fix: isolate event hook failures during dispatch

src/plugin/event.test.ts

@@ -744,4 +744,66 @@ describe("createEventHandler - session recovery compaction", () => {
 		//#then - continue is still sent even when compaction fails
 		expect(callOrder).toEqual(["summarize", "prompt"])
 	})
+
+	it("continues dispatching later event hooks when an earlier hook throws", async () => {
+		//#given
+		const runtimeFallbackCalls: EventInput[] = []
+
+		const eventHandler = createEventHandler({
+			ctx: {
+				directory: "/tmp",
+				client: {
+					session: {
+						abort: async () => ({}),
+						prompt: async () => ({}),
+					},
+				},
+			} as any,
+			pluginConfig: {} as any,
+			firstMessageVariantGate: {
+				markSessionCreated: () => {},
+				clear: () => {},
+			},
+			managers: {
+				tmuxSessionManager: {
+					onSessionCreated: async () => {},
+					onSessionDeleted: async () => {},
+				},
+			} as any,
+			hooks: {
+				autoUpdateChecker: {
+					event: async () => {
+						throw new Error("upstream hook failed")
+					},
+				},
+				runtimeFallback: {
+					event: async (input: EventInput) => {
+						runtimeFallbackCalls.push(input)
+					},
+				},
+				stopContinuationGuard: { isStopped: () => false },
+			} as any,
+		})
+
+		//#when
+		let thrownError: unknown
+		try {
+			await eventHandler({
+				event: {
+					type: "session.error",
+					properties: {
+						sessionID: "ses_hook_isolation",
+						error: { name: "Error", message: "retry me" },
+					},
+				},
+			} as any)
+		} catch (error) {
+			thrownError = error
+		}
+
+		//#then
+		expect(thrownError).toBeUndefined()
+		expect(runtimeFallbackCalls).toHaveLength(1)
+		expect(runtimeFallbackCalls[0]?.event.type).toBe("session.error")
+	})
 })

src/plugin/event.ts

@@ -193,32 +193,68 @@ export function createEventHandler(args: {
     return "opencode";
   };
 
+  const getEventSessionID = (input: EventInput): string | undefined => {
+    const properties = input.event.properties;
+    if (
+      !properties ||
+      typeof properties !== "object" ||
+      !("sessionID" in properties) ||
+      typeof properties.sessionID !== "string"
+    ) {
+      return undefined;
+    }
+    return properties.sessionID;
+  };
+
+  const runEventHookSafely = async (
+    hookName: string,
+    handler: ((input: EventInput) => unknown | Promise<unknown>) | null | undefined,
+    input: EventInput,
+  ): Promise<void> => {
+    if (!handler) return;
+
+    try {
+      await Promise.resolve(handler(input));
+    } catch (error) {
+      log("[event] hook execution failed", {
+        hook: hookName,
+        eventType: input.event.type,
+        sessionID: getEventSessionID(input),
+        error,
+      });
+    }
+  };
+
   const dispatchToHooks = async (input: EventInput): Promise<void> => {
-    await Promise.resolve(hooks.autoUpdateChecker?.event?.(input));
-    await Promise.resolve(hooks.legacyPluginToast?.event?.(input));
-    await Promise.resolve(hooks.claudeCodeHooks?.event?.(input));
-    await Promise.resolve(hooks.backgroundNotificationHook?.event?.(input));
-    await Promise.resolve(hooks.sessionNotification?.(input));
-    await Promise.resolve(hooks.todoContinuationEnforcer?.handler?.(input));
-    await Promise.resolve(hooks.unstableAgentBabysitter?.event?.(input));
-    await Promise.resolve(hooks.contextWindowMonitor?.event?.(input));
-    await Promise.resolve(hooks.preemptiveCompaction?.event?.(input));
-    await Promise.resolve(hooks.directoryAgentsInjector?.event?.(input));
-    await Promise.resolve(hooks.directoryReadmeInjector?.event?.(input));
-    await Promise.resolve(hooks.rulesInjector?.event?.(input));
-    await Promise.resolve(hooks.thinkMode?.event?.(input));
-    await Promise.resolve(hooks.anthropicContextWindowLimitRecovery?.event?.(input));
-    await Promise.resolve(hooks.runtimeFallback?.event?.(input));
-    await Promise.resolve(hooks.agentUsageReminder?.event?.(input));
-    await Promise.resolve(hooks.categorySkillReminder?.event?.(input));
-    await Promise.resolve(hooks.interactiveBashSession?.event?.(input as EventInput));
-    await Promise.resolve(hooks.ralphLoop?.event?.(input));
-    await Promise.resolve(hooks.stopContinuationGuard?.event?.(input));
-    await Promise.resolve(hooks.compactionContextInjector?.event?.(input));
-    await Promise.resolve(hooks.compactionTodoPreserver?.event?.(input));
-    await Promise.resolve(hooks.writeExistingFileGuard?.event?.(input));
-    await Promise.resolve(hooks.atlasHook?.handler?.(input));
-    await Promise.resolve(hooks.autoSlashCommand?.event?.(input));
+    await runEventHookSafely("autoUpdateChecker", hooks.autoUpdateChecker?.event, input);
+    await runEventHookSafely("legacyPluginToast", hooks.legacyPluginToast?.event, input);
+    await runEventHookSafely("claudeCodeHooks", hooks.claudeCodeHooks?.event, input);
+    await runEventHookSafely("backgroundNotificationHook", hooks.backgroundNotificationHook?.event, input);
+    await runEventHookSafely("sessionNotification", hooks.sessionNotification, input);
+    await runEventHookSafely("todoContinuationEnforcer", hooks.todoContinuationEnforcer?.handler, input);
+    await runEventHookSafely("unstableAgentBabysitter", hooks.unstableAgentBabysitter?.event, input);
+    await runEventHookSafely("contextWindowMonitor", hooks.contextWindowMonitor?.event, input);
+    await runEventHookSafely("preemptiveCompaction", hooks.preemptiveCompaction?.event, input);
+    await runEventHookSafely("directoryAgentsInjector", hooks.directoryAgentsInjector?.event, input);
+    await runEventHookSafely("directoryReadmeInjector", hooks.directoryReadmeInjector?.event, input);
+    await runEventHookSafely("rulesInjector", hooks.rulesInjector?.event, input);
+    await runEventHookSafely("thinkMode", hooks.thinkMode?.event, input);
+    await runEventHookSafely(
+      "anthropicContextWindowLimitRecovery",
+      hooks.anthropicContextWindowLimitRecovery?.event,
+      input,
+    );
+    await runEventHookSafely("runtimeFallback", hooks.runtimeFallback?.event, input);
+    await runEventHookSafely("agentUsageReminder", hooks.agentUsageReminder?.event, input);
+    await runEventHookSafely("categorySkillReminder", hooks.categorySkillReminder?.event, input);
+    await runEventHookSafely("interactiveBashSession", hooks.interactiveBashSession?.event, input as EventInput);
+    await runEventHookSafely("ralphLoop", hooks.ralphLoop?.event, input);
+    await runEventHookSafely("stopContinuationGuard", hooks.stopContinuationGuard?.event, input);
+    await runEventHookSafely("compactionContextInjector", hooks.compactionContextInjector?.event, input);
+    await runEventHookSafely("compactionTodoPreserver", hooks.compactionTodoPreserver?.event, input);
+    await runEventHookSafely("writeExistingFileGuard", hooks.writeExistingFileGuard?.event, input);
+    await runEventHookSafely("atlasHook", hooks.atlasHook?.handler, input);
+    await runEventHookSafely("autoSlashCommand", hooks.autoSlashCommand?.event, input);
   };
 
   const recentSyntheticIdles = new Map<string, number>();