[HN]score: 0.34
Cast: Open-Source Access Control Harness for Multi-Agent Systems
June 3, 2026
Cast is a self-hosted, MIT-licensed multi-agent harness that enforces access control via config rather than prompt instructions, preventing models from leaking or overriding permissions. It supports multi-user identity routing and agent-to-agent coordination, running on a Mac Mini with Claude Code integration via three built-in skills.
HOW THIS AFFECTS YOU
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builderYou can replace prompt-based access rules — which models can be argued out of — with config-layer enforcement that the model never sees, directly hardening multi-user agent deployments.