feat: add MCP tool integration

frontend/src/components/workflow/panels/EdgeSettingsPanel.tsx

@@ -3,6 +3,8 @@
 import type { Edge } from "@xyflow/react";
 import {
   Braces,
+  CircleCheck,
+  CircleX,
   GitBranch,
   MessageSquareText,
   Plus,
@@ -92,6 +94,24 @@ export function EdgeSettingsPanel({
     publish({ nextRules });
   };
 
+  const applyActionResultPreset = (status: "ok" | "error") => {
+    const nextRules: ExpressionRule[] = [
+      {
+        variable: "system__last_action_status",
+        operator: "eq",
+        value: status,
+      },
+    ];
+    setMode("expression");
+    setCombinator("and");
+    setRules(nextRules);
+    publish({
+      nextMode: "expression",
+      nextCombinator: "and",
+      nextRules,
+    });
+  };
+
   const parseValue = (value: string): unknown => {
     if (value === "true") return true;
     if (value === "false") return false;
@@ -139,6 +159,35 @@ export function EdgeSettingsPanel({
             Agent 不能只有默认路径；请改为条件路径，或删除连接以持续对话。
           </span>
         )}
+        {sourceType === "action" && (
+          <div className="rounded-xl border border-hairline bg-canvas-soft p-3">
+            <div className="mb-2 text-xs text-muted-foreground">
+              Action 常用结果条件
+            </div>
+            <div className="flex flex-wrap gap-2">
+              <Button
+                type="button"
+                size="sm"
+                variant="outline"
+                className="gap-1.5"
+                onClick={() => applyActionResultPreset("ok")}
+              >
+                <CircleCheck size={14} />
+                执行成功
+              </Button>
+              <Button
+                type="button"
+                size="sm"
+                variant="outline"
+                className="gap-1.5"
+                onClick={() => applyActionResultPreset("error")}
+              >
+                <CircleX size={14} />
+                执行失败
+              </Button>
+            </div>
+          </div>
+        )}
         {mode !== "always" && (
           <label className="block">
             <div className="mb-1.5 text-sm font-medium text-foreground">