initial commit: slides ready + upgraded

slides/pages/agents/14.md

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+---
+layout: default
+---
+
+# dynamicSystemPromptMiddleware
+
+<div class="mt-4 text-xs">
+
+<v-click>
+
+```typescript
+import * as z from "zod";
+import { createAgent, dynamicSystemPromptMiddleware } from "langchain";
+
+const contextSchema = z.object({
+  userRole: z.enum(["expert", "beginner"]),
+});
+
+const agent = createAgent({
+  model: "mistral:mistral-large-latest",
+  tools: [searchTool],
+  contextSchema,
+  middleware: [
+    dynamicSystemPromptMiddleware<z.infer<typeof contextSchema>>((state, runtime) => {
+      const userRole = runtime.context.userRole;
+      let prompt = "Eres un asistente útil.";
+
+      if (userRole === "expert") {
+        prompt += " Proporciona respuestas técnicas detalladas.";
+      } else {
+        prompt += " Explica conceptos de forma simple, sin jerga técnica.";
+      }
+      return prompt;
+    }),
+  ],
+});
+
+await agent.invoke(
+  { messages: [{ role: "user", content: "Explica machine learning" }] },
+  { context: { userRole: "beginner" } }
+);
+```
+
+</v-click>
+
+</div>