I built something very similar for my company internally. The idea was that that the maintenance of the code is on the agent and the code is purely an optimization. If it breaks the agent runs it iteratively, fixes the code for next time. Happy to replace my tool with this and see how it does!
Super cool! Please let me know how it goes. Since agents are so good at writing code, we think letting the agent rewrite/test the code on failure is better than just using a prompt at runtime
It's a good callout. We have a BAA + ZDR with Anthropic and OpenAI, and if you want to use libretto for healthcare use cases having a BAA is essential. Was using Codex in the demo, and we've seen that both Claude and Codex work pretty well
The network-request-first approach is the right call. DOM parsing is fragile because it's scraping a rendering artifact — any style refactor, framework upgrade, or A/B test can silently break it. Intercepting the actual API calls the browser is already making is closer to testing the contract, not the presentation.
The healthcare context makes this especially sharp. Those portals are notoriously inconsistent and rarely built for automation. Would be curious how you handle cases where the app uses WebSockets or chunked responses instead of clean REST calls.
Right now libretto only captures HTTP requests, which the coding agent can use to determine how to perform the automation.
For more complex cases where libretto can't validate that the network approach would produce the right data (like sites that rely on WebSockets or heavy client-side logic) it falls back to using the DOM with playwright
Thanks for this! We have clear answers for things that are 100% and 0% automated, but it’s always that 80%-99% automated slice where the frontier is, great idea.
script maintenance is exactly where that middle slice bites - the app keeps evolving and the scripts lag behind. we took the angle of having the agent re-explore from scratch each run with autonoma (https://github.com/autonoma-ai/autonoma) for e2e qa, no maintained scripts, adapts naturally - different goal than libretto but same core intuition
At its core, libretto generates, validates, and helps with debugging RPA scripts. As far as I understand tools like playwright CLI are more focused on letting your agent use playwright to perform one-off automations.
The implementation is also pretty different:
- libretto gives your agent a single exec tool (instead of different tools for each action) so it can write arbitrary playwright/javascript and is more context efficient
- Also we gave libretto instructions on bot detection avoidance so that it will prefer using network requests for automation (something that other tools don’t support), but will fall back to playwright if it identifies network requests as too risky
Cool. Thank you for sharing. While AI tools are extremely powerful, packages like this help create some good standards and stepping stones for connectivity that the models haven’t gotten around to yet. Thanks again.
Lol sorry for the misleading click. We named it libretto after the term in theater, inspired by Playwright. No retro gaming here, just browser automation!
I built something very similar for my company internally. The idea was that that the maintenance of the code is on the agent and the code is purely an optimization. If it breaks the agent runs it iteratively, fixes the code for next time. Happy to replace my tool with this and see how it does!
Super cool! Please let me know how it goes. Since agents are so good at writing code, we think letting the agent rewrite/test the code on failure is better than just using a prompt at runtime
Love it! Do you have a BAA with Claude though? Otherwise, your demo is likely exposing PHI to 3rd parties and exposing you to risk related to HIPAA
It's a good callout. We have a BAA + ZDR with Anthropic and OpenAI, and if you want to use libretto for healthcare use cases having a BAA is essential. Was using Codex in the demo, and we've seen that both Claude and Codex work pretty well
The network-request-first approach is the right call. DOM parsing is fragile because it's scraping a rendering artifact — any style refactor, framework upgrade, or A/B test can silently break it. Intercepting the actual API calls the browser is already making is closer to testing the contract, not the presentation.
The healthcare context makes this especially sharp. Those portals are notoriously inconsistent and rarely built for automation. Would be curious how you handle cases where the app uses WebSockets or chunked responses instead of clean REST calls.
Right now libretto only captures HTTP requests, which the coding agent can use to determine how to perform the automation.
For more complex cases where libretto can't validate that the network approach would produce the right data (like sites that rely on WebSockets or heavy client-side logic) it falls back to using the DOM with playwright
Thanks for this! We have clear answers for things that are 100% and 0% automated, but it’s always that 80%-99% automated slice where the frontier is, great idea.
script maintenance is exactly where that middle slice bites - the app keeps evolving and the scripts lag behind. we took the angle of having the agent re-explore from scratch each run with autonoma (https://github.com/autonoma-ai/autonoma) for e2e qa, no maintained scripts, adapts naturally - different goal than libretto but same core intuition
how does it differ from playwright-cli?
At its core, libretto generates, validates, and helps with debugging RPA scripts. As far as I understand tools like playwright CLI are more focused on letting your agent use playwright to perform one-off automations.
The implementation is also pretty different:
- libretto gives your agent a single exec tool (instead of different tools for each action) so it can write arbitrary playwright/javascript and is more context efficient
- Also we gave libretto instructions on bot detection avoidance so that it will prefer using network requests for automation (something that other tools don’t support), but will fall back to playwright if it identifies network requests as too risky
I've wanted something like this for ages, excited to try this out!
What is the license?
Edit: nevermind. I see from the website it is MIT. Probably should add a COPYING.md or LICENSE.md to the repository itself.
Cool. Thank you for sharing. While AI tools are extremely powerful, packages like this help create some good standards and stepping stones for connectivity that the models haven’t gotten around to yet. Thanks again.
this looks awesome
this is interesting
For a moment I throught it was something about libretro. As an avid RetroArch user the headline picked my interest.
Then I clicked and realized it's just some other AI shit.
Lol sorry for the misleading click. We named it libretto after the term in theater, inspired by Playwright. No retro gaming here, just browser automation!