionsTests.cs	Unit tests for IBetaService extension methods
dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletion.IntegrationTests.csproj	Integration test project configuration
dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionFixture.cs	Test fixture supporting both regular and reasoning models
dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionRunTests.cs	Integration tests for agent runs
dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionRunStreamingTests.cs	Integration tests for streaming agent runs
dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionChatClientAgentRunTests.cs	Integration tests for ChatClientAgent runs
dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionChatClientAgentRunStreamingTests.cs	Integration tests for streaming ChatClientAgent runs
dotnet/src/Shared/IntegrationTests/AnthropicConfiguration.cs	Configuration class for Anthropic integration tests
dotnet/samples/GettingStarted/README.md	Updated to reference new Anthropic samples
dotnet/samples/GettingStarted/AgentWithAnthropic/README.md	Documentation for Anthropic agent samples
dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step01_Running/Program.cs	Sample demonstrating basic Anthropic agent usage
dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step02_Reasoning/Program.cs	Sample demonstrating extended thinking/reasoning capabilities
dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step03_UsingFunctionTools/Program.cs	Sample demonstrating function tool integration
dotnet/samples/GettingStarted/AgentProviders/README.md	Updated to reference new Anthropic provider sample
dotnet/samples/GettingStarted/AgentProviders/Agent_With_Anthropic/Program.cs	Sample showing different deployment scenarios (Public API, Azure Foundry)
dotnet/samples/GettingStarted/AgentProviders/Agent_With_OpenAIChatCompletion/Program.cs	Unrelated code accidentally added
dotnet/nuget.config	Added local package source (developer-specific path)
dotnet/Directory.Packages.props	Added Anthropic package references
dotnet/agent-framework-dotnet.slnx	Added new projects to solution

…rreto/agent-framework-public into feature-anthropic-dotnet

* WIP * WIP * Simple call working * Update Thinking sample * Non-Streaming Function calling working * Update Anthropic Impl * Public Preps * UT + IT working * Update documentation + samples * Update variable * Revert nuget.config * Add IT for BetaService implementation * Remove polyfill + enable IT to run for netstandard 2.0 * Skipping Anthropic IT's for manual execution and avoid pipeline execution * Fix compilation error * Address error in UT * Apply suggestions from code review Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Fix warning * Net 10 update * Update for NET 10, remove Anthropic.Foundry due to vulnerability * Final missing adjustments for NET 10 * Address PR comments * Remove unused code * Address feedback --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Roger Barreto (rogerbarreto)and others added 10 commits November 16, 2025 13:36

WIP
962b479

WIP
a9077ab

Simple call working
179fcce

Update Thinking sample
c849515

Non-Streaming Function calling working
6e6e547

Update Anthropic Impl
d44f62c

Public Preps
b1f6466

Merge branch 'main' ofhttps://github.com/microsoft/agent-frameworki…
7ed4cae
…nto feature-anthropic-package

UT + IT working
d22c39e

Update documentation + samples
faf8831

CopilotAI review requested due to automatic review settings November 20, 2025 21:40

Mark Wallace (markwallace-microsoft) added documentation Usage: [Issues, PRs], Target: documentation in the code base and learn docs .NET Usage: [Issues, PRs], Target: .Net labels Nov 20, 2025

Roger Barreto (rogerbarreto)had a problem deploying to integration November 20, 2025 21:40 — with GitHub Actions Error

github-actionsBot changed the title ~~.Net: Add Anthropic Agent Package~~ .NET: Add Anthropic Agent Package Nov 20, 2025

Update variable
b7d548c

Copilotstarted reviewing on behalf of Roger Barreto (rogerbarreto)November 20, 2025 21:40 View session

Roger Barreto (rogerbarreto)had a problem deploying to integration November 20, 2025 21:41 — with GitHub Actions Error

Roger Barreto (rogerbarreto) added 2 commits November 20, 2025 21:42

Revert nuget.config
e6004a0

Merge branch 'main' into feature-anthropic-dotnet
66b9fde

Copilotfinished reviewing on behalf of Roger Barreto (rogerbarreto)November 20, 2025 21:43

Roger Barreto (rogerbarreto)temporarily deployed to integration November 20, 2025 21:43 — with GitHub Actions Inactive

CopilotAI reviewed Nov 20, 2025
View reviewed changes

Roger Barreto (rogerbarreto) added 2 commits November 20, 2025 22:11

Add IT for BetaService implementation
ffbaf27

Merge branch 'feature-anthropic-dotnet' ofhttps://github.com/rogerba…
df8c3ad
…rreto/agent-framework-public into feature-anthropic-dotnet

Roger Barreto (rogerbarreto)temporarily deployed to integration November 20, 2025 22:12 — with GitHub Actions Inactive

dependabotBot mentioned this pull request Jan 1, 2026
chore: Bump the production-dependencies group with 4 updates sterob-2/orchestrator#8
Merged

This was referenced Feb 2, 2026
chore(nuget): Bump Microsoft.Agents.AI and 3 others mattdot/issueagent#65
Open
deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#31
Closed

dependabotBot mentioned this pull request Feb 16, 2026
deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#34
Closed

This was referenced Feb 23, 2026
deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#39
Closed
deps: Bump Microsoft.Agents.AI and Microsoft.Extensions.DependencyInjection.Abstractions alcherkas/AgenTerra#42
Open

dependabotBot mentioned this pull request Mar 16, 2026
deps(nuget): Bump Microsoft.Agents.AI.OpenAI from 1.0.0-preview.251001.2 to 1.0.0-rc4 PlagueHO/prompt-babbler#32
Merged

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.NET: Add Anthropic Agent Package - #2359

.NET: Add Anthropic Agent Package #2359
Roger Barreto (rogerbarreto) merged 31 commits into
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rogerbarreto:feature-anthropic-dotnet

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Roger Barreto (rogerbarreto) commented Nov 20, 2025•
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