fix(js/plugins/anthropic): remove duplicated keys maxOutputTokens, etc

js/plugins/anthropic/src/runner/beta.ts

@@ -324,16 +324,19 @@ export class BetaRunner extends BaseRunner<BetaRunnerTypes> {
       topK,
       apiVersion: _1,
       thinking: _2,
+      maxOutputTokens,
+      stopSequences,
+      version,
+      apiKey,
       ...restConfig
     } = request.config ?? {};
 
     const body = {
       model: mappedModelName,
-      max_tokens:
-        request.config?.maxOutputTokens ?? this.DEFAULT_MAX_OUTPUT_TOKENS,
+      max_tokens: maxOutputTokens ?? this.DEFAULT_MAX_OUTPUT_TOKENS,
       messages,
       system: system as BetaTextBlockParam[],
-      stop_sequences: request.config?.stopSequences,
+      stop_sequences: stopSequences,
       temperature: request.config?.temperature,
       top_k: topK,
       top_p: topP,
@@ -381,17 +384,20 @@ export class BetaRunner extends BaseRunner<BetaRunnerTypes> {
       topK,
       apiVersion: _1,
       thinking: _2,
+      maxOutputTokens,
+      stopSequences,
+      version,
+      apiKey,
       ...restConfig
     } = request.config ?? {};
 
     const body = {
       model: mappedModelName,
-      max_tokens:
-        request.config?.maxOutputTokens ?? this.DEFAULT_MAX_OUTPUT_TOKENS,
+      max_tokens: maxOutputTokens ?? this.DEFAULT_MAX_OUTPUT_TOKENS,
       messages,
       stream: true,
       system: system as BetaTextBlockParam[],
-      stop_sequences: request.config?.stopSequences,
+      stop_sequences: stopSequences,
       temperature: request.config?.temperature,
       top_k: topK,
       top_p: topP,

js/plugins/anthropic/src/runner/stable.ts

@@ -243,16 +243,19 @@ export class Runner extends BaseRunner<RunnerTypes> {
       topK,
       apiVersion: _1,
       thinking: _2,
+      maxOutputTokens,
+      stopSequences,
+      version,
+      apiKey,
       ...restConfig
     } = request.config ?? {};
 
     const body: MessageCreateParamsNonStreaming = {
       model: mappedModelName,
-      max_tokens:
-        request.config?.maxOutputTokens ?? this.DEFAULT_MAX_OUTPUT_TOKENS,
+      max_tokens: maxOutputTokens ?? this.DEFAULT_MAX_OUTPUT_TOKENS,
       messages,
       system: system as TextBlockParam[],
-      stop_sequences: request.config?.stopSequences,
+      stop_sequences: stopSequences,
       temperature: request.config?.temperature,
       top_k: topK,
       top_p: topP,
@@ -294,6 +297,10 @@ export class Runner extends BaseRunner<RunnerTypes> {
       topK,
       apiVersion: _1,
       thinking: _2,
+      maxOutputTokens,
+      stopSequences,
+      version,
+      apiKey,
       ...restConfig
     } = request.config ?? {};
 

js/plugins/anthropic/tests/beta_runner_test.ts

@@ -626,6 +626,42 @@ describe('BetaRunner', () => {
     );
   });
 
+  it('should not leak maxOutputTokens, stopSequences, version, or apiKey into the request body', () => {
+    const mockClient = createMockAnthropicClient();
+    const runner = new BetaRunner({
+      name: 'claude-3-5-haiku',
+      client: mockClient as Anthropic,
+    }) as any;
+
+    const body = runner.toAnthropicRequestBody(
+      'claude-3-5-haiku',
+      {
+        messages: [],
+        config: {
+          maxOutputTokens: 100,
+          stopSequences: ['END'],
+          version: 'claude-3-5-haiku-custom',
+          apiKey: 'fake-api-key',
+          temperature: 0.5,
+        },
+      } satisfies any,
+      false
+    );
+
+    assert.deepStrictEqual(body, {
+      model: 'claude-3-5-haiku-custom',
+      max_tokens: 100,
+      messages: [],
+      stop_sequences: ['END'],
+      temperature: 0.5,
+      betas: [
+        'files-api-2025-04-14',
+        'effort-2025-11-24',
+        'structured-outputs-2025-11-13',
+      ],
+    });
+  });
+
   it('should throw for unsupported mcp tool use blocks', () => {
     const mockClient = createMockAnthropicClient();
     const runner = new BetaRunner({

js/plugins/anthropic/tests/stable_runner_test.ts

@@ -2545,6 +2545,33 @@ describe('Runner request bodies and error branches', () => {
     assert.deepStrictEqual(body.thinking, { type: 'disabled' });
   });
 
+  it('should not leak maxOutputTokens, stopSequences, version, or apiKey into the request body', () => {
+    const mockClient = createMockAnthropicClient();
+    const runner = new Runner({
+      name: 'claude-3-5-haiku',
+      client: mockClient,
+    }) as Runner & RunnerProtectedMethods;
+
+    const body = runner['toAnthropicRequestBody']('claude-3-5-haiku', {
+      messages: [],
+      config: {
+        maxOutputTokens: 100,
+        stopSequences: ['END'],
+        version: 'claude-3-5-haiku-custom',
+        apiKey: 'fake-api-key',
+        temperature: 0.5,
+      },
+    } as unknown as GenerateRequest<typeof AnthropicConfigSchema>);
+
+    assert.deepStrictEqual(body, {
+      model: 'claude-3-5-haiku-custom',
+      max_tokens: 100,
+      messages: [],
+      stop_sequences: ['END'],
+      temperature: 0.5,
+    });
+  });
+
   it('should throw descriptive errors for missing tool refs', () => {
     const mockClient = createMockAnthropicClient();
     const runner = new Runner({