A Model Context Protocol (MCP) client is a software application, library, or agent component that implements the client side of the Model Context Protocol — enabling it to discover, connect to, and interact with MCP servers in a standardized way.

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An MCP client:

• Initiates connections to MCP servers to request capabilities, tools, or data sources.
• Exchanges structured messages (e.g., via JSON-RPC over secure channels) to send commands and receive responses.
• Maintains context for the interaction, allowing agents or LLMs to use retrieved data or tools effectively.
• Enforces security requirements such as authentication, authorization, and scope-limited permissions as defined by the MCP specification.

Example:

A local AI agent running an MCP client can connect to multiple MCP servers — one providing company HR data, another exposing SaaS app management tools — and seamlessly use both within a single conversational or task-execution flow.

Related terms:

• Model Context Protocol (MCP) – The underlying standard defining communication between MCP clients and servers.
• MCP Server – The system or service that hosts tools or data sources accessible through MCP.