diff --git a/src/web/public/app.js b/src/web/public/app.js
index 35b10fb5..8c9a297f 100644
--- a/src/web/public/app.js
+++ b/src/web/public/app.js
@@ -2105,8 +2105,9 @@ class CodemanApp {
 
     // Track working directory for path normalization in Project Insights
     this.currentSessionWorkingDir = session?.workingDir || null;
-    if (session && session.pid === null && session.status === 'idle') {
-      // This is a restored session - attach to the existing screen/shell
+    if (session && session.pid === null && !session._ended) {
+      // Session has no PTY attached — either restored after server restart
+      // or detached for some other reason. Re-attach regardless of status.
       try {
         const endpoint = session.mode === 'shell'
           ? `/api/sessions/${sessionId}/shell`
diff --git a/src/web/server.ts b/src/web/server.ts
index 5395d04b..e93df334 100644
--- a/src/web/server.ts
+++ b/src/web/server.ts
@@ -1766,15 +1766,28 @@ export class WebServer extends EventEmitter {
 
             this.sessions.set(session.id, session);
             await this.setupSessionListeners(session);
-            this.persistSessionState(session);
 
-            // Mark it as restored (not started yet - user needs to attach)
-            getLifecycleLog().log({
-              event: 'recovered',
-              sessionId: session.id,
-              name: session.name,
-            });
-            console.log(`[Server] Restored session ${session.id} from mux ${muxSession.muxName}`);
+            // Auto-attach PTY to the surviving tmux session immediately.
+            // This ensures ALL sessions resume capturing output right away,
+            // not just the one the client happens to select first.
+            try {
+              await session.startInteractive();
+              getLifecycleLog().log({
+                event: 'recovered',
+                sessionId: session.id,
+                name: session.name,
+              });
+              console.log(`[Server] Restored and attached session ${session.id} from mux ${muxSession.muxName}`);
+            } catch (attachErr) {
+              console.error(`[Server] Failed to attach session ${session.id}, keeping as detached:`, attachErr);
+              getLifecycleLog().log({
+                event: 'recovered',
+                sessionId: session.id,
+                name: session.name,
+              });
+            }
+
+            this.persistSessionState(session);
           }
         }