openai[minor],docs[minor]: Add parallel tool calls call option and docs

docs/core_docs/docs/integrations/chat/openai.mdx

@@ -138,3 +138,16 @@ import OpenAIStreamTokens from "@examples/models/chat/integration_openai_stream_
 :::tip
 See the LangSmith trace [here](https://smith.langchain.com/public/66bf7377-cc69-4676-91b6-25929a05e8b7/r)
 :::
+
+### Disabling parallel tool calls
+
+If you have multiple tools bound to the model, but you'd only like for a single tool to be called at a time, you can pass the `parallel_tool_calls` call option to enable/disable this behavior.
+By default, `parallel_tool_calls` is set to `true`.
+
+import OpenAIParallelToolCallsTokens from "@examples/models/chat/integration_openai_parallel_tool_calls.ts";
+
+<CodeBlock language="typescript">{OpenAIParallelToolCallsTokens}</CodeBlock>
+
+:::tip
+See the LangSmith trace for the first invocation [here](https://smith.langchain.com/public/68f2ff13-6331-47d8-a8c0-d1745788e84e/r) and the second invocation [here](https://smith.langchain.com/public/6c2fff29-9470-486a-8715-805fda631024/r)
+:::

examples/src/models/chat/integration_openai_parallel_tool_calls.ts

@@ -0,0 +1,85 @@
+import { ChatOpenAI } from "@langchain/openai";
+import { z } from "zod";
+import { zodToJsonSchema } from "zod-to-json-schema";
+
+const model = new ChatOpenAI({
+  temperature: 0,
+  model: "gpt-4o"
+});
+
+// Define your tools
+const calculatorSchema = z
+.object({
+  operation: z.enum(["add", "subtract", "multiply", "divide"]),
+  number1: z.number(),
+  number2: z.number(),
+})
+.describe("A tool to perform basic arithmetic operations");
+const weatherSchema = z
+.object({
+  city: z.enum(["add", "subtract", "multiply", "divide"]),
+})
+.describe("A tool to get the weather in a city");
+
+// Bind tools to the model
+const modelWithTools = model.bindTools([
+  {
+    type: "function",
+    function: {
+      name: "calculator",
+      description: calculatorSchema.description,
+      parameters: zodToJsonSchema(calculatorSchema),
+    },
+  },
+  {
+    type: "function",
+    function: {
+      name: "weather",
+      description: weatherSchema.description,
+      parameters: zodToJsonSchema(weatherSchema),
+    },
+  },
+]);
+
+// Invoke the model with `parallel_tool_calls` set to `true`
+const response = await modelWithTools.invoke(
+  ["What is the weather in san francisco and what is 23716 times 27342?"],
+  {
+    parallel_tool_calls: true,
+  }
+);
+console.log(response.tool_calls);
+// We can see it called two tools
+/*
+[
+  {
+    name: 'weather',
+    args: { city: 'san francisco' },
+    id: 'call_c1KymEIix7mdlFtgLSnTXmDc'
+  },
+  {
+    name: 'calculator',
+    args: { operation: 'multiply', number1: 23716, number2: 27342 },
+    id: 'call_ANLYclAmXQ4TwUCLXakbPr3Z'
+  }
+]
+*/
+
+// Invoke the model with `parallel_tool_calls` set to `false`
+const response2 = await modelWithTools.invoke(
+  ["What is the weather in san francisco and what is 23716 times 27342?"],
+  {
+    parallel_tool_calls: false,
+  }
+);
+console.log(response2.tool_calls);
+// We can see it called one tool
+/*
+[
+  {
+    name: 'weather',
+    args: { city: 'san francisco' },
+    id: 'call_Rk34XffawJjgZ2BCK9E4CwlT'
+  }
+]
+*/

libs/langchain-openai/package.json

@@ -37,7 +37,7 @@
   "dependencies": {
     "@langchain/core": ">=0.2.5 <0.3.0",
     "js-tiktoken": "^1.0.12",
-    "openai": "^4.41.1",
+    "openai": "^4.49.1",
     "zod": "^3.22.4",
     "zod-to-json-schema": "^3.22.3"
   },

libs/langchain-openai/src/chat_models.ts

@@ -253,7 +253,22 @@ export interface ChatOpenAICallOptions
   promptIndex?: number;
   response_format?: { type: "json_object" };
   seed?: number;
-  stream_options?: { include_usage: boolean };
+  /**
+   * Additional options to pass to streamed completions.
+   */
+  stream_options?: {
+    /**
+     * Whether or not to include token usage in the stream.
+     * If set to `true`, this will include an additional
+     * chunk at the end of the stream with the token usage.
+     */
+    include_usage: boolean;
+  };
+  /**
+   * Whether or not to restrict the ability to
+   * call multiple tools in one response.
+   */
+  parallel_tool_calls?: boolean;
 }
 
 /**
@@ -557,6 +572,7 @@ export class ChatOpenAI<
       ...(options?.stream_options !== undefined
         ? { stream_options: options.stream_options }
         : {}),
+      parallel_tool_calls: options?.parallel_tool_calls,
       ...this.modelKwargs,
     };
     return params;

libs/langchain-openai/src/tests/chat_models_structured_output.int.test.ts

@@ -274,3 +274,49 @@ test("withStructuredOutput includeRaw true", async () => {
       JSON.parse(raw.additional_kwargs.tool_calls?.[0].function.arguments ?? "")
   ).toBe(true);
 });
+
+test.only("parallelToolCalls param", async () => {
+  const calculatorSchema = z
+    .object({
+      operation: z.enum(["add", "subtract", "multiply", "divide"]),
+      number1: z.number(),
+      number2: z.number(),
+    })
+    .describe("A tool to perform basic arithmetic operations");
+  const weatherSchema = z
+    .object({
+      city: z.enum(["add", "subtract", "multiply", "divide"]),
+    })
+    .describe("A tool to get the weather in a city");
+
+  const model = new ChatOpenAI({
+    model: "gpt-4o",
+    temperature: 0,
+  }).bindTools([
+    {
+      type: "function",
+      function: {
+        name: "calculator",
+        description: calculatorSchema.description,
+        parameters: zodToJsonSchema(calculatorSchema),
+      },
+    },
+    {
+      type: "function",
+      function: {
+        name: "weather",
+        description: weatherSchema.description,
+        parameters: zodToJsonSchema(weatherSchema),
+      },
+    },
+  ]);
+
+  const response = await model.invoke(
+    ["What is the weather in san francisco and what is 23716 times 27342?"],
+    {
+      parallel_tool_calls: false,
+    }
+  );
+  console.log(response.tool_calls);
+  expect(response.tool_calls?.length).toBe(1);
+});

yarn.lock

@@ -10066,7 +10066,7 @@ __metadata:
     jest: ^29.5.0
     jest-environment-node: ^29.6.4
     js-tiktoken: ^1.0.12
-    openai: ^4.41.1
+    openai: ^4.49.1
     prettier: ^2.8.3
     release-it: ^15.10.1
     rimraf: ^5.0.1
@@ -30529,6 +30529,24 @@ __metadata:
   languageName: node
   linkType: hard
 
+"openai@npm:^4.49.1":
+  version: 4.49.1
+  resolution: "openai@npm:4.49.1"
+  dependencies:
+    "@types/node": ^18.11.18
+    "@types/node-fetch": ^2.6.4
+    abort-controller: ^3.0.0
+    agentkeepalive: ^4.2.1
+    form-data-encoder: 1.7.2
+    formdata-node: ^4.3.2
+    node-fetch: ^2.6.7
+    web-streams-polyfill: ^3.2.1
+  bin:
+    openai: bin/cli
+  checksum: b9bc845d25412d6b6ad827fb1363a4029935d8eb85a8708e55f5cf2852a0551b8720c8099edcbb0a2c2ab2be2d8f652a97061d9898b908e29d9bb2f727304b6e
+  languageName: node
+  linkType: hard
+
 "openapi-types@npm:^12.1.3":
   version: 12.1.3
   resolution: "openapi-types@npm:12.1.3"