# Add to your Claude Code skills
git clone https://github.com/saffron-health/libretto
README.md
Libretto
Libretto is a toolkit for building robust web integrations. It gives your coding agent a live browser and a token-efficient CLI to:
Inspect live pages with minimal context overhead
Capture network traffic to reverse-engineer site APIs
Record user actions and replay them as automation scripts
Debug broken workflows interactively against the real site
We at Saffron Health built Libretto to help us maintain our browser integrations to common healthcare software. We're open-sourcing it so other teams have an easier time doing the same thing.
npm install libretto
# First-time onboarding: install skill, download Chromium, and pin the default snapshot model
npx libretto setup
# Check workspace readiness at any time
npx libretto status
# Manually change the snapshot analysis model (advanced override)
npx libretto ai configure <openai | anthropic | gemini | vertex>
setup detects available provider credentials (e.g. OPENAI_API_KEY) and automatically pins the default model to .libretto/config.json. Re-running setup on a healthy workspace shows the current configuration instead of re-prompting. If credentials are missing for a previously configured provider, setup offers an interactive repair flow.
Use ai configure when you want to explicitly switch providers or set a custom model string.
Use cases
Libretto is designed to be used as a skill through your coding agent. Here are some example prompts:
One-shot script generation
Use the Libretto skill. Go on LinkedIn and scrape the first 10 posts for content, who posted it, the number of reactions, the first 25 comments, and the first 25 reposts.
Your coding agent will open a window for you to log into LinkedIn, and then automatically start exploring.
Interactive script building
I'm gonna show you a workflow in the eclinicalworks EHR to get a patient's primary insurance ID. Use libretto skill to turn it into a playwright script that takes patient name and dob as input to get back the insurance ID. URL is ...
Libretto can read your actions you perform in the browser, so you can perform a workflow, then ask it to use your actions to rebuild the workflow.
Convert browser automation to network requests
We have a browser script at ./integration.ts that automates going to Hacker News and getting the first 10 posts. Convert it to direct network scripts instead. Use the Libretto skill.
Libretto can read network requests from the browser, which it can use to reverse engineer the API and create a script that directly calls those requests. Directly making API calls is faster, and more reliable, than UI automation. You can also ask Libretto to conduct a security analysis which analyzes the requests for common security cookies, so you can understand whether a network request approach will be safe.
Fix broken integrations
We have a browser script at ./integration.ts that is supposed to go to Availity and perform an eligibility check for a patient. But I'm getting a broken selector error when I run it. Fix it. Use the Libretto skill.
Agents can use Libretto to reproduce the failure, pause the workflow at any point, inspect the live page, and fix issues, all autonomously.
CLI usage
You can also use Libretto directly from the command line. All commands accept --session <name> to target a specific session.
npx libretto open <url> # launch browser and open a URL
npx libretto snapshot --objective "..." # capture PNG + HTML and analyze with an LLM
npx libretto exec "<code>" # execute Playwright TypeScript against the open page
npx libretto close # close the browser
Run npx libretto help for the full list of commands.
Configuration
All Libretto state lives in a .libretto/ directory at your project root. See the configuration docs for details on config files, sessions, and profiles.
Join the Community
Join our Discord to connect with other developers, get help, and share what you've built:
packages/libretto/README.template.md — source of truth for the repo and package READMEs
packages/libretto/skills/libretto/ — source of truth for the Libretto skill
Run pnpm sync:mirrors after editing packages/libretto/README.template.md or anything under packages/libretto/skills/libretto/.
To check that generated READMEs, skill mirrors, and skill version metadata are in sync without fixing them, run pnpm check:mirrors. To release, run pnpm prepare-release.
[!NOTE]
This is an early-stage project under active development. APIs may change before version 1.0. We recommend pinning to specific versions in production.
The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
A Claude Code plugin that automatically captures everything Claude does during your coding sessions, compresses it with AI (using Claude's agent-sdk), and injects relevant context back into future sessions.
