解析工具调用参数，优化事件处理逻辑

src/lib/chatStream.ts

@@ -52,6 +52,30 @@ const parseEventBlock = (block: string): { event?: string; data?: string } => {
   };
 };
 
+const isObjectRecord = (value: unknown): value is Record<string, unknown> =>
+  typeof value === "object" && value !== null && !Array.isArray(value);
+
+const resolveToolParams = (
+  params: unknown,
+  argumentsPayload: unknown,
+): Record<string, unknown> => {
+  if (isObjectRecord(params) && Object.keys(params).length > 0) {
+    return params;
+  }
+  if (isObjectRecord(argumentsPayload)) {
+    return argumentsPayload;
+  }
+  if (typeof argumentsPayload === "string") {
+    try {
+      const parsed = JSON.parse(argumentsPayload) as unknown;
+      return isObjectRecord(parsed) ? parsed : {};
+    } catch {
+      return {};
+    }
+  }
+  return isObjectRecord(params) ? params : {};
+};
+
 export const streamAgentChat = async ({
   message,
   sessionId,
@@ -125,11 +149,13 @@ export const streamAgentChat = async ({
       try {
         const parsed = JSON.parse(data) as {
           session_id?: string;
+          conversationId?: string;
           content?: string;
           message?: string;
           detail?: string;
           tool?: string;
           params?: Record<string, unknown>;
+          arguments?: unknown;
           id?: string;
           phase?: string;
           status?: "running" | "completed" | "error";
@@ -166,9 +192,9 @@ export const streamAgentChat = async ({
         } else if (event === "tool_call") {
           onEvent({
             type: "tool_call",
-            sessionId: parsed.session_id ?? "",
+            sessionId: parsed.session_id ?? parsed.conversationId ?? "",
             tool: parsed.tool ?? "",
-            params: parsed.params ?? {},
+            params: resolveToolParams(parsed.params, parsed.arguments),
           });
         }
       } catch {