first commit

apps/cli/src/application/entities/message.ts

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+import { z } from "zod";
+
+export const TextPart = z.object({
+    type: z.literal("text"),
+    text: z.string(),
+});
+
+export const ReasoningPart = z.object({
+    type: z.literal("reasoning"),
+    text: z.string(),
+});
+
+export const ToolCallPart = z.object({
+    type: z.literal("tool-call"),
+    toolCallId: z.string(),
+    toolName: z.string(),
+    arguments: z.string(),
+});
+
+export const AssistantContentPart = z.union([
+    TextPart,
+    ReasoningPart,
+    ToolCallPart,
+]);
+
+export const UserMessage = z.object({
+    role: z.literal("user"),
+    content: z.string(),
+});
+
+export const AssistantMessage = z.object({
+    role: z.literal("assistant"),
+    content: z.union([
+        z.string(),
+        z.array(AssistantContentPart),
+    ]),
+});
+
+export const SystemMessage = z.object({
+    role: z.literal("system"),
+    content: z.string(),
+});
+
+export const ToolMessage = z.object({
+    role: z.literal("tool"),
+    content: z.string(),
+    toolCallId: z.string(),
+    toolName: z.string(),
+});
+
+export const Message = z.discriminatedUnion("role", [
+    AssistantMessage,
+    SystemMessage,
+    ToolMessage,
+    UserMessage,
+]);
+
+export const MessageList = z.array(Message);