Prompty.Anthropic

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

Authentication

API Key

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

Agent Mode (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