feat: implement subagents configuration management

- Added a new function to retrieve subagents configuration from settings, allowing users to enable/disable subagents and select sources for loading them.
- Updated the AgentService to incorporate subagents configuration, dynamically adding tools based on the settings.
- Enhanced the UI components to manage subagents, including a settings section for enabling/disabling and selecting sources.
- Introduced a new hook for managing subagents settings state and interactions.

These changes improve the flexibility and usability of subagents within the application, enhancing user experience and configuration options.

apps/ui/src/components/views/settings-view/providers/claude-settings-tab/hooks/use-subagents-settings.ts

@@ -0,0 +1,63 @@
+/**
+ * Subagents Settings Hook - Manages Subagents configuration state
+ *
+ * Provides state management for enabling/disabling Subagents and
+ * configuring which sources to load Subagents from (user/project).
+ */
+
+import { useState } from 'react';
+import { useAppStore } from '@/store/app-store';
+import { toast } from 'sonner';
+import { getElectronAPI } from '@/lib/electron';
+
+export function useSubagentsSettings() {
+  const enabled = useAppStore((state) => state.enableSubagents);
+  const sources = useAppStore((state) => state.subagentsSources);
+  const [isLoading, setIsLoading] = useState(false);
+
+  const updateEnabled = async (newEnabled: boolean) => {
+    setIsLoading(true);
+    try {
+      const api = getElectronAPI();
+      if (!api.settings) {
+        throw new Error('Settings API not available');
+      }
+      await api.settings.updateGlobal({ enableSubagents: newEnabled });
+      // Update local store after successful server update
+      useAppStore.setState({ enableSubagents: newEnabled });
+      toast.success(newEnabled ? 'Subagents enabled' : 'Subagents disabled');
+    } catch (error) {
+      toast.error('Failed to update subagents settings');
+      console.error(error);
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  const updateSources = async (newSources: Array<'user' | 'project'>) => {
+    setIsLoading(true);
+    try {
+      const api = getElectronAPI();
+      if (!api.settings) {
+        throw new Error('Settings API not available');
+      }
+      await api.settings.updateGlobal({ subagentsSources: newSources });
+      // Update local store after successful server update
+      useAppStore.setState({ subagentsSources: newSources });
+      toast.success('Subagents sources updated');
+    } catch (error) {
+      toast.error('Failed to update subagents sources');
+      console.error(error);
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  return {
+    enabled,
+    sources,
+    updateEnabled,
+    updateSources,
+    isLoading,
+  };
+}

apps/ui/src/components/views/settings-view/providers/claude-settings-tab/subagents-section.tsx

@@ -1,26 +1,62 @@
 /**
- * Subagents Section - UI for viewing filesystem-based agents
+ * Subagents Section - UI for managing Subagents configuration
+ *
+ * Allows users to enable/disable Subagents and select which directories
+ * to load Subagents from (user ~/.claude/agents/ or project .claude/agents/).
  *
  * Displays agents discovered from:
  * - User-level: ~/.claude/agents/
  * - Project-level: .claude/agents/
- *
- * Read-only view - agents are managed by editing .md files directly.
  */
 
 import { Button } from '@/components/ui/button';
+import { Label } from '@/components/ui/label';
+import { Switch } from '@/components/ui/switch';
+import { Checkbox } from '@/components/ui/checkbox';
 import { cn } from '@/lib/utils';
-import { Bot, RefreshCw, Loader2, Users, ExternalLink } from 'lucide-react';
+import {
+  Bot,
+  RefreshCw,
+  Loader2,
+  Users,
+  ExternalLink,
+  Globe,
+  FolderOpen,
+  Sparkles,
+} from 'lucide-react';
 import { useSubagents } from './hooks/use-subagents';
+import { useSubagentsSettings } from './hooks/use-subagents-settings';
 import { SubagentCard } from './subagent-card';
 
 export function SubagentsSection() {
-  const { subagentsWithScope, isLoading, hasProject, refreshFilesystemAgents } = useSubagents();
+  const {
+    subagentsWithScope,
+    isLoading: isLoadingAgents,
+    hasProject,
+    refreshFilesystemAgents,
+  } = useSubagents();
+  const {
+    enabled,
+    sources,
+    updateEnabled,
+    updateSources,
+    isLoading: isLoadingSettings,
+  } = useSubagentsSettings();
+
+  const isLoading = isLoadingAgents || isLoadingSettings;
 
   const handleRefresh = async () => {
     await refreshFilesystemAgents();
   };
 
+  const toggleSource = (source: 'user' | 'project') => {
+    if (sources.includes(source)) {
+      updateSources(sources.filter((s: 'user' | 'project') => s !== source));
+    } else {
+      updateSources([...sources, source]);
+    }
+  };
+
   return (
     <div
       className={cn(
@@ -39,7 +75,7 @@ export function SubagentsSection() {
           <div>
             <h3 className="font-semibold text-base flex items-center gap-2">
               Custom Subagents
-              {subagentsWithScope.length > 0 && (
+              {enabled && subagentsWithScope.length > 0 && (
                 <span className="text-xs font-normal px-2 py-0.5 rounded-full bg-violet-500/20 text-violet-500">
                   {subagentsWithScope.length} agent{subagentsWithScope.length !== 1 ? 's' : ''}
                 </span>
@@ -50,57 +86,169 @@ export function SubagentsSection() {
             </p>
           </div>
         </div>
-        <Button
-          variant="outline"
-          size="sm"
-          onClick={handleRefresh}
+        <Switch
+          id="enable-subagents"
+          checked={enabled}
+          onCheckedChange={updateEnabled}
           disabled={isLoading}
-          title="Refresh agents from disk"
-          className="gap-2"
-        >
-          {isLoading ? (
-            <Loader2 className="h-4 w-4 animate-spin" />
-          ) : (
-            <RefreshCw className="h-4 w-4" />
-          )}
-          <span className="text-xs">Refresh</span>
-        </Button>
+        />
       </div>
 
       {/* Content */}
-      <div className="p-6">
-        {subagentsWithScope.length === 0 ? (
-          <div className="text-center py-8 text-muted-foreground">
-            <Users className="w-12 h-12 mx-auto mb-3 opacity-30" />
-            <p className="text-sm font-medium">No agents found</p>
-            <p className="text-xs mt-2 max-w-sm mx-auto">
-              Create <code className="text-xs bg-muted px-1 rounded">.md</code> files in{' '}
-              <code className="text-xs bg-muted px-1 rounded">~/.claude/agents/</code>
-              {hasProject && (
-                <>
-                  {' or '}
-                  <code className="text-xs bg-muted px-1 rounded">.claude/agents/</code>
-                </>
-              )}
-            </p>
+      <div className="p-6 space-y-4">
+        {/* Sources Selection */}
+        {enabled && (
+          <div className="space-y-3">
+            <Label className="text-xs uppercase tracking-wide text-muted-foreground">
+              Load Subagents from
+            </Label>
+            <div className="grid gap-2">
+              {/* User Subagents Option */}
+              <label
+                htmlFor="subagent-source-user"
+                className={cn(
+                  'flex items-center gap-3 p-3 rounded-xl border cursor-pointer transition-all duration-200',
+                  sources.includes('user')
+                    ? 'border-violet-500/50 bg-violet-500/10'
+                    : 'border-border/50 bg-accent/20 hover:bg-accent/30'
+                )}
+              >
+                <Checkbox
+                  id="subagent-source-user"
+                  checked={sources.includes('user')}
+                  onCheckedChange={() => toggleSource('user')}
+                  disabled={isLoading}
+                  className="data-[state=checked]:bg-violet-500 data-[state=checked]:border-violet-500"
+                />
+                <div className="w-8 h-8 rounded-lg bg-muted/50 flex items-center justify-center shrink-0">
+                  <Globe className="w-4 h-4 text-muted-foreground" />
+                </div>
+                <div className="flex-1 min-w-0">
+                  <span className="text-sm font-medium">User Subagents</span>
+                  <span className="block text-xs text-muted-foreground mt-0.5 truncate">
+                    ~/.claude/agents/ — Available across all projects
+                  </span>
+                </div>
+              </label>
+
+              {/* Project Subagents Option */}
+              <label
+                htmlFor="subagent-source-project"
+                className={cn(
+                  'flex items-center gap-3 p-3 rounded-xl border cursor-pointer transition-all duration-200',
+                  sources.includes('project')
+                    ? 'border-violet-500/50 bg-violet-500/10'
+                    : 'border-border/50 bg-accent/20 hover:bg-accent/30'
+                )}
+              >
+                <Checkbox
+                  id="subagent-source-project"
+                  checked={sources.includes('project')}
+                  onCheckedChange={() => toggleSource('project')}
+                  disabled={isLoading}
+                  className="data-[state=checked]:bg-violet-500 data-[state=checked]:border-violet-500"
+                />
+                <div className="w-8 h-8 rounded-lg bg-muted/50 flex items-center justify-center shrink-0">
+                  <FolderOpen className="w-4 h-4 text-muted-foreground" />
+                </div>
+                <div className="flex-1 min-w-0">
+                  <span className="text-sm font-medium">Project Subagents</span>
+                  <span className="block text-xs text-muted-foreground mt-0.5 truncate">
+                    .claude/agents/ — Version-controlled with project
+                  </span>
+                </div>
+              </label>
+            </div>
+          </div>
+        )}
+
+        {/* Agents List */}
+        {enabled && (
+          <>
+            {/* Refresh Button */}
+            <div className="flex items-center justify-between">
+              <Label className="text-xs uppercase tracking-wide text-muted-foreground">
+                Discovered Agents
+              </Label>
+              <Button
+                variant="ghost"
+                size="sm"
+                onClick={handleRefresh}
+                disabled={isLoading}
+                title="Refresh agents from disk"
+                className="gap-1.5 h-7 px-2 text-xs"
+              >
+                {isLoadingAgents ? (
+                  <Loader2 className="h-3.5 w-3.5 animate-spin" />
+                ) : (
+                  <RefreshCw className="h-3.5 w-3.5" />
+                )}
+                Refresh
+              </Button>
+            </div>
+
+            {subagentsWithScope.length === 0 ? (
+              <div className="text-center py-6 text-muted-foreground border border-dashed border-border/50 rounded-xl">
+                <Users className="w-10 h-10 mx-auto mb-2 opacity-30" />
+                <p className="text-sm font-medium">No agents found</p>
+                <p className="text-xs mt-1 max-w-sm mx-auto">
+                  Create <code className="text-xs bg-muted px-1 rounded">.md</code> files in{' '}
+                  {sources.includes('user') && (
+                    <code className="text-xs bg-muted px-1 rounded">~/.claude/agents/</code>
+                  )}
+                  {sources.includes('user') && sources.includes('project') && ' or '}
+                  {sources.includes('project') && (
+                    <code className="text-xs bg-muted px-1 rounded">.claude/agents/</code>
+                  )}
+                </p>
+              </div>
+            ) : (
+              <div className="space-y-2">
+                {subagentsWithScope.map((agent) => (
+                  <SubagentCard
+                    key={`${agent.type}-${agent.source || agent.scope}-${agent.name}`}
+                    agent={agent}
+                  />
+                ))}
+              </div>
+            )}
+          </>
+        )}
+
+        {/* Help Text */}
+        {enabled && (
+          <div className="rounded-xl border border-border/30 bg-muted/30 p-4 space-y-3">
+            <div className="flex items-start gap-3">
+              <div className="w-6 h-6 rounded-md bg-brand-500/20 flex items-center justify-center shrink-0 mt-0.5">
+                <Sparkles className="w-3.5 h-3.5 text-brand-500" />
+              </div>
+              <div className="text-xs text-muted-foreground space-y-1">
+                <p className="font-medium text-foreground/80">Auto-Discovery</p>
+                <p>
+                  Subagents are automatically discovered when agents start. Define agents as{' '}
+                  <code className="text-xs bg-muted px-1 rounded">AGENT.md</code> files or{' '}
+                  <code className="text-xs bg-muted px-1 rounded">agent-name.md</code> files.
+                </p>
+              </div>
+            </div>
             <a
               href="https://code.claude.com/docs/en/agents"
               target="_blank"
               rel="noopener noreferrer"
-              className="inline-flex items-center gap-1.5 mt-4 text-xs text-brand-500 hover:text-brand-400 transition-colors"
+              className="flex items-center gap-2 text-xs text-brand-500 hover:text-brand-400 transition-colors"
             >
               <ExternalLink className="w-3.5 h-3.5" />
               View Agents documentation
             </a>
           </div>
-        ) : (
-          <div className="space-y-3">
-            {subagentsWithScope.map((agent) => (
-              <SubagentCard
-                key={`${agent.type}-${agent.source || agent.scope}-${agent.name}`}
-                agent={agent}
-              />
-            ))}
+        )}
+
+        {/* Disabled State Empty Message */}
+        {!enabled && (
+          <div className="text-center py-6 text-muted-foreground">
+            <Bot className="w-10 h-10 mx-auto mb-3 opacity-30" />
+            <p className="text-sm">Subagents are disabled</p>
+            <p className="text-xs mt-1">Enable to load custom agent definitions</p>
           </div>
         )}
       </div>