MCP, Hooks, and Tools
Claude Code provides a layered extensibility architecture encompassing external integrations, automation hooks, reusable commands, autonomous agents, and multi-platform deployment. This lesson surveys the primary extension points and their intended use cases.
MCP (Model Context Protocol)
MCP enables Claude Code to interface with external services such as Slack, GitHub, Google Drive, and databases through a standardized protocol.
- Query databases and APIs without manual data transfer
- Read and write to external services within the conversation
- Community-maintained and custom MCP servers are both supported
As a diagnostic heuristic: any workflow involving repeated copy-paste from an external source is a candidate for MCP integration.
Hooks
Hooks execute shell commands automatically in response to Claude Code events,
configured in settings.json.
- Format code (Prettier, Black) on every file write
- Run type-checking after edits
- Execute linting before commits
- Validate changes against project-specific rules
Hooks enforce quality constraints without relying on manual verification.
Custom Slash Commands and Skills
Reusable prompt templates can be created as markdown files in the
.claude/commands/ directory. Each file is exposed as a
slash command (e.g., /debug, /review, /deploy).
Skills extend this concept with parameterized, composable prompt packages.
Agents and Triggers
Claude Code can delegate subtasks to specialized subagents that operate in isolated contexts. Triggers enable scheduled execution of agents on a cron schedule, suitable for recurring tasks such as automated audits or periodic code analysis.
Platform Availability
Claude Code is available across multiple environments: the terminal CLI, a desktop application (macOS and Windows), a web interface (claude.ai/code), and IDE extensions for VS Code and JetBrains. Feature parity across platforms allows teams to adopt the interface that best fits their workflow.
Model capabilities evolve continuously. Features that produced suboptimal results in prior model generations may perform significantly better with the Claude 4 family. Periodic re-evaluation of previously dismissed capabilities is recommended.
Key Takeaways
- MCP provides standardized access to external services and data sources
- Hooks automate quality enforcement at the tool level
- Custom commands and skills package reusable prompt workflows
- Subagents and triggers enable delegation and scheduled automation
- Claude Code operates across CLI, desktop, web, and IDE environments