Understanding MCP Client and MCP Server

Introduction

The Model Context Protocol (MCP) employs a client-server architecture, making it an essential framework for bridging applications with external systems using standardized mechanisms. In this blog, we will delve into the distinctions between MCP Clients and MCP Servers, their roles, and practical use cases.

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What is MCP?

MCP, short for Model Context Protocol, enables applications to interact with external systems like APIs, databases, or local files. This setup follows a client-server model where the client manages front-end interactions, and the server handles backend functionalities.

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MCP Client

Role

• Embedded within host applications (IDEs, chatbots, etc.) to manage connections and user interactions.

Functions

• Connects to a single MCP Server (1:1).

• Handles capability negotiation, request forwarding, and response processing.

• Manages message transport (Stdio, SSE, HTTP).

Examples

• VS Code.

• Cursor IDE.

• Claude Code.

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MCP Server

Role

• Acts as a bridge/API to external systems like databases, APIs, or local files.

Functions

• Exposes tools, resources, and prompts via MCP-compliant APIs.

• Executes client requests (e.g., accessing files, making API calls).

• Built in languages such as Python, TypeScript, or Rust.

Examples

• Prebuilt servers for calculators, file management, or app integrations.

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Key Differences

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Practical Implementation

How Does It Work?

Let’s consider VS Code acting as an MCP Client, connecting to an external MCP Server. A user interacts with VS Code, and their actions (such as opening files or making API calls) are forwarded to the server. The server then processes these requests and sends appropriate responses back to the client.

Communication Methods

MCP uses various transport-layer mechanisms:

• Stdio (local communication)

• HTTP with Server-Sent Events (SSE) for seamless remote interactions.

Learn more about MC Protocol here.

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Conclusion

The MCP framework streamlines application interactions with external systems by defining clear roles for clients and servers. MCP Clients manage interactions and connections, while MCP Servers process backend requests.

Try exploring your IDE’s compatibility with MCP Servers to enhance your workflows.

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Tags

mcp, client-server, model context protocol, blog