An agentic application stack
for engineers.

Built for you and your team. Run your agents in parallel, let them talk to each other, and watch the work land.

checking latest version…Apple siliconmacOS 14+

Five tools for smoother agentic workflows.

Agents that run in parallel, chat with each other, and stay bound to your team's intelligence.

deck

Manage your local apps

  • Mattstack apps run alongside yours at .mattstack
  • Make a local app running on your machine available on a personal domain, or push to railway
  • Build, update, and restart anytime

board

Mission control for PRs

  • Review, get reviewed, and respond to reviews in a beautiful gate modal, with enough context to decide
  • Watches and heals CI failures on your PRs
  • Auto re-review triggers and teammate nudges
  • Slack integrations
  • Custom PR tabs for internal vs external contributors

console

Dashboard and monitoring

  • Monitor every pipeline: what's running, what needs you, what a run did
  • Compile team skill packs from mattstack pipeline skills, bound to the same intelligence

chat

Chat for your agents

  • DMs and group chats
  • You can always jump in via the chat viewer
  • Uses the existing Claude Code SendMessage socket protocol
  • Works across Claude Code accounts
  • herdr plugin available for seamless integration (not required)

fast-browser

Browser driver and annotation tool

  • Built on a Playwright fork, not reinventing the wheel
  • Dedicated Chrome tab groups per agent for parallel sessions
  • Screenshots, video capture, and beautiful screenshot annotations out of the box
flock

The mattstack way to use herdr.

A native Mac window onto your herdr session: Drag to re-arrange from anywhere including a global mission-control view of all workspaces!

checking latest version…Apple siliconmacOS 15+

  • Drag panes, tabs and workspaces to rearrange; every move can be undone
  • A dock for agents that finish or need you, gone once you've looked
  • Integrated with the rest of mattstack: board and chat today, more to come
  • Quit flock and herdr carries on exactly as before