The AI-native product document.
A brief is the central document for any project — capturing goals, requirements, and context in one place. Write it once, and every plan, task, and agent run derives from it.
Writing
A full editor, with AI built in.
Write in a rich document editor with real-time AI assistance in the side panel. Ask questions, request rewrites, or let the AI expand a rough idea into a full brief section. Collaborative cursors show your teammates working alongside you.
Context
Attach everything the AI needs.
Drop in files, paste URLs, or link documents from Google Drive or Notion. Hamster reads and indexes every attachment — so when you ask a question or generate a plan, the AI is working from your actual research, not a blank slate.
Alignment
Know when the team is aligned.
The activity timeline shows who has reviewed the brief, who has raised concerns, and how readiness is tracking across the team. Alignment happens in the brief — not in a separate meeting or Slack thread.
Key capabilities
- Real-time collaborative editing with live cursors
- AI assistant in the editor side panel
- Brief status lifecycle (Draft → In Review → Ready)
- File and URL attachments indexed for AI context
- Team alignment votes and readiness tracking
- Document versioning — restore any earlier version
- @mention teammates anywhere in the document
- Share briefs with specific team members
Works with
Plans — Generate a full task breakdown from any brief with one click.
Blueprints — Briefs inherit context from your team's organizational knowledge.
Connections — Attach context from GitHub, Linear, Notion, and more.
Background Agents — Agents read the brief when executing tasks.
Write your first brief.
Free to start. No credit card required.