loop.js
A loop engineering framework — state a Goal; Rounds run until a skeptical, read-only Verify agent settles it.
What is it?
What it is
**Loop.js is the framework for loop engineering.** You state a goal and what "done" means. The engine runs an agent at it, Round after Round —
Why it exists
A loop engineering framework — state a Goal; Rounds run until a skeptical, read-only Verify agent settles it.
Who should use it
Teams building with TypeScript who want an open-source, self-hosted option.
Who should avoid it
Teams that need a fully managed SaaS with enterprise SLAs out of the box.
How it works
A quick walkthrough in plain English
How loop.js works
Step 1 of 3
You interact with it
Open loop.js, send a request, or connect it to your stack.
Features
Advantages
- Open source (Apache-2.0)
- Active TypeScript ecosystem
- Self-hosted deployment options
Disadvantages
- Requires operational ownership for self-hosted setups
- Community support varies by project maturity
Installation
native
**Loop engineering** is designing the system that prompts an agent instead of prompting it turn by turn: a goal, a way to work, a way to verify, a stop discipline — the loop does the iterating. loop.js is that system as a framework: [what is loop engineering →](https://loop-js.mintlify.site/loop-engineering) ## Why loops need a framework Running an agent in `while (true)` is one line. Whether that loop ever *converges* is everything around it — and that is the part loop.js owns: | The pain | The machinery | | --- | --- | | The agent says "done" when it isn't | A separate **Verify** agent — own session, own (cheaper, if you like) model, **read-only by default** — judges every Round. Only its verdict settles the Loop; the worker never grades its own homework. | | Long sessions bloat and d
FAQ
What is loop.js?
loop.js is an open-source project licensed under Apache-2.0.
What language is loop.js built with?
Primary language: TypeScript.
Is it free to use?
Yes. Licensed under Apache-2.0. Check the license for commercial use.
Featured in Videos
YouTube tutorials and walkthroughs for loop.js
Alternatives
Similar projects ranked by category, topics, and text overlap.
