Introducing Proof

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If you use AI seriously to think or work, a surprising share of your documents are probably already written by agents.

Most of us at Every are using Codex to generate plan documents, Claude Cowork to write research reports, and OpenClaws to create strategy memos. But the current process for collaborating and iterating on agent-generated writing is weirdly primitive. It mostly takes place in Markdown files on your laptop, which makes it reminiscent of document editing in 1999.

Because these documents are stuck on your laptop, it’s hard for other agents to help iterate on them—and they’re hard to show to your team, too.

That’s why today we’re officially launching Proof, an online document editor built for agents and humans to collaborate. Fast, free, and no login required. (And it’s open source!)

What is Proof?

Most word processors still assume a human is doing the writing and AI is helping at the margins for brainstorming, making rewrite suggestions, or producing a first draft. Proof flips that around. It’s a document editor built for the kinds of documents agents are increasingly writing: bug reports, product requirement documents, implementation plans, research briefs, copy audits, strategy documents, memos, and proposals.

It supports live edits with multiple collaborators, allows you to see and leave comments, and lets you track changes.

But it also has what you would expect of a document editor built for agents. Proof:

1. Is agent-native: Anything you can do in Proof, your agent can do just as easily.
2. Tracks provenance: A colored rail on the left side of every document tracks who wrote what. Green means human, purple means AI.
3. Is login-free and open-source: We want Proof to be your agent’s favorite document editor.

You can try it yourself right now. Give the prompt below to your agent of choice and have it generate a Proof document for you.

Try Proof with your agent

Send your agent this link:

It will ask them to write a Proof document describing what they’ve learned about how to work with you best. You’ll get a Proof link with their insider’s perspective on your work style.

How we use Proof at Every

We’ve been using Proof internally for over a month and, a couple of weeks ago, opened it up to Every subscribers as an experiment. Internally, we’ve found that plans, like the ones generated when Claude Code or Codex maps out a new feature for a product, are the most common type of Proof document, along with strategy documents.

Austin Tedesco, Every’s head of growth, whose job involves writing a lot of campaign strategy documents, might go back and forth on the drafts with one or more agents. When the document feels ready, he’ll send it to the rest of the team on Slack for feedback.

Austin also uses Proof for his own writing. He sends notes for his food newsletter throughout the week to his Claw, which organizes them in a Proof document and generates an outline, so that when he sits down to write, everything is already in front of him.

I use Proof documents as my daily to-do lists. I pin the page for that day in my Slack account, and anytime a new task pops up for me to do, I’ll tell my Claw, R2-C2, to add it to the document in the appropriate section. At the end of the day, I can see which tasks I’ve completed and which I haven’t, and I can tell my agent to either push my incomplete tasks to the next day, help figure out how to complete them, or just go ahead and do them for me.

Our editorial team is also exploring how to integrate Proof into their AI workflow. The initial outline and draft of this post started in Proof.

What’s available at launch

Today, Proof is available to everyone, for free, even if you don’t have an Every account. Those who do sign in with an Every account have access to a continually updating library with all of the Proof documents they’ve created.

And it’s the first one of our products to be open-source, so that anyone can inspect it, build on it, and help shape where it goes next.

Try Proof

Most of the writing that will happen in the next decade will be generated by AI agents. Now they have a document editor built for them.

Watch me talk about Proof with Every’s Brandon Gell, Kieran Klaassen, and Austin Tedesco on X or YouTube, or listen on Spotify or Apple Podcasts on the latest episode of AI & I. You can also read the full transcript.

Dan Shipper is the cofounder and CEO of Every, where he writes the Chain of Thought column and hosts the podcast AI & I. You can follow him on X at @danshipper and on LinkedIn, and follow Every on X at @every and on LinkedIn.

We build AI tools for readers like you. Write brilliantly with Spiral. Organize files automatically with Sparkle. Deliver yourself from email with Cora. Dictate effortlessly with Monologue.

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