Mainplane, with the biplane flying over the clouds

Mainplane is an open-source agent harness

The Mainplane TUI: a sidebar of sessions on different models, and an agent that moves a Qwen fine-tune from a GPU server to a Mac Studio and quantizes it to run there

Self-Hosting Quickstart

Run this command on your server machine (any always-on machine will do):

# Linux, macOS
curl -fsSL https://mainplane.ai/install | sh -s -- server quickstart

# Windows
& ([scriptblock]::Create((irm https://mainplane.ai/install.ps1))) server quickstart

The quickstart walks you through adding a provider, workers (computers your agents control) and connectors (ways to message your agents).

Features

Model agnostic

Mainplane can use any model from any provider, including Anthropic, OpenAI, Google, and more.

Context efficient

Mainplane agents have a restricted set of tools and manage their own context by retrieving key information from other sessions.

Connects all your devices

The Mainplane Architecture: connectors reach Mainplane Server, which holds secrets and controls, observability and the file server; the network joins the server and every worker

Mainplane links agents and computers with fine-grained security controls. No Tailscale needed.

Shared file drives

Mainplane sets up a remote filesystem you can use concurrently without risk of de-sync.

Browser and computer use

Mainplane drives your real browsers and applications with native computer use.

FAQ

Can I bring my Claude Code, ChatGPT, or OpenCode Go subscription?

Yes, Mainplane can use the regular limits of a Claude Code, ChatGPT, or OpenCode Go subscription.

Does Mainplane share my data?

Your chats are not shared by default. Users can opt in to sharing data to improve Mainplane in /settings.

Do I need more than one device?

No. Everything can run on one device.

Does mainplane-server need Linux?

No. mainplane-server runs on macOS, Windows and Linux. Hosting shared files requires a compatible connected Linux device.

Do you take contributions?

We welcome feedback as GitHub issues. Pull requests are open to collaborators only. Any agent can POST plain text to https://bugs.mainplane.ai to report a bug.