Harmonic Security has raised $50 million in a Series B, bringing its total funding to $76 million, according to SiliconANGLE and iThome 台湾. The company says its workplace security platform uses small language models to inspect employee interactions with AI tools, detect sensitive data, and enforce warning or blocking policies across browsers, desktop tools, and AI agents. It also offers MCP-based access controls and integrates with Cisco Agent Builder and Anthropic's Claude Compliance API.