Prompty.Anthropic 2.0.0-beta.1

.NET 9.0 This package targets .NET 9.0. The package is compatible with this framework or higher.
This is a prerelease version of Prompty.Anthropic. 
dotnet add package Prompty.Anthropic --version 2.0.0-beta.1
                    


                    

                
NuGet\Install-Package Prompty.Anthropic -Version 2.0.0-beta.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Prompty.Anthropic" Version="2.0.0-beta.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Prompty.Anthropic" Version="2.0.0-beta.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Prompty.Anthropic" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Prompty.Anthropic --version 2.0.0-beta.1
                    


                    

                
#r "nuget: Prompty.Anthropic, 2.0.0-beta.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Prompty.Anthropic@2.0.0-beta.1
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Prompty.Anthropic&version=2.0.0-beta.1&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Prompty.Anthropic&version=2.0.0-beta.1&prerelease
                    


                            Install as a Cake Tool

Prompty.Anthropic

Anthropic Claude provider for Prompty — executor and processor for Claude models via the Anthropic Messages API. Uses direct HTTP (no SDK dependency) for a lightweight footprint.

Installation

dotnet add package Prompty.Core
dotnet add package Prompty.Anthropic

Quick Start

using Prompty.Core;
using Prompty.Anthropic;

// One-time setup — registers renderers, parser, and Anthropic provider
new PromptyBuilder()
    .AddAnthropic();

// Run a .prompty file
var result = await Pipeline.InvokeAsync("chat.prompty", new Dictionary<string, object>
{
    ["question"] = "Explain quantum computing in simple terms"
});

Console.WriteLine(result);

.prompty Configuration

---
name: claude-chat
model:
  id: claude-sonnet-4-20250514
  provider: anthropic
  apiType: chat
  connection:
    kind: key
    endpoint: https://api.anthropic.com
    apiKey: ${env:ANTHROPIC_API_KEY}
  options:
    temperature: 0.7
    maxOutputTokens: 1024
---
system:
You are a helpful assistant.

user:
{{question}}

Supported Models

Any model available through the Anthropic Messages API:

  • claude-sonnet-4-20250514
  • claude-3-5-sonnet-20241022
  • claude-3-haiku-20240307
  • claude-3-opus-20240229

Features

Feature Supported
Chat completions ✅
Streaming (SSE) ✅
Tool calling ✅
Agent turns (tool loop) ✅
Structured output ✅
Image inputs (base64) ✅
System prompts ✅ (extracted per Anthropic convention)

Authentication

API Key

model:
  connection:
    kind: key
    endpoint: https://api.anthropic.com    # optional, this is the default
    apiKey: ${env:ANTHROPIC_API_KEY}

Agent Turns (Tool Calling)

Anthropic's tool calling follows the same pattern as other providers:

var tools = new Dictionary<string, Func<string, Task<string>>>
{
    ["get_weather"] = async (args) => "72°F and sunny"
};

var result = await Pipeline.TurnAsync(
    agent, inputs, tools, maxIterations: 10);

Architecture Notes

This package uses direct HTTP via HttpClient rather than an Anthropic SDK. This means:

  • Zero external package dependencies (only Prompty.Core)
  • Full control over the Messages API wire format
  • Lightweight — no SDK overhead

Documentation

Visit prompty.ai for full documentation.

License

MIT

Product Compatible and additional computed target framework versions.
.NET net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
2.0.0-beta.1 51 5/5/2026
2.0.0-alpha.11 49 5/5/2026
2.0.0-alpha.10 56 4/14/2026
2.0.0-alpha.9 60 4/13/2026
2.0.0-alpha.8 57 4/10/2026
2.0.0-alpha.7 62 4/9/2026
2.0.0-alpha.6 54 4/8/2026
2.0.0-alpha.2 58 4/8/2026
2.0.0-alpha.1 63 4/8/2026