AI in Practice: RAG, MCP and Multi-Agent Systems in Kotlin, Without Magic Frameworks

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The model does not decide that. 🛑 The model never executes anything. The model only sees that; the code does the work. val orderId = args. stringArg("order_id") ? : return fail("missing_argument:order_id") // ① val email = args. stringArg("email") ? : return fail("missing_argument:email") val order = orders. findOwned(orderId, email) // ② val late = order. status == OrderStatus. IN_TRANSIT && order. eta < today() // ③ return ok("status" to JsonPrimitive(order. status. wire), "late" to JsonPrimitive(late)) // ④ ① Missing argument? A vague description makes the model pick the wrong tool.

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