Libretto
Open-source CLI, debug agents, and browser tools for building and maintaining reliable web integrations.
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Description
Open-source CLI, debug agents, and browser tools for building and maintaining reliable web integrations.
About Libretto
What is Libretto?
Libretto turns a website workflow into a stable API and into reusable scripts in a codebase. It helps coding agents manage browser workflows, web scrapers, and on-prem apps.
What Libretto does
The open-source CLI records actions, can capture network, and can write scripts. When a Playwright automation fails, an agent inspects the live page and opens a pull request with the fix. The Browser Tools SDK has six tools that let an AI agent read pages and control a real browser with Playwright. The Chrome extension can save a workflow from Chrome, then run it again or schedule it in the cloud. The site says Libretto is backed by Y Combinator.
Who Libretto is for
Libretto is for coding agents and for a Node.js package that contains browser automations, in a new package or in an existing package.
How Libretto works
From the directory where a new package should be created, npm create libretto@latest scaffolds the package, installs dependencies, runs setup, and downloads Chromium. A package name can be passed directly, as in npm create libretto@latest my-automations. An existing package runs npm install libretto zod and then npx libretto setup. A workflow file exports a workflow with a zod input and output, a startUrl, and a page. npx libretto run with --headless runs that file. npx libretto open records a session and can write scripts.
Key features
- Open-source CLI that turns website workflows into reusable scripts, run with npx libretto.
- npm create libretto@latest scaffolds a package, installs dependencies, runs setup, and downloads Chromium.
- A failed Playwright run can be inspected on the live page, and a pull request can be opened with the fix.
- Six browser tools let an AI agent read pages and control a real browser with Playwright.
- The Chrome extension can save a workflow from Chrome, then run it again or schedule it in the cloud.
- A smoke workflow reads the page title and returns it, and that workflow can iterate into a minimal real workflow.
Facts from libretto.sh, checked 14 October 2026
- Libretto is backed by Y Combinator.
- Option A creates a new package. Option B adds Libretto to an existing Node.js package.
- After the smoke workflow, the docs list a first workflow, then a minimal real workflow to iterate on.
Written from Libretto's own website (Homepage, Docs). The maker can claim this listing to edit it.
Categories
Frequently asked questions
How is a new Libretto package created?
From the directory where the new package should be created, run npm create libretto@latest. A package name can be passed directly, for example npm create libretto@latest my-automations. That scaffolds a package, installs dependencies, runs setup, and downloads Chromium.
How is Libretto added to an existing package?
From the existing package directory, run npm install libretto zod and then npx libretto setup. Create a workflow file and run it with npx libretto run and --headless.
What does the CLI record?
npx libretto open records actions, can capture network, and can write scripts in the codebase. The quickstart then uses npx libretto run with --headless to confirm the local setup and show the basic run loop.
What is in the smoke workflow?
The quickstart creates src/workflows/scrape-page.ts. It imports workflow from libretto and z from zod, names the workflow scrape-page, sets a startUrl, reads the page title, and returns it.