refactor: unify tool reason requirements

.opencode/tools/clear_scada_analysis.ts

@@ -1,3 +1,4 @@
+import { optionalToolReason } from "../tool-reason.js";
 import { tool } from "../tool.js";
 
 import { executeFrontendAction } from "./frontend_action.js";
@@ -5,11 +6,7 @@ import { executeFrontendAction } from "./frontend_action.js";
 export default tool({
   description: "清除当前浏览器地图上的 Agent SCADA 分析结果覆盖层。",
   args: {
-    reason: tool.schema
-      .string()
-      .trim()
-      .min(1)
-      .describe("Why the current SCADA analysis overlay should be cleared."),
+    reason: optionalToolReason,
   },
   async execute(args, context) {
     return executeFrontendAction("clear_scada_analysis", args, context);