AI agents are getting more capable. But being capable is only part of the story. The real shift happens when agents go from simply responding to actually doing. They can update calendars. They can send emails. They can create GitHub issues and more. All of it triggered by a single prompt. In this guide, we’ll use the LangChain MCP adapter together with Composio’s managed MCP server. This setup brings these agents to life using something called Model Context Protocol, or MCP. You’ll learn how to build these agents step by step. You’ll also see how to plug in external tools using just a URL and run powerful actions with natural language. Let’s goooo!

AI agents are getting more capable. But being capable is only part of the story.
The real shift happens when agents go from simply responding to actually doing. They can update calendars. They can send emails. They can create GitHub issues and more. All of it triggered by a single prompt.
In this guide, we’ll use the LangChain MCP adapter together with Composio’s managed MCP server. This setup brings these agents to life using something called Model Context Protocol, or MCP.
You’ll learn how to build these agents step by step. You’ll also see how to plug in external tools using just a URL and run powerful actions with natural language.
Let’s goooo!