Is LoopCraft free to use?

Yes. LoopCraft offers a free tier for designing and exporting AI agent loop patterns. A Pro plan is available for advanced features.

What is Loop Engineering?

Loop Engineering is designing the control flow for AI agents: how they plan actions, observe results, and iterate. LoopCraft includes 11 pre-built patterns based on research from Anthropic, OpenAI, and others — including ReAct, Plan-Execute, Evaluator-Optimizer, Multi-Agent, and more. Design loops visually and export to LangGraph, OpenAI Agents SDK, AutoGen, or CrewAI.

Which frameworks can I export to?

LoopCraft exports to LangGraph (Python), OpenAI Agents SDK (TypeScript), AutoGen (Python), and CrewAI (Python). Each export produces working code you can run directly in your project.

Do I need to write code?

No. LoopCraft is a visual builder — you design loop patterns with a drag-and-drop interface and configure nodes without writing code. Code export to LangGraph, OpenAI SDK, AutoGen, and CrewAI is generated automatically and is optional.

What loop patterns are supported?

LoopCraft supports 11 agent loop patterns: ReAct (think-act-observe cycle), Prompt Chaining (sequential steps with quality gates), Routing (classify and direct inputs), Parallel Sectioning (independent subtasks in parallel), Parallel Voting (multiple runs for confidence), Orchestrator-Workers (dynamic task decomposition), Evaluator-Optimizer (generate-evaluate loop), Plan-and-Execute (plan then execute with replanning), ReWOO (variable passing between tasks), LLM Compiler (DAG-based parallel execution, 3.6x speedup), and Multi-Agent (collaborative agents with roles).

LoopCraft adds human-in-the-loop Approval node to the visual loop builder

Starting 2026-08-07, LoopCraft adds a Human Approval node to the visual loop builder. Drop the node onto any step that makes irreversible changes, and the loop pauses there, stores the pending action, and notifies reviewers by email or webhook with a one-click approve/reject card. Approvals resume the loop with the exact context and variables captured before the pause, so nothing is re-executed. Reviewers can also edit structured fields before approving, letting humans correct an agent's output without restarting the run. Timeouts are configurable: an expired approval can fail the loop, skip the step, or take a fallback branch. Every decision is written to the trace view together with the reviewer's identity and comment, giving teams a complete audit trail. The Human Approval node is available on all plans. Feedback: sapsap@qq.com.