How to Extend Claude Code with MCP, Subagents, and Hooks for Production Use

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Claude Code supports external integrations through Model Context Protocol (MCP), which allows it to connect with tools and services like GitHub, Sentry, and Notion via local or hosted MCP servers. Users can add MCP servers using the 'claude mcp add' command, with options to scope access privately, across all personal projects, or shared team-wide through a repository file. Subagents enable Claude Code to delegate tasks to isolated instances with their own context, preventing the main session from being cluttered with reusable or repetitive outputs. Slash commands allow users to package frequently used prompts into reusable shortcuts, while Hooks provide deterministic guardrails that enforce rules without relying on the AI's in-session memory. Together, these four features are designed to make Claude Code a more reliable and extensible tool for production workflows.

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