diff --git a/.changeset/acp-model-catalog-guard.md b/.changeset/acp-model-catalog-guard.md
new file mode 100644
index 000000000..16e6d3878
--- /dev/null
+++ b/.changeset/acp-model-catalog-guard.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Return an empty ACP model catalog when `config.models` is not a model map.
diff --git a/packages/acp-adapter/src/model-catalog.ts b/packages/acp-adapter/src/model-catalog.ts
index e126362b4..796f7da63 100644
--- a/packages/acp-adapter/src/model-catalog.ts
+++ b/packages/acp-adapter/src/model-catalog.ts
@@ -69,26 +69,33 @@ export function deriveAlwaysThinking(alias: ModelAlias): boolean {
 
 /**
  * Project `harness.getConfig().models` into a flat catalog. Returns an
- * empty array when the harness has no models configured, when
- * `getConfig` is missing on the harness (partial test stubs), or when
- * `getConfig` throws — letting the caller decide how to surface a
- * degenerate config without forcing every test stub to provide every
- * field.
+ * empty array when the harness has no models configured, when the
+ * `models` field is malformed, when `getConfig` is missing on the
+ * harness (partial test stubs), or when `getConfig` throws — letting
+ * the caller decide how to surface a degenerate config without forcing
+ * every test stub to provide every field.
  */
 export async function listModelsFromHarness(
   harness: KimiHarness,
 ): Promise<readonly AcpModelEntry[]> {
   if (typeof harness.getConfig !== 'function') return [];
-  let models: Record<string, ModelAlias> | undefined;
+  let models: unknown;
   try {
     const config = await harness.getConfig();
     models = config.models;
   } catch {
     return [];
   }
-  if (models === undefined) return [];
+  if (
+    models === undefined ||
+    models === null ||
+    typeof models !== 'object' ||
+    Array.isArray(models)
+  ) {
+    return [];
+  }
   const out: AcpModelEntry[] = [];
-  for (const [id, alias] of Object.entries(models)) {
+  for (const [id, alias] of Object.entries(models as Record<string, ModelAlias>)) {
     out.push({
       id,
       name: alias.displayName ?? alias.model ?? id,
diff --git a/packages/acp-adapter/test/model-catalog-list.test.ts b/packages/acp-adapter/test/model-catalog-list.test.ts
new file mode 100644
index 000000000..cb56f94cf
--- /dev/null
+++ b/packages/acp-adapter/test/model-catalog-list.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it } from 'vitest';
+
+import type { KimiHarness, ModelAlias } from '@moonshot-ai/kimi-code-sdk';
+
+import { listModelsFromHarness } from '../src/model-catalog';
+
+function harnessWithModels(models: unknown): KimiHarness {
+  return {
+    getConfig: async () => ({ models }),
+  } as unknown as KimiHarness;
+}
+
+describe('listModelsFromHarness', () => {
+  it('projects configured model aliases into ACP model entries', async () => {
+    const models: Record<string, ModelAlias> = {
+      coder: {
+        model: 'kimi-code',
+        displayName: 'Kimi Code',
+        capabilities: ['thinking'],
+      } as ModelAlias,
+    };
+
+    await expect(listModelsFromHarness(harnessWithModels(models))).resolves.toEqual([
+      {
+        id: 'coder',
+        name: 'Kimi Code',
+        thinkingSupported: true,
+        alwaysThinking: false,
+      },
+    ]);
+  });
+
+  it('returns an empty catalog for malformed models values', async () => {
+    await expect(listModelsFromHarness(harnessWithModels(null))).resolves.toEqual([]);
+    await expect(listModelsFromHarness(harnessWithModels('bad-models'))).resolves.toEqual([]);
+    await expect(listModelsFromHarness(harnessWithModels(['coder']))).resolves.toEqual([]);
+  });
+});