feat(agent): add typed server API tools

.opencode/tools/view_history.ts

@@ -2,7 +2,7 @@ import { tool } from "@opencode-ai/plugin";
 import { executeFrontendAction } from "./frontend_action.js";
 
 export default tool({
-  description: "为选定的管网要素打开前端的历史记录或计算结果面板。",
+  description: "为选定的管网要素打开前端的历史记录或计算结果面板；必须提供 ISO8601 时间区间 start_time 和 end_time。",
   args: {
     reason: tool.schema
       .string()
@@ -17,12 +17,12 @@ export default tool({
       .describe("History data source type."),
     start_time: tool.schema
       .string()
-      .optional()
-      .describe("Optional ISO8601 start time."),
+      .datetime()
+      .describe("Required ISO8601 inclusive start time for the history query."),
     end_time: tool.schema
       .string()
-      .optional()
-      .describe("Optional ISO8601 end time."),
+      .datetime()
+      .describe("Required ISO8601 exclusive end time for the history query; must be after start_time."),
   },
   async execute(args, context) {
     return executeFrontendAction("view_history", args, context);