anthropics

Anthropic SDK Csharp — AI skill for Claude Code

AI community

Access to Anthropic's safety-first language model APIs in C#.

How to install Anthropic SDK Csharp

This entry records only its repository, not the path inside it, so there is no exact command to give. Open anthropics/anthropic-sdk-csharp and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Anthropic SDK Csharp does

Access to Anthropic's safety-first language model APIs in C#.

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README

Claude SDK for C#

[![NuGet Version](https://img.shields.io/nuget/v/Anthropic.svg)](https://www.nuget.org/packages/Anthropic)

[!IMPORTANT] As of version 10+, the `Anthropic` package is now the official Claude SDK for C#. Package versions 3.X and below were previously used for the tryAGI community-built SDK, which has moved to [`tryAGI.Anthropic`](https://www.nuget.org/packages/tryagi.Anthropic/). If you need to continue using the former client in your project, update your package reference to `tryAGI.Anthropic`.

The Claude SDK for C# provides access to the [Claude API](https://docs.anthropic.com/en/api/) from C# applications.

Documentation

Full documentation is available at **[platform.claude.com/docs/en/api/sdks/csharp](https://platform.claude.com/docs/en/api/sdks/csharp)**.

Installation

dotnet add package Anthropic

Getting started

using System;
using Anthropic;
using Anthropic.Models.Messages;

AnthropicClient client = new();

MessageCreateParams parameters = new()
{
    MaxTokens = 1024,
    Messages =
    [
        new()
        {
            Role = Role.User,
            Content = "Hello, Claude",
        },
    ],
    Model = "claude-opus-4-6",
};

var message = await client.Messages.Create(parameters);

Console.WriteLine(message);