Composer is a real-time, multiplayer markdown editor where people and agents can work side-by-side. Instantly share markdown generated by your agent with teammates, edit in real time, leave comments, suggestions, and share context. Your agents join as true collaborators, working directly alongside you and your team.
Hey Product Hunt 👋 I’m Jesse, co-founder of Composer.
Agentic workflows today are mostly focused on written documents. These same workflows also feel like they are mostly solitary. The hard part isn't writing a document, it's shaping it *together*. Our agents write everything, including the wrong things. Then, when you’re ready to share what you’ve done with others, you have to copy results over to a shared space, sending screenshots, committing to a repository, or chatting about what you did. There’s no straightforward way for people and agents to work together in real-time.
That’s why we created Composer.
How it works: - Composer is all Markdown under the hood. - Markdown docs can be shared directly from your coding agent session. - Agents have full document access via MCP and can reply to comments and post suggestions. - Supports real-time collaboration and access controls with both people and agents. Document versioning is coming soon!
Here’s how teams are already using Composer: - Quickly shape a plan together before you start implementation. - Use comments and suggestions to quickly iterate with your agent on document content. - Easily share and collaborate in Markdown without losing shared context.
We can't wait to hear your feedback! We're working hard to iteratively polish the product and your perspectives will help us make Composer the best it can be.
"For a tool like this the magic only really lands once the second collaborator (human or agent) shows up in the doc. Do you have a sense yet of which activation moment predicts a team sticking around? First shared doc, first agent comment, something else?"
Very cool, I've been needing a tool like this recently! Too much text to write and neither markdown files in GitHub or Google Docs are the right way to do it.
Congrats on the launch! I think it's super interesting to collaborate with your agent within the doc itself. It's been surprisingly useful to just send a .md to composer and brainstorm against a specific paragraph. This seems to be a good way to collab on an org wide skill.
How do you handle the history and undo section when both humans and agents are editing at the same time?
It feels like we're moving from documentation written for humans to documentation written for both humans and agents.
Are you seeing teams structure information differently once they know agents will be consuming it alongside people?
Agent collaboration gets interesting when suggestions and comments carry the agent’s assumptions.
In a shared doc, I’d want each agent edit to answer: what source/context did you use, what did you infer, and what should a human verify? Real-time CRDT solves edit collision, but teams will also need confidence/provenance collision when humans and agents disagree.
Are you planning per-suggestion source trails or decision history as versioning lands?
the gap between 'ai generated this document' and 'now the team needs to edit it together' is where everything gets messy. copy paste into google docs, lose formatting, lose context. agents and humans editing in the same doc in real time makes sense
The "and your agents" part is what I want to understand better. Most multiplayer doc tools bolt on an AI layer that can read and maybe append, but real agent collaboration means handling conflicts when an agent edits something a human is mid-way through. How does Composer resolve that? And are agents operating on the same CRDT or OT layer as human cursors, or is agent writes handled separately and merged in?
About Composer on Product Hunt
“Multiplayer markdown for you, your team, and your agents.”
Composer launched on Product Hunt on June 3rd, 2026 and earned 118 upvotes and 27 comments, placing #11 on the daily leaderboard. Composer is a real-time, multiplayer markdown editor where people and agents can work side-by-side. Instantly share markdown generated by your agent with teammates, edit in real time, leave comments, suggestions, and share context. Your agents join as true collaborators, working directly alongside you and your team.
Composer was featured in Productivity (653.8k followers), Notes (8.3k followers) and Artificial Intelligence (471k followers) on Product Hunt. Together, these topics include over 243.2k products, making this a competitive space to launch in.
Who hunted Composer?
Composer was hunted by Jesse Litton. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Composer stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Jesse Litton
Hey Product Hunt 👋 I’m Jesse, co-founder of Composer.
Agentic workflows today are mostly focused on written documents. These same workflows also feel like they are mostly solitary. The hard part isn't writing a document, it's shaping it *together*. Our agents write everything, including the wrong things. Then, when you’re ready to share what you’ve done with others, you have to copy results over to a shared space, sending screenshots, committing to a repository, or chatting about what you did. There’s no straightforward way for people and agents to work together in real-time.
That’s why we created Composer.
How it works:
- Composer is all Markdown under the hood.
- Markdown docs can be shared directly from your coding agent session.
- Agents have full document access via MCP and can reply to comments and post suggestions.
- Supports real-time collaboration and access controls with both people and agents. Document versioning is coming soon!
Here’s how teams are already using Composer:
- Quickly shape a plan together before you start implementation.
- Use comments and suggestions to quickly iterate with your agent on document content.
- Easily share and collaborate in Markdown without losing shared context.
Check it out at: https://usecomposer.md
We can't wait to hear your feedback! We're working hard to iteratively polish the product and your perspectives will help us make Composer the best it can be.
Let us know what you think!
Jesse