In Lang Chain course there is no topic of MCP server. MCP is widely used in Lang chain to create agents. Am I missing something here? Do we need MCP server for agent or agents can work without MCP server and can perform good. I am working on mssql data agent and all the doc show [MCP server](https://github.com/JexinSam/mssql_mcp_server/tree/main/src/mssql_mcp_server).
Any advice will be helpful and if we have any course about MCP please shear the name or link.
Regards,