When we ran this code agent is not showing browser opened real step execution. Why agent fails?

[bibinkunjumon2020]

import asyncio
import os
import time
from dotenv import load_dotenv
from langchain_openai import ChatOpenAI
from pydantic import BaseModel,Field
from mcp_use import MCPAgent, MCPClient

class StepResult(BaseModel):
js_code: str = Field(description="JavaScript code for the step for playwright test automation, the step should be based on accurate reliable selector and should be after sucessful action")
natural_language: str = Field(description="Natural language description of the step")
run_status: str = Field(description="step completion status. 'Passed' if the agent is able to take the step and get the code else 'Failed'")

async def main():
# Load environment variables
load_dotenv()

# Create MCPClient from config file
client = MCPClient.from_config_file(
    os.path.join(os.path.dirname(__file__), "browser_mcp.json")
)

# Create LLM
llm = ChatOpenAI(model="gpt-4.1-mini")

# Create agent with the client
agent = MCPAgent(llm=llm, client=client, max_steps=30)

# Define queries as a step-by-step list
queries = [
'Visit "https://www.salesforce.com/in/data/" in browser and wait for page to fully load',
'Hover over the Globe icon in the top-right corner of the page and verify that Region options menu is displayed',
'In the Region options menu, click on "Canada (English)" and verify that browser navigates to a new page',
'Verify that the URL has changed to "https://www.salesforce.com/ca/" to confirm region change to Canada',

]

# Run each query in sequence
for i, query in enumerate(queries, start=1):
    print(f"\n➡️ Step {i}: {query}")
    result = await agent.run(query,output_schema=StepResult)
    print(f"✅ Result {i}: {result}")

print("🔹 Sleeping for 10 seconds before exit...")
time.sleep(10)

if name == "main":
asyncio.run(main())