Harness Engineering 6 months ahead, in a few hours.

Module 06 — MCP (Model Context Protocol)

In this module

You'll learn how to connect Claude Code to external tools (databases, Jira, Linear, GitHub) via the MCP protocol, install and configure MCP servers, handle authentication, and set up governance for your team.

6.1 — What is MCP? The universal AI-to-tools protocol

Until now, every AI tool had to build its own integrations with every external service. One AI client, ten tools: ten specific integrations, each with its own format, authentication, and limitations. Three AI clients, ten tools: thirty integrations. MCP -- Model Context Protocol -- eliminates this complexity.

MCP is an open, standardized protocol that defines how an AI assistant communicates with external tools. Think USB-C: a single universal connector. Each tool is implemented once as an MCP server, and every compatible AI client understands it natively. You go from N x M integrations to N + M.

The architecture is built on a client-server model. Claude Code acts as the **MCP clien

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