macOS 26.3.1 introduces a bug that breaks supplemental DNS resolution for custom TLDs in the /etc/resolver/ configuration. This issue is a regression from the previous version, macOS 25.x 26.3.0, which functioned correctly.

Agent Safehouse provides macOS-native sandboxing for local agents, ensuring that they operate without affecting the broader system. The sandboxing mechanism restricts access to user permissions, allowing agents to run safely while preventing any unintended consequences.