feat(anthropic): Add support for container reuse for code execution (#9109)

Author: pokey

libs/providers/langchain-anthropic/src/chat_models.ts

@@ -63,6 +63,11 @@ export interface ChatAnthropicCallOptions
    * when making a request.
    */
   headers?: Record<string, string>;
+  /**
+   * Container ID for file persistence across turns with code execution.
+   * Used with the code_execution_20250825 tool.
+   */
+  container?: string;
 }
 
 function _toolsInParams(
@@ -868,6 +873,7 @@ export class ChatAnthropicMessages<
         thinking: this.thinking,
         context_management: this.contextManagement,
         ...this.invocationKwargs,
+        container: options?.container,
       };
     }
     return {
@@ -883,6 +889,7 @@ export class ChatAnthropicMessages<
       thinking: this.thinking,
       context_management: this.contextManagement,
       ...this.invocationKwargs,
+      container: options?.container,
     };
   }
 

libs/providers/langchain-anthropic/src/tests/chat_models.test.ts

@@ -192,6 +192,44 @@ test("Can properly format anthropic messages when given two tool results", async
   });
 });
 
+test("invocationParams includes container when provided in call options", () => {
+  const model = new ChatAnthropic({
+    modelName: "claude-3-haiku-20240307",
+    temperature: 0,
+    anthropicApiKey: "testing",
+  });
+
+  const params = model.invocationParams({ container: "container_123" });
+
+  expect(params.container).toBe("container_123");
+});
+
+test("invocationParams does not include container when not provided", () => {
+  const model = new ChatAnthropic({
+    modelName: "claude-3-haiku-20240307",
+    temperature: 0,
+    anthropicApiKey: "testing",
+  });
+
+  const params = model.invocationParams({});
+
+  expect(params.container).toBeUndefined();
+});
+
+test("invocationParams includes container with thinking enabled", () => {
+  const model = new ChatAnthropic({
+    modelName: "claude-3-haiku-20240307",
+    temperature: 1,
+    anthropicApiKey: "testing",
+    thinking: { type: "enabled", budget_tokens: 1000 },
+  });
+
+  const params = model.invocationParams({ container: "container_456" });
+
+  expect(params.container).toBe("container_456");
+  expect(params.thinking).toEqual({ type: "enabled", budget_tokens: 1000 });
+});
+
 test("Can properly format messages with container_upload blocks", async () => {
   const messageHistory = [
     new HumanMessage({