feat: add hide/unhide agents from UI (#453)

Add ability to hide agents from the dashboard without deleting them.
Hidden agents still receive heartbeats and exist in the DB — they are
purely hidden from the default UI view.

- Migration 042: adds `hidden` column to agents table
- API: POST/DELETE /api/agents/[id]/hide to toggle visibility
- GET /api/agents filters hidden by default, ?show_hidden=true to include
- UI: "Show hidden" toggle in panel header, Hide/Unhide button on cards

Co-authored-by: Dan <github@bookkept.com.au>

src/app/api/agents/[id]/hide/route.ts

@@ -0,0 +1,70 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { getDatabase } from '@/lib/db'
+import { requireRole } from '@/lib/auth'
+import { logger } from '@/lib/logger'
+
+/**
+ * POST /api/agents/[id]/hide - Hide an agent from the UI
+ */
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const auth = requireRole(request, 'operator')
+  if ('error' in auth) return NextResponse.json({ error: auth.error }, { status: auth.status })
+
+  try {
+    const db = getDatabase()
+    const { id } = await params
+    const workspaceId = auth.user.workspace_id ?? 1
+
+    const idNum = Number(id)
+    const agent = isNaN(idNum)
+      ? db.prepare('SELECT id, name FROM agents WHERE name = ? AND workspace_id = ?').get(id, workspaceId) as any
+      : db.prepare('SELECT id, name FROM agents WHERE id = ? AND workspace_id = ?').get(idNum, workspaceId) as any
+
+    if (!agent) {
+      return NextResponse.json({ error: 'Agent not found' }, { status: 404 })
+    }
+
+    db.prepare('UPDATE agents SET hidden = 1, updated_at = unixepoch() WHERE id = ?').run(agent.id)
+
+    return NextResponse.json({ success: true, agent_id: agent.id, hidden: true })
+  } catch (error) {
+    logger.error({ err: error }, 'POST /api/agents/[id]/hide error')
+    return NextResponse.json({ error: 'Failed to hide agent' }, { status: 500 })
+  }
+}
+
+/**
+ * DELETE /api/agents/[id]/hide - Unhide an agent
+ */
+export async function DELETE(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const auth = requireRole(request, 'operator')
+  if ('error' in auth) return NextResponse.json({ error: auth.error }, { status: auth.status })
+
+  try {
+    const db = getDatabase()
+    const { id } = await params
+    const workspaceId = auth.user.workspace_id ?? 1
+
+    const idNum = Number(id)
+    const agent = isNaN(idNum)
+      ? db.prepare('SELECT id, name FROM agents WHERE name = ? AND workspace_id = ?').get(id, workspaceId) as any
+      : db.prepare('SELECT id, name FROM agents WHERE id = ? AND workspace_id = ?').get(idNum, workspaceId) as any
+
+    if (!agent) {
+      return NextResponse.json({ error: 'Agent not found' }, { status: 404 })
+    }
+
+    db.prepare('UPDATE agents SET hidden = 0, updated_at = unixepoch() WHERE id = ?').run(agent.id)
+
+    return NextResponse.json({ success: true, agent_id: agent.id, hidden: false })
+  } catch (error) {
+    logger.error({ err: error }, 'DELETE /api/agents/[id]/hide error')
+    return NextResponse.json({ error: 'Failed to unhide agent' }, { status: 500 })
+  }
+}

src/app/api/agents/route.ts

@@ -29,12 +29,17 @@ export async function GET(request: NextRequest) {
     // Parse query parameters
     const status = searchParams.get('status');
     const role = searchParams.get('role');
+    const showHidden = searchParams.get('show_hidden') === 'true';
     const limit = Math.min(parseInt(searchParams.get('limit') || '50'), 200);
     const offset = parseInt(searchParams.get('offset') || '0');
-    
+
     // Build dynamic query
     let query = 'SELECT * FROM agents WHERE workspace_id = ?';
     const params: any[] = [workspaceId];
+
+    if (!showHidden) {
+      query += ' AND hidden = 0';
+    }
     
     if (status) {
       query += ' AND status = ?';
@@ -116,6 +121,9 @@ export async function GET(request: NextRequest) {
     // Get total count for pagination
     let countQuery = 'SELECT COUNT(*) as total FROM agents WHERE workspace_id = ?';
     const countParams: any[] = [workspaceId];
+    if (!showHidden) {
+      countQuery += ' AND hidden = 0';
+    }
     if (status) {
       countQuery += ' AND status = ?';
       countParams.push(status);

src/components/panels/agent-squad-panel-phase3.tsx

@@ -104,6 +104,7 @@ export function AgentSquadPanelPhase3() {
   const [autoRefresh, setAutoRefresh] = useState(true)
   const [syncing, setSyncing] = useState(false)
   const [syncToast, setSyncToast] = useState<string | null>(null)
+  const [showHidden, setShowHidden] = useState(false)
 
   // Sync agents from gateway config or local disk
   const syncFromConfig = async (source?: 'local') => {
@@ -142,7 +143,8 @@ export function AgentSquadPanelPhase3() {
       setError(null)
       if (agents.length === 0) setLoading(true)
 
-      const response = await fetch('/api/agents')
+      const url = showHidden ? '/api/agents?show_hidden=true' : '/api/agents'
+      const response = await fetch(url)
       if (response.status === 401) {
         window.location.assign('/login?next=%2Fagents')
         return
@@ -162,7 +164,7 @@ export function AgentSquadPanelPhase3() {
     } finally {
       setLoading(false)
     }
-  }, [agents.length, setAgents])
+  }, [agents.length, setAgents, showHidden])
 
   // Smart polling with visibility pause
   useSmartPoll(fetchAgents, 30000, { enabled: autoRefresh, pauseWhenSseConnected: true })
@@ -223,6 +225,25 @@ export function AgentSquadPanelPhase3() {
     }
   }
 
+  // Re-fetch when showHidden changes
+  useEffect(() => {
+    fetchAgents()
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [showHidden])
+
+  const toggleAgentHidden = async (agentId: number, hide: boolean) => {
+    try {
+      const response = await fetch(`/api/agents/${agentId}/hide`, {
+        method: hide ? 'POST' : 'DELETE',
+      })
+      if (!response.ok) throw new Error('Failed to update visibility')
+      fetchAgents()
+    } catch (error) {
+      log.error('Failed to toggle agent visibility:', error)
+      setError('Failed to update agent visibility')
+    }
+  }
+
   const deleteAgent = async (agentId: number, removeWorkspace: boolean) => {
     const previousAgents = agents
     setAgents(agents.filter((agent) => agent.id !== agentId))
@@ -333,6 +354,13 @@ export function AgentSquadPanelPhase3() {
           >
             {t('syncLocal')}
           </Button>
+          <Button
+            onClick={() => setShowHidden(!showHidden)}
+            variant={showHidden ? 'success' : 'secondary'}
+            size="sm"
+          >
+            {showHidden ? 'Showing hidden' : 'Show hidden'}
+          </Button>
           <Button
             onClick={() => setShowCreateModal(true)}
             size="sm"
@@ -399,6 +427,7 @@ export function AgentSquadPanelPhase3() {
                   onClick={() => setSelectedAgent(agent)}
                 >
                   <div className={`pointer-events-none absolute inset-y-0 left-0 w-1 bg-gradient-to-b ${(statusCardStyles[agent.status] || defaultCardStyle).edge}`} />
+                  {agent.hidden ? <div className="absolute top-2 right-2 text-2xs text-slate-500">hidden</div> : null}
 
                   {/* Header: avatar + name + status */}
                   <div className="flex items-start justify-between mb-2">
@@ -494,6 +523,17 @@ export function AgentSquadPanelPhase3() {
                       >
                         {t('spawn')}
                       </Button>
+                      <Button
+                        onClick={(e) => {
+                          e.stopPropagation()
+                          toggleAgentHidden(agent.id, !agent.hidden)
+                        }}
+                        size="xs"
+                        variant="ghost"
+                        className="h-6 px-2 text-xs text-slate-400 hover:bg-slate-500/15 hover:text-slate-300"
+                      >
+                        {agent.hidden ? 'Unhide' : 'Hide'}
+                      </Button>
                     </div>
                   </div>
                 </div>

src/lib/migrations.ts

@@ -1262,6 +1262,12 @@ const migrations: Migration[] = [
       db.exec(`CREATE INDEX IF NOT EXISTS idx_gateway_health_logs_gateway_id ON gateway_health_logs(gateway_id)`)
       db.exec(`CREATE INDEX IF NOT EXISTS idx_gateway_health_logs_probed_at ON gateway_health_logs(probed_at)`)
     }
+  },
+  {
+    id: '042_agent_hidden',
+    up(db: Database.Database) {
+      db.exec(`ALTER TABLE agents ADD COLUMN hidden INTEGER NOT NULL DEFAULT 0`)
+    }
   }
 ]
 

src/store/index.ts

@@ -143,6 +143,7 @@ export interface Agent {
   last_activity?: string
   created_at: number
   updated_at: number
+  hidden?: number
   config?: JsonValue
   taskStats?: {
     total: number