fix: prevent crash on /new with running background processes

package.json

@@ -39,15 +39,15 @@
     "typebox": "^1.0.0"
   },
   "peerDependencies": {
-    "@mariozechner/pi-coding-agent": "0.69.0",
-    "@mariozechner/pi-tui": "0.69.0"
+    "@mariozechner/pi-coding-agent": "0.72.1",
+    "@mariozechner/pi-tui": "0.72.1"
   },
   "devDependencies": {
     "@aliou/biome-plugins": "^0.3.2",
     "@biomejs/biome": "^2.3.13",
     "@changesets/cli": "^2.27.11",
-    "@mariozechner/pi-ai": "0.69.0",
-    "@mariozechner/pi-coding-agent": "0.69.0",
+    "@mariozechner/pi-ai": "0.72.1",
+    "@mariozechner/pi-coding-agent": "0.72.1",
     "@types/node": "^25.0.10",
     "husky": "^9.1.7",
     "typescript": "^5.9.3",

src/hooks/process-end.ts

@@ -2,6 +2,7 @@ import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
 import { MESSAGE_TYPE_PROCESS_UPDATE, type ProcessInfo } from "../constants";
 import type { ProcessManager } from "../manager";
 import { formatRuntime } from "../utils";
+import { safeSendMessage } from "./utils";
 
 interface ProcessUpdateDetails {
   kind: "lifecycle";
@@ -54,7 +55,8 @@ export function setupProcessEndHook(pi: ExtensionAPI, manager: ProcessManager) {
       runtime,
     };
 
-    pi.sendMessage(
+    safeSendMessage(
+      pi,
       {
         customType: MESSAGE_TYPE_PROCESS_UPDATE,
         content: message,

src/hooks/process-watch.ts

@@ -1,6 +1,7 @@
 import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
 import { MESSAGE_TYPE_PROCESS_UPDATE } from "../constants";
 import type { ProcessManager } from "../manager";
+import { safeSendMessage } from "./utils";
 
 interface ProcessWatchUpdateDetails {
   kind: "watch_matched";
@@ -70,7 +71,8 @@ export function setupProcessWatchHook(
       }
     }
 
-    pi.sendMessage(
+    safeSendMessage(
+      pi,
       {
         customType: MESSAGE_TYPE_PROCESS_UPDATE,
         content: message,

src/hooks/utils.ts

@@ -0,0 +1,23 @@
+import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+
+/**
+ * Send a message via pi, swallowing stale-context errors.
+ *
+ * After /new, /resume, or /fork, the pi proxy is invalidated and all
+ * method calls throw. This wrapper catches that specific error so the
+ * extension doesn't crash — the event is simply lost for the old session.
+ */
+export function safeSendMessage(
+  pi: ExtensionAPI,
+  message: Parameters<ExtensionAPI["sendMessage"]>[0],
+  options?: Parameters<ExtensionAPI["sendMessage"]>[1],
+): void {
+  try {
+    pi.sendMessage(message, options);
+  } catch (err: unknown) {
+    if (err instanceof Error && err.message.includes("stale")) {
+      return;
+    }
+    throw err;
+  }
+}