Update 02-mcp.md

Author: BohuTANG

docs/en/guides/51-ai-functions/02-mcp.md

@@ -52,10 +52,6 @@ pip install packaging openai agno openrouter sqlalchemy fastapi mcp-databend
 Now create your ChatBI agent that uses mcp-databend to interact with your database.
 
 Create a file `agent.py`:
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-<summary>Click to view agent.py code</summary>
 
 ```python
 from contextlib import asynccontextmanager
@@ -170,8 +166,6 @@ if __name__ == "__main__":
     playground.serve(app="agent:app", host="127.0.0.1", port=7777)
 ```
 
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 ### Step 4: Configure Environment
 
 Set up your API keys and database connection: