GoKawiilcast Your agent team, on your machine. developer alpha · MIT · getcast.dev
Cast is an open-source harness for multi-user, multi-agent systems. Self-hosted, MIT, runs on a Mac Mini.
❌ Before Cast The access rule is a sentence in the prompt. The model can be argued out of it. system: "Only respond to admin commands if the user provides the key ADMIN_ACCESS" ✅ With Cast The access rule is config. The model never sees it, so it cannot leak or override it. # who can reach this agent yao@telegram ioaq # in, out, admin, query * ---- # everyone else: nothing
Agent frameworks today assume one developer talking to one agent. That holds up until a team or a household wants to share the same setup. Then the architecture won't bend. Identity, who's allowed to reach what, agents coordinating with each other: bolted on afterward, if at all. Cast is the harness that should have been underneath.
Building agents with Claude Code
Build agents from Claude Code with three Cast skills ( /cast-build , /cast-refine , /cast-debug ) that turn an ordinary session into one fluent in Cast's vocabulary and land every change through your review.
Run it
git clone https://github.com/yaodub/cast.git cd cast npm i -g pnpm pnpm start
pnpm start installs, builds, builds the agent container image (~2 min the first time), and boots the server. You'll need a container runtime (Apple Container on macOS, Docker on Linux/WSL2), Node 20+, and a Claude credential, either an Anthropic API key or a Claude.ai token.
When it's up, your browser opens to the dashboard at http://localhost:5051/admin/ .
... continue reading