diff --git a/internal/multiagent/eino_middleware.go b/internal/multiagent/eino_middleware.go
index 1a1d2106..640fba38 100644
--- a/internal/multiagent/eino_middleware.go
+++ b/internal/multiagent/eino_middleware.go
@@ -51,14 +51,7 @@ func splitToolsForToolSearch(all []tool.BaseTool, alwaysVisible int) (static []t
 }
 
 func splitToolsForToolSearchByNames(all []tool.BaseTool, names []string, fallbackAlwaysVisible int) (static []tool.BaseTool, dynamic []tool.BaseTool, ok bool) {
-	nameSet := make(map[string]struct{}, len(names))
-	for _, n := range names {
-		n = strings.TrimSpace(strings.ToLower(n))
-		if n == "" {
-			continue
-		}
-		nameSet[n] = struct{}{}
-	}
+	nameSet := expandAlwaysVisibleNameSet(names)
 	if len(nameSet) == 0 {
 		return splitToolsForToolSearch(all, fallbackAlwaysVisible)
 	}
@@ -71,9 +64,9 @@ func splitToolsForToolSearchByNames(all []tool.BaseTool, names []string, fallbac
 		info, err := t.Info(context.Background())
 		name := ""
 		if err == nil && info != nil {
-			name = strings.TrimSpace(strings.ToLower(info.Name))
+			name = info.Name
 		}
-		if _, keep := nameSet[name]; keep {
+		if toolMatchesAlwaysVisible(name, nameSet) {
 			static = append(static, t)
 			continue
 		}
diff --git a/internal/multiagent/tool_always_visible.go b/internal/multiagent/tool_always_visible.go
new file mode 100644
index 00000000..151cccc2
--- /dev/null
+++ b/internal/multiagent/tool_always_visible.go
@@ -0,0 +1,72 @@
+package multiagent
+
+import (
+	"strings"
+)
+
+// expandAlwaysVisibleNameSet 将配置中的常驻工具名展开为可匹配运行时工具名的集合。
+// 支持：内置短名 read_file；外部 mcp::tool；运行时 mcp__tool（OpenAI/Eino 命名）。
+func expandAlwaysVisibleNameSet(names []string) map[string]struct{} {
+	set := make(map[string]struct{}, len(names)*3)
+	add := func(name string) {
+		n := strings.TrimSpace(strings.ToLower(name))
+		if n == "" {
+			return
+		}
+		set[n] = struct{}{}
+	}
+	for _, raw := range names {
+		n := strings.TrimSpace(strings.ToLower(raw))
+		if n == "" {
+			continue
+		}
+		add(n)
+		if mcp, tool, ok := strings.Cut(n, "::"); ok && mcp != "" && tool != "" {
+			// 外部工具用 mcp::tool 配置时只展开运行时 mcp__tool，避免短名误伤其它 MCP 同名工具。
+			add(mcp + "__" + tool)
+			continue
+		}
+		if idx := strings.LastIndex(n, "__"); idx > 0 {
+			mcp, tool := n[:idx], n[idx+2:]
+			if mcp != "" && tool != "" {
+				add(mcp + "::" + tool)
+			}
+			continue
+		}
+	}
+	return set
+}
+
+// toolMatchesAlwaysVisible 判断运行时工具名是否命中常驻白名单（含别名）。
+func toolMatchesAlwaysVisible(runtimeName string, nameSet map[string]struct{}) bool {
+	if len(nameSet) == 0 {
+		return false
+	}
+	name := strings.TrimSpace(strings.ToLower(runtimeName))
+	if name == "" {
+		return false
+	}
+	if _, ok := nameSet[name]; ok {
+		return true
+	}
+	if mcp, tool, ok := strings.Cut(name, "::"); ok && mcp != "" && tool != "" {
+		if _, ok := nameSet[mcp+"__"+tool]; ok {
+			return true
+		}
+		if _, ok := nameSet[tool]; ok {
+			return true
+		}
+	}
+	if idx := strings.LastIndex(name, "__"); idx > 0 {
+		mcp, tool := name[:idx], name[idx+2:]
+		if mcp != "" && tool != "" {
+			if _, ok := nameSet[mcp+"::"+tool]; ok {
+				return true
+			}
+			if _, ok := nameSet[tool]; ok {
+				return true
+			}
+		}
+	}
+	return false
+}
diff --git a/internal/multiagent/tool_always_visible_test.go b/internal/multiagent/tool_always_visible_test.go
new file mode 100644
index 00000000..00c9eaa0
--- /dev/null
+++ b/internal/multiagent/tool_always_visible_test.go
@@ -0,0 +1,32 @@
+package multiagent
+
+import "testing"
+
+func TestToolMatchesAlwaysVisible_ExternalAliases(t *testing.T) {
+	t.Parallel()
+	set := expandAlwaysVisibleNameSet([]string{"zhidemai::discount_search", "read_file"})
+
+	cases := []struct {
+		runtime string
+		want    bool
+	}{
+		{"zhidemai__discount_search", true},
+		{"zhidemai::discount_search", true},
+		{"read_file", true},
+		{"zhidemai__product_search_pro", false},
+		{"github__discount_search", false},
+	}
+	for _, tc := range cases {
+		if got := toolMatchesAlwaysVisible(tc.runtime, set); got != tc.want {
+			t.Fatalf("toolMatchesAlwaysVisible(%q) = %v, want %v", tc.runtime, got, tc.want)
+		}
+	}
+}
+
+func TestExpandAlwaysVisibleNameSet_LegacyShortName(t *testing.T) {
+	t.Parallel()
+	set := expandAlwaysVisibleNameSet([]string{"discount_search"})
+	if !toolMatchesAlwaysVisible("zhidemai__discount_search", set) {
+		t.Fatal("legacy short name should match external runtime tool")
+	}
+}