Lead · Agent Fundamentals
An AI Agent's LLM doesn't actually execute any tool — it only outputs 'I want to do this' requests; your backend code does the real execution. This design is the foundation of all security: the execution layer is under your control, and security validation is added there. How well tools are designed determines whether an Agent can be trusted.
Alex Mercer
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June 17, 2026
The most core capability of an AI Agent isn't 'thinking' — it's 'acting.' Thinking is just the LLM's text prediction; acting is the mechanism that connects the Agent to the real world. Tool Use is how this mechanism is implemented — it defines how an Agent issues a request saying 'I want to do something,' how an external system executes it, and how the result comes back to influence the...