chore(a2a-server): if a2a task creation fails return error to user (#8106)

Co-authored-by: cornmander <shikhman@google.com>

packages/a2a-server/src/agent/executor.ts

@@ -36,6 +36,7 @@ import { loadSettings } from '../config/settings.js';
 import { loadExtensions } from '../config/extension.js';
 import { Task } from './task.js';
 import { requestStorage } from '../http/requestStorage.js';
+import { pushTaskStateFailed } from '../utils/executor_utils.js';
 
 /**
  * Provides a wrapper for Task. Passes data from Task to SDKTask.
@@ -116,8 +117,8 @@ export class CoderAgentExecutor implements AgentExecutor {
 
     const agentSettings = persistedState._agentSettings;
     const config = await this.getConfig(agentSettings, sdkTask.id);
-    const contextId =
-      (metadata['_contextId'] as string) || (sdkTask.contextId as string);
+    const contextId: string =
+      (metadata['_contextId'] as string) || sdkTask.contextId;
     const runtimeTask = await Task.create(
       sdkTask.id,
       contextId,
@@ -280,10 +281,10 @@ export class CoderAgentExecutor implements AgentExecutor {
     const sdkTask = requestContext.task as SDKTask | undefined;
 
     const taskId = sdkTask?.id || userMessage.taskId || uuidv4();
-    const contextId =
+    const contextId: string =
       userMessage.contextId ||
       sdkTask?.contextId ||
-      sdkTask?.metadata?.['_contextId'] ||
+      (sdkTask?.metadata?.['_contextId'] as string) ||
       uuidv4();
 
     logger.info(
@@ -381,12 +382,21 @@ export class CoderAgentExecutor implements AgentExecutor {
       const agentSettings = userMessage.metadata?.[
         'coderAgent'
       ] as AgentSettings;
-      wrapper = await this.createTask(
-        taskId,
-        contextId as string,
-        agentSettings,
-        eventBus,
-      );
+      try {
+        wrapper = await this.createTask(
+          taskId,
+          contextId,
+          agentSettings,
+          eventBus,
+        );
+      } catch (error) {
+        logger.error(
+          `[CoderAgentExecutor] Error creating task ${taskId}:`,
+          error,
+        );
+        pushTaskStateFailed(error, eventBus, taskId, contextId);
+        return;
+      }
       const newTaskSDK = wrapper.toSDKTask();
       eventBus.publish({
         ...newTaskSDK,