dev.to 04/01/2026 23:21

AI Agents: Mastering 3 Essential Patterns (Reflexive). Part 3 of 3

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The code for these patterns is available on Github. [Repo] The Reflexive Pattern – When There's No Time to Think In Article 2 (ReAct), we turned our agent into a meticulous "Investigator." The guy would sit down, analyze, plan, Google search, and then answer. That's great for complex tasks, but it has a huge bug in the real world: it's slow. Think of it this way: if you touch a hot stove, your brain doesn't start a debate: "Hmm, I detect a temperature of 200°C, this will cause protein denaturation, I suggest moving the biceps...". Haha, no. Your spinal cord takes command and pulls your hand away before you even feel the pain. The Reflexive Pattern (sometimes called Semantic Router) is exactly that: the "reflex action" of Artificial Intelligence. The Use Case: The Security Sentinel To understand this, imagine we build a system that reads your server logs in real-time. Among thousands of normal visits, suddenly this comes in: "GET /search?q=' OR 1=1;--" If you use a ReAct agent here, you're dead. The agent would think: "Wow, an unusual pattern. I'm going to use the search tool to understand what 'SQL Injection' is. Ah, I see it's dangerous. Proceeding to block." By the time it finished "thinking" that (10-15 seconds), your database is already leaked on the Dark Web. Here is where the Reflexive Agent shines: Stimulus: Sees the malicious string. Reflex: Executes block_ip(). Time: < 1 second. No doubts. No loops. Pattern Anatomy: Cutting the Red...
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