Developer Builds Zero-Trust Security Layer for Multi-Agent AI Systems Using Gemini and HMAC

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A developer created a security framework called the Fortified Enterprise Agent Fleet to address privilege escalation risks in multi-agent AI architectures, submitting it to Google's All Things Agentic Hackathon. The system uses zero-trust principles to ensure that permissions can only narrow — never expand — as tasks are delegated from an orchestrator agent down to specialized worker agents. A Blast-Radius Firewall intercepts each delegated task and assigns a risk score based on the severity of the requested action, blocking and quarantining unauthorized operations instantly. Every delegation event, whether approved or blocked, is cryptographically signed using HMAC-SHA256 to create tamper-evident audit logs that can detect post-hoc manipulation. The stack is built on Gemini 1.5 Flash, Google's Agent Development Kit, and Google Cloud Run.

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