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MCP in Claude Code

MCP connects Claude Code to external tools and data sources like Linear, GitHub, and documentation servers. This video covers adding servers, scoping them for your team, and managing context costs. Take the full course: claude.com/courses

May 8, 20263mWatch on YouTube ↗

At a glance

WHAT IT’S REALLY ABOUT

MCP connects Claude Code to tools while managing context limits

  1. MCP is an open standard that lets Claude Code connect to external tools and data sources for better, context-aware answers and actions.
  2. Tools enable agentic workflows where Claude can take actions (via integrations) rather than only returning text outputs.
  3. Claude Code supports adding MCP servers for common services (e.g., Linear, documentation sources) and browsing many connectors via claude.com/connectors.
  4. MCP servers can be remote (HTTP) or local (STDIO), and can be scoped locally, per-user, or shared via a versioned .mcp.json file.
  5. Because MCP tool definitions consume context even when unused, users should prune/disable servers, consider CLI alternatives, and understand tool search mode behavior.

IDEAS WORTH REMEMBERING

5 ideas

MCP’s main value is bringing “elsewhere” context into Claude Code.

Many critical details live in databases, productivity apps, or public repos; MCP lets Claude access these sources when it determines they’re needed.

MCP tools enable action-oriented agent behavior, not just responses.

By defining tools, Claude Code can perform operations (e.g., retrieving Linear issue details or dependency docs) to complete tasks more effectively.

Choose the right MCP server type based on where the integration runs.

Use HTTP servers for hosted remote services over the network, and STDIO servers for local processes running on your machine.

Project-scoped MCP improves team consistency and onboarding.

Checking a .mcp.json file into version control ensures everyone on the codebase automatically gets the same MCP servers and setup.

Too many MCP servers can silently consume your context budget.

Tool definitions are added to the context window even when you’re not using them, so excessive servers reduce available space for actual task context.

WORDS WORTH SAVING

5 quotes

Model Contact Protocol is an open standard that lets Claude Code connect to external tools and data sources.

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Context is one of the most important parts when working with Claude Code.

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Tools give agents like Claude Code the ability to perform actions in order for them to better complete their tasks.

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MCP servers add tool definitions to your context window, even when you're not using them.

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If your MCP tools exceed ten percent of your context window, Claude Code will automatically switch to tool search mode, which will discover the right tools on demand, but this might not work as well since it's just not in the context.

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Model Context Protocol (MCP) purposeAgentic AI tools vs plain text outputsAdding MCP servers (claude mcp add)HTTP vs STDIO server typesServer management with /mcpScoping: local, user, project via .mcp.jsonContext window overhead and tool search mode

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