About Composer
Overview
Composer is a real-time, multiplayer markdown editor where people and AI agents write together in one shared document. The markdown an agent produces lands directly in the live doc, where the whole team edits, comments, and refines it together.
Composer connects to your agent over MCP, the Model Context Protocol, an open standard that lets an agent read from and write to a shared document. Agent output becomes collaborative content for your team instead of staying private to one person.
Key Benefits
- Real-time collaboration: teammates edit the same markdown document simultaneously.
- Agent collaboration: your AI agent joins documents as a true collaborator over MCP.
- Comments and suggestions: teammates leave feedback on agent-written content in place.
- Plain markdown portability: documents remain readable in other editors.
- Shared live documents: agent output lives where the team works, not in a separate tool.
How It Works
First, connect Composer to your AI agent over MCP. The agent then reads from and writes to a shared Composer document, so its markdown lands in a document your whole team can open, edit, comment on, and refine together in real time.
Why Choose This Product
Composer differentiates itself from Notion, Google Docs, and Obsidian by combining real-time multiplayer editing, plain markdown, and a bring-your-own-agent model. Your agents join with your chosen context and share their output with your team over MCP in a single editor, keeping the document at the center of the work.
Composer Pros & Cons
- Real-time multiplayer editing for the whole team
- Agents join documents as collaborators over MCP
- Documents remain portable plain markdown
- Built-in comments and suggestions for feedback
Key Features
Real-time editing
Multiple people edit the same markdown document simultaneously, with changes appearing live.
Comments and suggestions
Team members leave comments and suggestions directly on agent-written markdown in the shared document.
Agent collaboration
AI agents connect over MCP and join documents as true collaborators rather than external tools.
MCP connectivity
The Model Context Protocol lets an agent read from and write to a shared Composer document.
Plain markdown docs
Documents are stored as plain markdown, so they stay readable in other editors when opened elsewhere.
Frequently asked questions about Composer
What is Composer?
Composer is a real-time, multiplayer markdown editor where people and agents work side by side. Your agent shares the markdown it writes into a live document, and your whole team edits, comments, and refines it together.
How do agents collaborate in Composer?
Agents connect over MCP and join documents as true collaborators. The markdown an agent writes lands in a shared document that your whole team can edit, comment on, and refine together in real time.
What is MCP, and what does it do in Composer?
MCP, the Model Context Protocol, is the open standard that lets an agent read from and write to a shared Composer document, so agent output becomes collaborative content for your team instead of just for you.
How is Composer different from Notion, Google Docs, or Obsidian?
Composer combines real-time multiplayer, plain markdown, and a bring-your-own-agent (BYOA) model, so your agents can join as collaborators with your chosen context and share it with your team over MCP in a single editor. The document stays at the center, with true collaboration.
Can I open my Composer documents in other apps?
Yes. Composer works in plain markdown, so your documents stay readable in other editors when you open them elsewhere.
What platforms does Composer support?
Composer is available on: Web.