Show HN: ProofShot – Give AI coding agents eyes to verify the UI they build

https://proofshot.argil.io/

20•jberthom•1h ago

I use AI agents to build UI features daily. The thing that kept annoying me: the agent writes code but never sees what it actually looks like in the browser. It can’t tell if the layout is broken or if the console is throwing errors.

So I built a CLI that lets the agent open a browser, interact with the page, record what happens, and collect any errors. Then it bundles everything — video, screenshots, logs — into a self-contained HTML file I can review in seconds.

proofshot start --run "npm run dev" --port 3000 # agent navigates, clicks, takes screenshots proofshot stop

It works with whatever agent you use (Claude Code, Cursor, Codex, etc.) — it’s just shell commands. It's packaged as a skill so your AI coding agent knows exactly how it works. It's built on agent-browser from Vercel Labs which is far better and faster than Playwright MCP.

It’s not a testing framework. The agent doesn’t decide pass/fail. It just gives me the evidence so I don’t have to open the browser myself every time.

Open source and completely free.

https://github.com/AmElmo/proofshot

Comments

Imustaskforhelp•52m ago

Great to see this but exe.dev (not sponsored but they are pretty cool and I use them quite often, if they wish to sponsor me that would be awesome haha :-]) actually has this functionality natively built in.

but its great to see some other open source alternatives within this space as well.

Horos•49m ago

what about mcp cdp ?

my claude drive his own brave autonomously, even for ui ?

VadimPR•48m ago

Looks nice! Does it work for desktop applications as well, or is this only web dev?

zkmon•46m ago

Taking screenshots and recording is not quite the same as "seeing". A camera doesn't see things. If the tool can identify issues and improvements to make, by analyzing the screenshot, that's I think useful.

jofzar•32m ago

> It’s not a testing framework. The agent doesn’t decide pass/fail. It just gives me the evidence so I don’t have to open the browser myself every time.

From the OP, i don't think this is what is meant for what you are saying.

falcor84•12m ago

I read it in the same vein as saying that a sub's sonar enables "seeing" its surroundings. The focus is on having a spatial sensor rather than on the qualia of how that sensation is afterwards processed/felt.

philipp-gayret•8m ago

> If the tool can identify issues and improvements (...)

Tools like Claude and the like can, and do. This is just a utility to make the process easier.

theshrike79•45m ago

What does this do that playwright-cli doesn't?

https://github.com/microsoft/playwright-cli

jofzar•33m ago

These aren't really comparable, OP's is something that records, captures and reproduces with steps.

mohsen1•10m ago

playwright can do all of that too. I'm confused why this is necessary.

If coding agents are given the Playwright access they can do it better actually because using Chrome Developer Tools Protocol they can interact with the browser and experiment with things without having to wait for all of this to complete before making moves. For instance I've seen Claude Code captures console messages from a running Chrome instance and uses that to debug things...

lastdong•37m ago

This is basically what antigravity (Google’s Windsurf) ships with. Having more options to add this functionality to Open code / Claude code for local models is really awesome. MIT license too!

can16358p•29m ago

How would this play with mobile apps?

I'd love to see an agent doing work, then launching app on iOS sim or Android emu to visually "use" the app to inspect whether things work as expected or not.

jofzar•28m ago

I'm going the opposite of everyone else is saying.

This is sick OP based on what's in the document, it looks really useful when you need to quickly fix something and need to validate the changes to make sure nothing has changed in the UI/workflow except what you have asked.

Also looks useful for PR's, have a before and after changed.

z3t4•19m ago

I'm currently experimenting with running a web app "headless" in Node.JS by implementing some of the DOM JS functions myself. Then write mocks for keyboard input, etc. Then have the code agent run the headless client which also starts the tests. In my experience the coding agents are very bad at detecting UX issues, they can however write the tests for me if I explain what's wrong. So I'm the eye's and it's my taste, the agent writes the tests and the code.

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