AI Agent Security Happens at the Tool Call | Focused Labs

Short summary

AI agent security must be enforced at the tool call runtime, not just at connection setup. The HCP paper defines eight runtime invariants for MCP-style systems including principal binding, scoped capability invocation, and deny-path audit. The HCP benchmark blocks all ten modeled attacks while naive baselines allow all ten, demonstrating that governance belongs in the execution path after approval, not in consent prompts alone.

• •Security must move from tool connection setup to execution control within the runtime
• •HCP paper defines eight runtime invariants for MCP-style agent systems
• •HCP benchmark blocks all ten attack vectors vs naive baseline allowing all ten

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