diff --git a/.changeset/media-registrar-stale-alias.md b/.changeset/media-registrar-stale-alias.md
new file mode 100644
index 000000000..692785e5b
--- /dev/null
+++ b/.changeset/media-registrar-stale-alias.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Fix an `[unexpected] Error2: Model "<alias>" is not configured in config.toml` error printed on startup when a restored session references a model that is no longer configured (e.g. after logging out of the managed Kimi Code account). Media tool registration now degrades gracefully instead of throwing from the `agent.status.updated` listener.
diff --git a/packages/agent-core-v2/src/agent/media/mediaToolsRegistrar.ts b/packages/agent-core-v2/src/agent/media/mediaToolsRegistrar.ts
index 15f7df2db..90818fa8d 100644
--- a/packages/agent-core-v2/src/agent/media/mediaToolsRegistrar.ts
+++ b/packages/agent-core-v2/src/agent/media/mediaToolsRegistrar.ts
@@ -17,6 +17,14 @@
  * converts `video_url` takes the inline fallback when no upload hook
  * exists.
  *
+ * The alias re-resolved on every refresh comes from persisted profile
+ * state that resume replays without catalog validation, so it may no
+ * longer resolve (e.g. its config.toml entry was removed on logout).
+ * A failed resolution degrades to "no model" — registration proceeds
+ * from the profile-reported capabilities without a model-bound video
+ * uploader — instead of throwing out of the event listener, where the
+ * escape would surface as an `[unexpected]` error.
+ *
  * The plain-data state (`registeredKey`) is registered into `agentState`
  * (`IAgentStateService`) and read/written through it; `registration` stays an
  * instance field (the live `IDisposable` tool-registration handle, not plain
@@ -125,8 +133,13 @@ export class AgentMediaToolsRegistrar extends Service implements IAgentMediaTool
     let requester: ModelRequester | undefined;
     let model: Model | undefined;
     if (modelAlias !== '') {
-      requester = this.modelCatalog.getRequester(modelAlias);
-      model = requester.model;
+      try {
+        requester = this.modelCatalog.getRequester(modelAlias);
+        model = requester.model;
+      } catch {
+        requester = undefined;
+        model = undefined;
+      }
     }
     this.registration = registerMediaTools(this.toolRegistry, {
       runtime,
diff --git a/packages/agent-core-v2/test/agent/media/tools/read-media.test.ts b/packages/agent-core-v2/test/agent/media/tools/read-media.test.ts
index 7f256580f..14ddd1575 100644
--- a/packages/agent-core-v2/test/agent/media/tools/read-media.test.ts
+++ b/packages/agent-core-v2/test/agent/media/tools/read-media.test.ts
@@ -9,13 +9,17 @@
 
 import * as posixPath from 'node:path/posix';
 
-import type { ModelCapability } from '#/kosong/contract/capability';
+import { UNKNOWN_CAPABILITY, type ModelCapability } from '#/kosong/contract/capability';
 import type { ContentPart } from '#/kosong/contract/message';
 import { VideoUploadUnsupportedError } from '#/kosong/contract/errors';
 import { Jimp } from 'jimp';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 
 import { Emitter } from '#/_base/event';
+import {
+  resetUnexpectedErrorHandler,
+  setUnexpectedErrorHandler,
+} from '#/_base/errors/unexpectedError';
 import type { IHostFileSystem } from '#/os/interface/hostFileSystem';
 import type { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import type { IAgentRuntimeService } from '#/agent/runtimeBinding/agentRuntime';
@@ -873,10 +877,14 @@ describe('AgentMediaToolsRegistrar', () => {
       getModelCapabilities: () => state.capabilities,
       getModel: () => state.alias,
     } as unknown as IAgentProfileService;
+    const brokenAliases = new Set<string>();
     const modelCatalog = {
-      getRequester: (id: string) => ({
-        model: { id, name: id, providerName: 'test', protocol: 'openai' },
-      }),
+      getRequester: (id: string) => {
+        if (brokenAliases.has(id)) {
+          throw new Error(`Model "${id}" is not configured in config.toml.`);
+        }
+        return { model: { id, name: id, providerName: 'test', protocol: 'openai' } };
+      },
     } as unknown as IModelCatalog;
     const workspaceCtx = {
       workDir: '/workspace',
@@ -916,7 +924,13 @@ describe('AgentMediaToolsRegistrar', () => {
       runtimeAvailable = available;
       runtimeChanges.fire();
     };
-    return { registry, registrar, bindModel, setRuntimeAvailable };
+    const breakAlias = (alias: string): void => {
+      brokenAliases.add(alias);
+    };
+    const healAlias = (alias: string): void => {
+      brokenAliases.delete(alias);
+    };
+    return { registry, registrar, bindModel, setRuntimeAvailable, breakAlias, healAlias };
   }
 
   it('registers nothing until a media-capable model binds, then registers ReadMediaFile', () => {
@@ -970,6 +984,25 @@ describe('AgentMediaToolsRegistrar', () => {
     expect(registry.resolve('ReadMediaFile')).toBe(first);
   });
 
+  it('survives an unconfigured bound alias and recovers when it resolves again', () => {
+    const unexpected: unknown[] = [];
+    setUnexpectedErrorHandler((err) => unexpected.push(err));
+    try {
+      const { registry, bindModel, breakAlias, healAlias } = createRegistrarHarness();
+      breakAlias('stale-model');
+      bindModel('stale-model', UNKNOWN_CAPABILITY);
+      expect(unexpected).toHaveLength(0);
+      expect(registry.resolve('ReadMediaFile')).toBeUndefined();
+
+      healAlias('stale-model');
+      bindModel('stale-model', capabilities({ image_in: true, video_in: true }));
+      expect(registry.resolve('ReadMediaFile')).toBeInstanceOf(ReadMediaFileTool);
+      expect(unexpected).toHaveLength(0);
+    } finally {
+      resetUnexpectedErrorHandler();
+    }
+  });
+
   it('unregisters on dispose', () => {
     const { registry, registrar, bindModel } = createRegistrarHarness();
     bindModel('vision-model', capabilities({ image_in: true, video_in: true }));