feat: add realtime subagent status report

frontend/src/core/tools/utils.ts

@@ -0,0 +1,29 @@
+import type { ToolCall } from "@langchain/core/messages";
+import type { AIMessage } from "@langchain/langgraph-sdk";
+
+import type { Translations } from "../i18n";
+import { hasToolCalls } from "../messages/utils";
+
+export function explainLastToolCall(message: AIMessage, t: Translations) {
+  if (hasToolCalls(message)) {
+    const lastToolCall = message.tool_calls![message.tool_calls!.length - 1]!;
+    return explainToolCall(lastToolCall, t);
+  }
+  return t.common.thinking;
+}
+
+export function explainToolCall(toolCall: ToolCall, t: Translations) {
+  if (toolCall.name === "web_search" || toolCall.name === "image_search") {
+    return t.toolCalls.searchFor(toolCall.args.query);
+  } else if (toolCall.name === "web_fetch") {
+    return t.toolCalls.viewWebPage;
+  } else if (toolCall.name === "present_files") {
+    return t.toolCalls.presentFiles;
+  } else if (toolCall.name === "write_todos") {
+    return t.toolCalls.writeTodos;
+  } else if (toolCall.args.description) {
+    return toolCall.args.description;
+  } else {
+    return t.toolCalls.useTool(toolCall.name);
+  }
+}