Give your collaborator hands.
Your collaborator already lives in space. Already reaches your machines. Already remembers. The hands come next. The full toolkit — every tool you can reach, every protocol you can speak, every machine you can touch. We're putting the finishing touches on it.
The toolkit is open source today. The integrated experience is on the way.
What your collaborator can reach for.
The hands are the operations layer. The toolkit is what the hands pick up.
200+ tools your collaborator can reach.
A library of specialized assistants — code analysis, creative workflows, research, the kind of work that needs a second pair of hands. Each one callable through your collaborator.
Premium MCP servers.
Curated, production-grade servers that extend your collaborator beyond the standard toolkit. Each one a door to a new craft.
A fleet that works while you sleep.
Schedule, chain, and orchestrate complex workflows. Set them in motion. They run. You wake up to results.
The API is yours.
Build custom integrations. Wire Rainline into your own apps and automations. The collaborator is the surface; the API is the scaffold.
Direct line to the people building it.
Priority help from the team that’s building Rainline. Your collaborator has a question; we’re there to answer it.
Coming home.
Right now the toolkit lives at rainfall-devkit.com. Soon it lives inside Rainline — native, integrated, one surface. We’re putting the finishing touches on it.
The companion is already yours.
You already have your collaborator. The companion is free, on your machine, yours forever. The hands — edge nodes, a fleet, always-on work — those are the operations layer. They connect to the same toolkit. The toolkit is the same either way.
The open-source engine.
The hands live in the operations layer. rainfall-devkit is the open-source engine that powers them — the asynchronous runtime, the tool-calling protocol, the scheduler that wakes your collaborators when it matters. You're not buying a black box. You're extending open code.
Can I self-host the hands?
Yes. The core rainfall-devkit engine is open source and can run locally or on your own infrastructure. The hands are the operations layer — they extend reach beyond your machine. Run your own cloud, or let us run them.
Do I need the hands to build tools?
No. You can build custom MCP tools and local integrations with the companion. The toolkit gives you the full catalog of ready-made, production-grade tools.
What happens if I let the hands go?
Your collaborator stays — the companion, the surface, the memory, all of it, free, forever. The hands pause. The work that was reaching outward reaches inward again, until you want it to reach again.
Begin.
Your collaborator is free. The hands are when you want them. The companion lives on your machine. The work reaches outward when you let it.
The hands live in the operations layer. The companion lives on your machine. Free.