VibeGate: Blocking Agent Tool Attacks | Strands SDK + Amazon Nova

VibeGate is an execution-time security gate for AI agents. This demo connects Amazon Bedrock Nova 2 Lite with the Strands Agents SDK and tests controlled GitHub prompt-injection and MCP scenarios. When Nova proposes a restricted tool action, VibeGate evaluates it through BeforeToolCallEvent and cancels it before dispatch. Protected-path evidence: • Restricted tool executions: 0 • Synthetic data received: 0 bytes • Reproducible GitHub source pinned to a verified AgentDojo commit • Controlled local MCP test environment • No real credentials or private data used Source code: https://github.com/jiarong0423/vibegate-se... Built for the Agents for Humans hackathon.