diff --git a/packages/core/src/agents/registry.test.ts b/packages/core/src/agents/registry.test.ts
index 7c856e4089..edae478f2a 100644
--- a/packages/core/src/agents/registry.test.ts
+++ b/packages/core/src/agents/registry.test.ts
@@ -664,6 +664,30 @@ describe('AgentRegistry', () => {
       );
     });
 
+    it('should surface an error if remote agent registration fails', async () => {
+      const remoteAgent: AgentDefinition = {
+        kind: 'remote',
+        name: 'FailingRemoteAgent',
+        description: 'A remote agent',
+        agentCardUrl: 'https://example.com/card',
+        inputConfig: { inputSchema: { type: 'object' } },
+      };
+
+      const error = new Error('401 Unauthorized');
+      vi.mocked(A2AClientManager.getInstance).mockReturnValue({
+        loadAgent: vi.fn().mockRejectedValue(error),
+      } as unknown as A2AClientManager);
+
+      const feedbackSpy = vi.spyOn(coreEvents, 'emitFeedback');
+
+      await registry.testRegisterAgent(remoteAgent);
+
+      expect(feedbackSpy).toHaveBeenCalledWith(
+        'error',
+        `Error loading A2A agent "FailingRemoteAgent": 401 Unauthorized`,
+      );
+    });
+
     it('should merge user and agent description and skills when registering a remote agent', async () => {
       const remoteAgent: AgentDefinition = {
         kind: 'remote',
diff --git a/packages/core/src/agents/registry.ts b/packages/core/src/agents/registry.ts
index d9de43eb63..bf7e669150 100644
--- a/packages/core/src/agents/registry.ts
+++ b/packages/core/src/agents/registry.ts
@@ -119,7 +119,20 @@ export class AgentRegistry {
       coreEvents.emitFeedback('error', `Agent loading error: ${error.message}`);
     }
     await Promise.allSettled(
-      userAgents.agents.map((agent) => this.registerAgent(agent)),
+      userAgents.agents.map(async (agent) => {
+        try {
+          await this.registerAgent(agent);
+        } catch (e) {
+          debugLogger.warn(
+            `[AgentRegistry] Error registering user agent "${agent.name}":`,
+            e,
+          );
+          coreEvents.emitFeedback(
+            'error',
+            `Error registering user agent "${agent.name}": ${e instanceof Error ? e.message : String(e)}`,
+          );
+        }
+      }),
     );
 
     // Load project-level agents: .gemini/agents/ (relative to Project Root)
@@ -174,7 +187,20 @@ export class AgentRegistry {
       }
 
       await Promise.allSettled(
-        agentsToRegister.map((agent) => this.registerAgent(agent)),
+        agentsToRegister.map(async (agent) => {
+          try {
+            await this.registerAgent(agent);
+          } catch (e) {
+            debugLogger.warn(
+              `[AgentRegistry] Error registering project agent "${agent.name}":`,
+              e,
+            );
+            coreEvents.emitFeedback(
+              'error',
+              `Error registering project agent "${agent.name}": ${e instanceof Error ? e.message : String(e)}`,
+            );
+          }
+        }),
       );
     } else {
       coreEvents.emitFeedback(
@@ -187,7 +213,20 @@ export class AgentRegistry {
     for (const extension of this.config.getExtensions()) {
       if (extension.isActive && extension.agents) {
         await Promise.allSettled(
-          extension.agents.map((agent) => this.registerAgent(agent)),
+          extension.agents.map(async (agent) => {
+            try {
+              await this.registerAgent(agent);
+            } catch (e) {
+              debugLogger.warn(
+                `[AgentRegistry] Error registering extension agent "${agent.name}":`,
+                e,
+              );
+              coreEvents.emitFeedback(
+                'error',
+                `Error registering extension agent "${agent.name}": ${e instanceof Error ? e.message : String(e)}`,
+              );
+            }
+          }),
         );
       }
     }
@@ -424,10 +463,9 @@ export class AgentRegistry {
       this.agents.set(definition.name, definition);
       this.addAgentPolicy(definition);
     } catch (e) {
-      debugLogger.warn(
-        `[AgentRegistry] Error loading A2A agent "${definition.name}":`,
-        e,
-      );
+      const errorMessage = `Error loading A2A agent "${definition.name}": ${e instanceof Error ? e.message : String(e)}`;
+      debugLogger.warn(`[AgentRegistry] ${errorMessage}`, e);
+      coreEvents.emitFeedback('error', errorMessage);
     }
   }