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What is Simforge?

Simforge is a platform that helps you build, test, and deploy LLM-powered functions. It provides:
  • Function Management: Define and version your LLM functions with BAML
  • Tracing: Monitor and debug your LLM calls with detailed traces
  • Testing: Run test suites against your functions to ensure quality
  • SDKs: Call your functions from TypeScript or Python applications

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Quick Start

Get API Keys

Create API keys to authenticate with Simforge

TypeScript SDK

Install and use the TypeScript SDK

Python SDK

Install and use the Python SDK

VS Code Extension

Install the VS Code extension for IDE integration

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How It Works

  1. Define Functions: Create LLM functions in the Simforge web portal using BAML syntax
  2. Get API Keys: Generate API keys from the settings page
  3. Install SDK: Add the Simforge SDK to your project
  4. Call Functions: Use the SDK to call your functions with type-safe inputs and outputs
import { Simforge } from "@goharvest/simforge"

const client = new Simforge({
  apiKey: process.env.SIMFORGE_API_KEY,
  envVars: {
    OPENAI_API_KEY: process.env.OPENAI_API_KEY,
  },
})

const result = await client.call("ExtractName", {
  text: "My name is John Doe",
})

console.log(result) // { firstName: "John", lastName: "Doe" }
Currently, only OpenAI is supported as an LLM provider.

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Architecture

Simforge uses BAML (Basically A Made-up Language) to define LLM functions. BAML provides:
  • Type-safe inputs and outputs
  • Prompt templating
  • Provider configuration
  • Automatic retry and fallback logic
Your BAML functions are executed locally by the SDK, giving you full control over your LLM calls while Simforge handles versioning, testing, and monitoring.