Libretto
Open-source browser automation for coding agents — recording CLI, self-healing debug agents, and a low-token Browser Tools SDK
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libretto.shAbout Libretto
Libretto builds browser automation tooling for both humans and AI agents, spanning a CLI, an SDK, debugging agents, and cloud browsers. The open-source CLI records website workflows — `npx libretto open` starts a session, captures your actions and the underlying network traffic, and writes them out as fast, reusable Playwright scripts that live in your codebase rather than in a vendor's dashboard. The Debug Agents product handles the part everyone hates: when a Playwright automation breaks, an agent inspects the live page, works out what changed (a renamed field, a moved selector), and opens a pull request with the fix instead of leaving a red build for a human to triage. The Browser Tools SDK is the agent-facing piece — six tools that let any AI agent drive a real browser through Playwright, with adapters for the AI SDK, Pi, and MCP. Its design keeps token cost down: `browser_snapshot` returns a compact accessibility tree with stable refs rather than raw HTML, and `browser_exec` runs Playwright code on the live page and returns only a snapshot diff of what changed. Libretto publishes benchmarks for this — across 26 tasks on public websites, it measured $0.106 per outcome against $0.257 for dev-browser, $0.235 for agent-browser, and $0.293 for playwright-cli, roughly 55% cheaper than the alternatives. It supports Kernel, Browserbase, and local browser providers.
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Key Features
Libretto Pros & Cons
✅ Pros
- +Published benchmark showing ~55% lower cost than comparable agent browser harnesses
- +Core CLI and SDK are open source with no account required
- +Self-healing PRs address the real maintenance cost of browser automation
- +Scripts live in your repo, not a vendor dashboard
⚠️ Cons
- −No published pricing for the hosted Debug Agents and cloud browser products
- −Several framework adapters are still marked coming soon
- −Benchmarks are vendor-run, not independently reproduced
- −Assumes Playwright familiarity to get real value from the CLI output
Who Is Libretto Best For?
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