fix(interactive-subagents): harden parallel lifecycle delivery

2026-09-03 23:40:14 -04:00
parent d99dbce93d
commit 7a1043e5e0
11 changed files with 848 additions and 131 deletions
@@ -166,13 +166,35 @@ export async function readScreenAsync(surface: string, lines = 50): Promise<stri
  return stdout;
 }

+export async function isSurfaceAlive(surface: string, signal?: AbortSignal): Promise<boolean> {
+  try {
+    requireHerdr();
+    await execFileAsync(
+      "herdr",
+      ["pane", "read", surface, "--source", "recent-unwrapped", "--lines", "1"],
+      { encoding: "utf8", timeout: 5_000, killSignal: "SIGKILL", signal },
+    );
+    return true;
+  } catch {
+    return false;
+  }
+}
+
 export function closeSurface(surface: string): void {
  requireHerdr();
  const tabId = tabByPane.get(surface);
  if (tabId) {
-    execFileSync("herdr", ["tab", "close", tabId], { encoding: "utf8" });
+    try {
+      execFileSync("herdr", ["tab", "close", tabId], { encoding: "utf8" });
+    } catch {
+      // Replaced-shell launches may close their own tab before watcher cleanup.
+    }
    tabByPane.delete(surface);
    return;
  }
-  execFileSync("herdr", ["pane", "close", surface], { encoding: "utf8" });
+  try {
+    execFileSync("herdr", ["pane", "close", surface], { encoding: "utf8" });
+  } catch {
+    // Closing an already-ended pane is idempotent cleanup.
+  }
 }