fix: add ping/pong keepalive to main and bridge WebSockets

.trajectories/completed/2026-01/traj_ub8csuv3lcv4.json

@@ -0,0 +1,53 @@
+{
+  "id": "traj_ub8csuv3lcv4",
+  "version": 1,
+  "task": {
+    "title": "Fix WebSocket disconnections for workspace instances",
+    "source": {
+      "system": "plain",
+      "id": "workspace-websocket-stability"
+    }
+  },
+  "status": "completed",
+  "startedAt": "2026-01-06T18:13:23.603Z",
+  "agents": [
+    {
+      "name": "default",
+      "role": "lead",
+      "joinedAt": "2026-01-06T18:13:35.723Z"
+    }
+  ],
+  "chapters": [
+    {
+      "id": "chap_e4vj0j8ig7ma",
+      "title": "Work",
+      "agentName": "default",
+      "startedAt": "2026-01-06T18:13:35.723Z",
+      "events": [
+        {
+          "ts": 1767723215725,
+          "type": "decision",
+          "content": "Add ping/pong keepalive to main and bridge WebSockets: Add ping/pong keepalive to main and bridge WebSockets",
+          "raw": {
+            "question": "Add ping/pong keepalive to main and bridge WebSockets",
+            "chosen": "Add ping/pong keepalive to main and bridge WebSockets",
+            "alternatives": [],
+            "reasoning": "Main dashboard and bridge WebSocket endpoints were missing ping/pong keepalive, while logs and presence endpoints had it. Without keepalive, TCP/proxy timeouts kill idle connections (typically 60-120s)."
+          },
+          "significance": "high"
+        }
+      ],
+      "endedAt": "2026-01-06T18:16:51.462Z"
+    }
+  ],
+  "commits": [],
+  "filesChanged": [],
+  "projectId": "/home/user/relay",
+  "tags": [],
+  "completedAt": "2026-01-06T18:16:51.462Z",
+  "retrospective": {
+    "summary": "Added ping/pong keepalive to main and bridge WebSockets to fix connection instability",
+    "approach": "Standard approach",
+    "confidence": 0.9
+  }
+}

.trajectories/completed/2026-01/traj_ub8csuv3lcv4.md

@@ -0,0 +1,32 @@
+# Trajectory: Fix WebSocket disconnections for workspace instances
+
+> **Status:** ✅ Completed
+> **Task:** workspace-websocket-stability
+> **Confidence:** 90%
+> **Started:** January 6, 2026 at 06:13 PM
+> **Completed:** January 6, 2026 at 06:16 PM
+
+---
+
+## Summary
+
+Added ping/pong keepalive to main and bridge WebSockets to fix connection instability
+
+**Approach:** Standard approach
+
+---
+
+## Key Decisions
+
+### Add ping/pong keepalive to main and bridge WebSockets
+- **Chose:** Add ping/pong keepalive to main and bridge WebSockets
+- **Reasoning:** Main dashboard and bridge WebSocket endpoints were missing ping/pong keepalive, while logs and presence endpoints had it. Without keepalive, TCP/proxy timeouts kill idle connections (typically 60-120s).
+
+---
+
+## Chapters
+
+### 1. Work
+*Agent: default*
+
+- Add ping/pong keepalive to main and bridge WebSockets: Add ping/pong keepalive to main and bridge WebSockets

.trajectories/index.json

@@ -1,6 +1,6 @@
 {
   "version": 1,
-  "lastUpdated": "2026-01-06T17:12:56.941Z",
+  "lastUpdated": "2026-01-06T18:16:51.488Z",
   "trajectories": {
     "traj_ozd98si6a7ns": {
       "title": "Fix thinking indicator showing on all messages",
@@ -365,6 +365,13 @@
       "startedAt": "2026-01-06T17:11:57.504Z",
       "completedAt": "2026-01-06T17:12:56.919Z",
       "path": "/home/user/relay/.trajectories/completed/2026-01/traj_v9dkdoxylyid.json"
+    },
+    "traj_ub8csuv3lcv4": {
+      "title": "Fix WebSocket disconnections for workspace instances",
+      "status": "completed",
+      "startedAt": "2026-01-06T18:13:23.603Z",
+      "completedAt": "2026-01-06T18:16:51.462Z",
+      "path": "/home/user/relay/.trajectories/completed/2026-01/traj_ub8csuv3lcv4.json"
     }
   }
-}
+}

src/daemon/api.ts

@@ -55,6 +55,10 @@ export class DaemonApi extends EventEmitter {
   private allowedOrigins: Set<string>;
   private allowAllOrigins: boolean;
 
+  // Track alive status for ping/pong keepalive
+  private clientAlive = new WeakMap<WS, boolean>();
+  private pingInterval?: NodeJS.Timeout;
+
   constructor(config: ApiDaemonConfig) {
     super();
     this.config = config;
@@ -127,6 +131,19 @@ export class DaemonApi extends EventEmitter {
       this.wss = new WebSocketServer({ server: this.server });
       this.wss.on('connection', (ws, req) => this.handleWebSocketConnection(ws, req));
 
+      // Setup ping/pong keepalive (30 second interval)
+      this.pingInterval = setInterval(() => {
+        this.wss?.clients.forEach((ws) => {
+          if (this.clientAlive.get(ws) === false) {
+            logger.info('WebSocket client unresponsive, closing');
+            ws.terminate();
+            return;
+          }
+          this.clientAlive.set(ws, false);
+          ws.ping();
+        });
+      }, 30000);
+
       this.server.listen(this.config.port, this.config.host, () => {
         logger.info('Daemon API started', { port: this.config.port, host: this.config.host });
         resolve();
@@ -138,6 +155,12 @@ export class DaemonApi extends EventEmitter {
    * Stop the API server
    */
   async stop(): Promise<void> {
+    // Clear ping interval
+    if (this.pingInterval) {
+      clearInterval(this.pingInterval);
+      this.pingInterval = undefined;
+    }
+
     // Close all WebSocket connections
     if (this.wss) {
       for (const ws of this.wss.clients) {
@@ -576,6 +599,14 @@ export class DaemonApi extends EventEmitter {
   private handleWebSocketConnection(ws: WS, req: http.IncomingMessage): void {
     logger.info('WebSocket client connected', { url: req.url });
 
+    // Mark client as alive for ping/pong keepalive
+    this.clientAlive.set(ws, true);
+
+    // Handle pong responses
+    ws.on('pong', () => {
+      this.clientAlive.set(ws, true);
+    });
+
     // Create session
     const session: UserSession = {
       userId: 'anonymous', // Would be set from auth

src/daemon/orchestrator.ts

@@ -70,6 +70,10 @@ export class Orchestrator extends EventEmitter {
   });
   private workspacesFile: string;
 
+  // Track alive status for ping/pong keepalive
+  private clientAlive = new WeakMap<WebSocket, boolean>();
+  private pingInterval?: NodeJS.Timeout;
+
   constructor(config: Partial<OrchestratorConfig> = {}) {
     super();
     this.config = { ...DEFAULT_CONFIG, ...config };
@@ -112,6 +116,19 @@ export class Orchestrator extends EventEmitter {
     this.wss = new WebSocketServer({ server: this.server });
     this.wss.on('connection', (ws, req) => this.handleWebSocket(ws, req));
 
+    // Setup ping/pong keepalive (30 second interval)
+    this.pingInterval = setInterval(() => {
+      this.wss?.clients.forEach((ws) => {
+        if (this.clientAlive.get(ws) === false) {
+          logger.info('WebSocket client unresponsive, closing');
+          ws.terminate();
+          return;
+        }
+        this.clientAlive.set(ws, false);
+        ws.ping();
+      });
+    }, 30000);
+
     return new Promise((resolve) => {
       this.server!.listen(this.config.port, this.config.host, () => {
         logger.info('Orchestrator started', {
@@ -128,6 +145,12 @@ export class Orchestrator extends EventEmitter {
   async stop(): Promise<void> {
     logger.info('Stopping orchestrator');
 
+    // Clear ping interval
+    if (this.pingInterval) {
+      clearInterval(this.pingInterval);
+      this.pingInterval = undefined;
+    }
+
     // Stop all workspace daemons
     for (const [id] of this.workspaces) {
       await this.stopWorkspaceDaemon(id);
@@ -606,6 +629,14 @@ export class Orchestrator extends EventEmitter {
   private handleWebSocket(ws: WebSocket, _req: http.IncomingMessage): void {
     logger.info('WebSocket client connected');
 
+    // Mark client as alive for ping/pong keepalive
+    this.clientAlive.set(ws, true);
+
+    // Handle pong responses
+    ws.on('pong', () => {
+      this.clientAlive.set(ws, true);
+    });
+
     const session: UserSession = {
       userId: 'anonymous',
       githubUsername: 'anonymous',

src/dashboard-server/server.ts

@@ -501,6 +501,52 @@ export async function startDashboard(
   // Track log subscriptions: agentName -> Set of WebSocket clients
   const logSubscriptions = new Map<string, Set<WebSocket>>();
 
+  // Track alive status for ping/pong keepalive on main dashboard connections
+  // This prevents TCP/proxy timeouts from killing idle workspace connections
+  const mainClientAlive = new WeakMap<WebSocket, boolean>();
+
+  // Track alive status for ping/pong keepalive on bridge connections
+  const bridgeClientAlive = new WeakMap<WebSocket, boolean>();
+
+  // Ping interval for main dashboard WebSocket connections (30 seconds)
+  // Aligns with heartbeat timeout (5s heartbeat * 6 multiplier = 30s)
+  const MAIN_PING_INTERVAL_MS = 30000;
+  const mainPingInterval = setInterval(() => {
+    wss.clients.forEach((ws) => {
+      if (mainClientAlive.get(ws) === false) {
+        // Client didn't respond to last ping - close gracefully
+        console.log('[dashboard] Main WebSocket client unresponsive, closing gracefully');
+        ws.close(1000, 'unresponsive');
+        return;
+      }
+      // Mark as not alive until we get a pong
+      mainClientAlive.set(ws, false);
+      ws.ping();
+    });
+  }, MAIN_PING_INTERVAL_MS);
+
+  // Ping interval for bridge WebSocket connections (30 seconds)
+  const BRIDGE_PING_INTERVAL_MS = 30000;
+  const bridgePingInterval = setInterval(() => {
+    wssBridge.clients.forEach((ws) => {
+      if (bridgeClientAlive.get(ws) === false) {
+        console.log('[dashboard] Bridge WebSocket client unresponsive, closing gracefully');
+        ws.close(1000, 'unresponsive');
+        return;
+      }
+      bridgeClientAlive.set(ws, false);
+      ws.ping();
+    });
+  }, BRIDGE_PING_INTERVAL_MS);
+
+  // Clean up ping intervals on server close
+  wss.on('close', () => {
+    clearInterval(mainPingInterval);
+  });
+  wssBridge.on('close', () => {
+    clearInterval(bridgePingInterval);
+  });
+
   // Track online users for presence with multi-tab support
   // username -> { connections: Set<WebSocket>, userInfo }
   interface UserPresenceInfo {
@@ -1578,6 +1624,14 @@ export async function startDashboard(
   wss.on('connection', async (ws, req) => {
     console.log('[dashboard] WebSocket client connected from:', req.socket.remoteAddress);
 
+    // Mark client as alive initially for ping/pong keepalive
+    mainClientAlive.set(ws, true);
+
+    // Handle pong responses (keep connection alive)
+    ws.on('pong', () => {
+      mainClientAlive.set(ws, true);
+    });
+
     // Mark as initializing to prevent broadcastData from sending before we do
     initializingClients.add(ws);
 
@@ -1618,6 +1672,14 @@ export async function startDashboard(
   wssBridge.on('connection', async (ws) => {
     console.log('[dashboard] Bridge WebSocket client connected');
 
+    // Mark client as alive initially for ping/pong keepalive
+    bridgeClientAlive.set(ws, true);
+
+    // Handle pong responses (keep connection alive)
+    ws.on('pong', () => {
+      bridgeClientAlive.set(ws, true);
+    });
+
     try {
       const data = await getBridgeData();
       const payload = JSON.stringify(data);