fix(anthropic): use beta models list method in beta runner

Author: cabljac

js/plugins/anthropic/src/list.ts

@@ -33,7 +33,8 @@ import { claudeModelReference } from './models.js';
 export async function listActions(
   client: Anthropic
 ): Promise<ActionMetadata[]> {
-  const clientModels = (await client.models.list()).data;
+  // Use beta.models.list to get the list of ALL (stable and beta) models
+  const clientModels = (await client.beta.models.list()).data;
   const seenNames = new Set<string>();
 
   return clientModels

js/plugins/anthropic/tests/index_test.ts

@@ -190,11 +190,11 @@ describe('Anthropic Plugin', () => {
     assert.ok(experimentalMetadata, 'Experimental model metadata should exist');
 
     // Verify mock was called
-    const listStub = mockClient.models.list as any;
+    const listStub = mockClient.beta.models.list as any;
     assert.strictEqual(
       listStub.mock.calls.length,
       1,
-      'models.list should be called once'
+      'beta.models.list should be called once'
     );
   });
 
@@ -224,11 +224,11 @@ describe('Anthropic Plugin', () => {
     );
 
     // Verify models.list was only called once due to caching
-    const listStub = mockClient.models.list as any;
+    const listStub = mockClient.beta.models.list as any;
     assert.strictEqual(
       listStub.mock.calls.length,
       1,
-      'models.list should only be called once due to caching'
+      'beta.models.list should only be called once due to caching'
     );
   });
 });

js/plugins/anthropic/tests/mocks/anthropic-client.ts

@@ -134,10 +134,10 @@ export function createMockAnthropicClient(
       create: createStub,
       stream: streamStub,
     },
-    models: {
-      list: listStub,
-    },
     beta: {
+      models: {
+        list: listStub,
+      },
       messages: {
         create: betaCreateStub,
         stream: betaStreamStub,