diff --git a/config/platform-infra/webterm.yaml b/config/platform-infra/webterm.yaml
index 99ea8552..ee329bb4 100644
--- a/config/platform-infra/webterm.yaml
+++ b/config/platform-infra/webterm.yaml
@@ -68,6 +68,7 @@ targets:
           cols: 100
           rows: 30
           resumePrompt: true
+          fallbackShell: true
       environment:
         HOST: 0.0.0.0
         PORT: "7681"
@@ -148,18 +149,21 @@ targets:
           cols: 100
           rows: 30
           resumePrompt: true
+          fallbackShell: true
         - title: CONSTAR
           cwd: /root/unidesk
           command: mycx resume 019f4b5f-b5ce-76b3-8ccb-508790e9662d
           cols: 100
           rows: 30
           resumePrompt: true
+          fallbackShell: true
         - title: WORKBENCH
           cwd: /root/unidesk
           command: mycx resume 019f4a1a-fd46-7662-8dc2-bf628210739d
           cols: 100
           rows: 30
           resumePrompt: true
+          fallbackShell: true
       environment:
         HOST: 0.0.0.0
         PORT: "7681"
diff --git a/scripts/src/platform-infra-webterm.ts b/scripts/src/platform-infra-webterm.ts
index a7cbafcd..76bf1a8c 100644
--- a/scripts/src/platform-infra-webterm.ts
+++ b/scripts/src/platform-infra-webterm.ts
@@ -56,7 +56,7 @@ interface WebtermTarget {
     privileged: boolean;
     pid: "host" | "container";
     sourceMounts: Array<{ source: string; target: string; readOnly: boolean }>;
-    autoStartSessions: Array<{ title: string; cwd: string; command: string; cols: number; rows: number; resumePrompt: boolean }>;
+    autoStartSessions: Array<{ title: string; cwd: string; command: string; cols: number; rows: number; resumePrompt: boolean; fallbackShell: boolean }>;
     sessionStartModes: SessionStartModes;
     autoResumePrompt: AutoResumePrompt;
     environment: Record<string, string>;
@@ -370,11 +370,14 @@ function resumeCommandWithPrompt(
   session: WebtermTarget["runtime"]["autoStartSessions"][number],
   prompt: AutoResumePrompt,
 ): string {
-  if (!session.resumePrompt) return session.command;
-  if (!/^\s*(?:mycx|oncx)\s+resume\s+\S+\s*$/.test(session.command)) {
-    throw new Error(`resumePrompt requires a mycx/oncx resume command: ${session.title}`);
+  let command = session.command.trim();
+  if (session.resumePrompt) {
+    if (!/^\s*(?:mycx|oncx)\s+resume\s+\S+\s*$/.test(session.command)) {
+      throw new Error(`resumePrompt requires a mycx/oncx resume command: ${session.title}`);
+    }
+    command = `${command} ${quoteShellArg(prompt.prompt)}`;
   }
-  return `${session.command.trim()} ${quoteShellArg(prompt.prompt)}`;
+  return session.fallbackShell ? `${command}; exec /bin/bash -l` : command;
 }
 
 function quoteShellArg(value: string): string {
@@ -554,6 +557,7 @@ function parseAutoStartSessions(value: unknown, path: string): WebtermTarget["ru
       cols: integerField(record, "cols", itemPath),
       rows: integerField(record, "rows", itemPath),
       resumePrompt: booleanField(record, "resumePrompt", itemPath),
+      fallbackShell: booleanField(record, "fallbackShell", itemPath),
     };
   });
 }