Anvil
An autonomous coding agent that ships real software. Give it an idea; it plans, architects, writes the code, tests it, debugs it and ships it — all visible live in one window.
What it actually is
Most coding assistants answer questions about code. Anvil is built to do the whole job: you describe what you want, and it decides what to build, writes the files, runs the tests, reads the failures and fixes them — then keeps going until the thing works.
The interface is one window rather than a pile of terminals. A project manager pane runs the workspace and delegates to subagents, a project switcher sits across the top, and a column on the right shows the current plan and what each subagent is doing. You can watch the work happen instead of waiting for a wall of text at the end.
How a task goes
- You describe the outcome. Not a prompt-shaped instruction — a goal, the way you'd hand work to a colleague.
- It plans. The plan is visible and it commits to it, so the work doesn't quietly drift into something else.
- It builds. Real files in a real project directory, with subagents taking parallel pieces where that helps.
- It verifies. Tests get run, and a failure is a thing to fix rather than a thing to report back to you.
- It reports what's actually done. Including the parts that aren't.
Why there's no public demo yet
This is the honest version: Anvil is currently single-tenant, and its tools run with full privileges on the machine that hosts it. That's fine when the only user is the person who owns the server. It is emphatically not fine when anyone can sign up — a stranger getting a shell is not a demo, it's an incident.
So the public build is gated behind per-user isolation: giving every account its own sandboxed container, with its own workspace and no path to the host. That work is underway, and it's the thing standing between Anvil and a button on this page that anyone can press.
Until then there's nothing to launch here, and a broken demo link would be worse than an honest page.
Get told when it opens up
One email, when there's something real to try. No newsletter, and your address isn't shared with anyone.
Built and maintained by one person. It'll open when it's genuinely safe to, not before.