MRKL prompt fix, integration test (#1138)

* MRKL prompt fix, integration test

* Lint and format

---------

Co-authored-by: Jacob Lee <jacob@autocode.com>

docs/docs/modules/agents/tools/webbrowser.mdx

@@ -9,7 +9,7 @@ import CodeBlock from "@theme/CodeBlock";
 The Webbrowser Tool gives your agent the ability to visit a website and extract information. It is described to the agent as
 
 ```
-useful for when you need to find something on or summarize a webpage. input should be a comma seperated list of "valid URL including protocol","what you want to find on the page or empty string for a summary".
+useful for when you need to find something on or summarize a webpage. input should be a comma separated list of "valid URL including protocol","what you want to find on the page or empty string for a summary".
 ```
 
 It exposes two modes of operation:

examples/src/agents/custom_llm_agent.ts

@@ -22,7 +22,9 @@ import { SerpAPI, Tool } from "langchain/tools";
 import { Calculator } from "langchain/tools/calculator";
 
 const PREFIX = `Answer the following questions as best you can. You have access to the following tools:`;
-const formatInstructions = (toolNames: string) => `Use the following format:
+const formatInstructions = (
+  toolNames: string
+) => `Use the following format in your response:
 
 Question: the input question you must answer
 Thought: you should always think about what to do

examples/src/agents/custom_llm_agent_chat.ts

@@ -24,7 +24,9 @@ import { SerpAPI, Tool } from "langchain/tools";
 import { Calculator } from "langchain/tools/calculator";
 
 const PREFIX = `Answer the following questions as best you can. You have access to the following tools:`;
-const formatInstructions = (toolNames: string) => `Use the following format:
+const formatInstructions = (
+  toolNames: string
+) => `Use the following format in your response:
 
 Question: the input question you must answer
 Thought: you should always think about what to do

langchain/src/agents/mrkl/prompt.ts

@@ -1,5 +1,5 @@
 export const PREFIX = `Answer the following questions as best you can. You have access to the following tools:`;
-export const FORMAT_INSTRUCTIONS = `Use the following format:
+export const FORMAT_INSTRUCTIONS = `Use the following format in your response:
 
 Question: the input question you must answer
 Thought: you should always think about what to do

langchain/src/agents/tests/mrkl_agent.int.test.ts

@@ -0,0 +1,62 @@
+/* eslint-disable no-process-env */
+import { ChatOpenAI } from "../../chat_models/openai.js";
+import { SerpAPI } from "../../tools/serpapi.js";
+import { Calculator } from "../../tools/calculator.js";
+import { initializeAgentExecutorWithOptions } from "../initialize.js";
+import { DynamicTool } from "../../tools/dynamic.js";
+
+test("Run agent locally with GPT-3.5", async () => {
+  const model = new ChatOpenAI({ temperature: 0, modelName: "gpt-3.5-turbo" });
+  const tools = [
+    new SerpAPI(undefined, {
+      location: "Austin,Texas,United States",
+      hl: "en",
+      gl: "us",
+    }),
+    new Calculator(),
+    new DynamicTool({
+      name: "foo",
+      description: "Some other tool that does foo",
+      func: async () => "bar",
+    }),
+  ];
+
+  const executor = await initializeAgentExecutorWithOptions(tools, model, {
+    agentType: "zero-shot-react-description",
+  });
+
+  const input = `What is the weather like in Washington DC?`;
+  console.log(`Executing with input "${input}"...`);
+
+  const result = await executor.call({ input });
+
+  console.log(`Got output ${result.output}`);
+});
+
+test("Run agent locally with GPT-4", async () => {
+  const model = new ChatOpenAI({ temperature: 0, modelName: "gpt-4" });
+  const tools = [
+    new SerpAPI(undefined, {
+      location: "Austin,Texas,United States",
+      hl: "en",
+      gl: "us",
+    }),
+    new Calculator(),
+    new DynamicTool({
+      name: "foo",
+      description: "Some other tool that does foo",
+      func: async () => "bar",
+    }),
+  ];
+
+  const executor = await initializeAgentExecutorWithOptions(tools, model, {
+    agentType: "zero-shot-react-description",
+  });
+
+  const input = `What is the weather like in Washington DC?`;
+  console.log(`Executing with input "${input}"...`);
+
+  const result = await executor.call({ input });
+
+  console.log(`Got output ${result.output}`);
+});

langchain/src/tools/webbrowser.ts

@@ -245,5 +245,5 @@ export class WebBrowser extends Tool {
 
   name = "web-browser";
 
-  description = `useful for when you need to find something on or summarize a webpage. input should be a comma seperated list of "ONE valid http URL including protocol","what you want to find on the page or empty string for a summary".`;
+  description = `useful for when you need to find something on or summarize a webpage. input should be a comma separated list of "ONE valid http URL including protocol","what you want to find on the page or empty string for a summary".`;
 }