Cast is an open-source framework designed to enable multi-user, multi-agent systems centered around Claude models. Developed by yaodub, it addresses a critical gap in agent frameworks that traditionally cater to single developers. By allowing multiple users to interact with shared agents, Cast introduces a novel approach to identity management and access control. The system runs entirely self-hosted, requiring only a Mac Mini and a Claude credential, making it accessible for teams or households seeking collaborative agent workflows.

The technical architecture of Cast centers on containment and routing. Agents exist as isolated folders under `~/.cast/agents/`, with extensions like email or calendar integrations handling specific tasks. Users configure access rules through prompts—such as restricting admin commands to those with `ADMIN_ACCESS`—ensuring security without exposing sensitive parameters to the model. This separation of configuration from model input prevents leaks or overrides. The dashboard, accessible via `localhost:5051`, guides users through agent creation, from describing a task in plain English to deploying it with team-specific permissions. Built on Claude Code, Cast includes specialized commands like `/cast-build` to streamline development, though its developer alpha status means some features remain unstable.

Practical implementation requires technical setup: cloning the repository, installing dependencies, and configuring a container runtime. While the tool is MIT-licensed and welcomes contributions, its current state is still in alpha. For developers, Cast represents a shift toward decentralized agent collaboration, moving beyond the one-to-one developer-agent model. Its ability to manage shared workflows with enforceable access rules could redefine how teams coordinate complex tasks using AI agents.