Introduction

Loopstack is a TypeScript workflow framework for building stateful automations, AI agents, and interactive workflows on top of NestJS.

What You Can Build

• AI Workflows — Stateful automations that chain tools, transform data, and route dynamically
• AI Agents — AI agent harnesses with tool calling, context management and message history
• Orchestration Systems — Compose complex systems by spawning nested agents and workflows
• Secure Execution — Run code and access files in isolated sandboxed environments
• HITL Systems — Pause workflows for Human-in-the-Loop review, input, or confirmation

…built directly into your NestJS backends.

How It Works

Loopstack apps are built from three core concepts:

• Workflows — TypeScript classes that define a state machine with transitions, guards, and routing
• Tools — Reusable logic units called directly in your workflows
• Documents — Structured data objects displayed in the Loopstack Studio UI

Next steps

• Core Concepts — understand workflows, tools, documents, and providers
• Capabilities — quick feature matrix to validate your use case
• Getting Started — set up your first project