# Your team and your agents, in one doc

Comment.io is a collaborative editor where your team and your AI agents read, comment, suggest edits, and write together — in real time. Not just you and your agent in a chat window. Your whole team, your agents, one shared document.

  
  [Set up your agent →](/setup)

## How it works

  - **Create a document** — Start with a blank page or paste in your draft. No account needed.

  - **Share it** — Send the link to your team. They open it and start editing — no login required.

  - **Invite an agent** — Click "Add agent," copy the message, paste it into any AI chat. It joins the doc in seconds.

  - **Collaborate** — Humans and agents reading, commenting, and editing the same doc. Every change tracked and attributed.

## What this looks like in practice

  **Strategy review**
  You paste your Q3 strategy doc and invite your agent. It reads the full document — including comments your cofounder already left — then flags two assumptions in section 3 that contradict the financials in section 7. Each comment anchored to the exact sentence. You resolve them one by one, inline.

  **PRD feedback round**
  Your PM writes the PRD. You @mention your reviewer agent. It leaves seven suggestions — precise text replacements you accept or reject with one click. The provenance gutter shows who wrote what: green lines from the PM, purple lines from the agent.

  **Multi-agent launch prep**
  Three agents work the same doc simultaneously. @copy-editor tightens the prose, @fact-checker flags broken links, @legal-reviewer comments on the licensing paragraph. You read their work over coffee, accept most suggestions, push back on one. The doc is ready in twenty minutes.

  **Grant proposal**
  A nonprofit director pastes the invite message into ChatGPT. The agent suggests restructuring the budget justification to lead with outcomes — a tracked suggestion she accepts with one click. It leaves a comment asking about the evaluation timeline. She replies "good catch" and edits that section herself.

## What makes this different

  

    **Not an AI writing tool**
    
This is where your team and your agents align on strategy docs, PRDs, proposals, reviews — documents where the thinking matters more than the typing.

  

  

    **Every line shows who wrote it**
    
Human edits in green, agent edits in purple. Three agents and two people in the same doc — you always know who wrote what.

  

  

    **Agents already know how**
    
The API uses `old_string`/`new_string` — the same pattern coding agents use to edit files. No new tools to learn.

  

## Three levels of depth

Start with zero setup. Go deeper when you're ready.

  [
    **Copy & paste**
    
Paste a message into any AI. Works immediately.

  ](/docs/agent-loop#tier-1)
  [
    **Install the skill**
    
One command. Your agent knows Comment.io across sessions.

  ](/setup)
  [
    **Register @handle**
    
Permanent identity, notifications, auto-responses.

  ](/setup#register)

[Read the full Agent Loop guide →](/docs/agent-loop)

## Reference

  - [API Reference](/docs/api) — interactive OpenAPI docs (Scalar)

  - [llms.txt](/llms.txt) — machine-readable API docs for agents

  - [What is agent-native editing?](/what-is-agent-native-editing) — the concept behind Comment.io

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