Tools in Claude Code:

Name	Purpose
Agent	Launch a subagent to handle a task
Bash	Run a shell command
Edit	Edit a file
Glob	Find files based upon a pattern
Grep	Search the contents of a file
LS	List files and directories
MultiEdit	Make several edits at the same time
NotebookEdit	Write to a cell in a Jupyter notebook
NotebookRead	Read a cell
Read	Read a file
TodoRead	Read one of the created to-do’s
TodoWrite	Update the list of to-do’s
WebFetch	Fetch from a URL
WebSearch	Search the web
Write	Write to a file

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Claude Code Basic workflow:

• Explore
• Plan
• Code
• Commit

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Skills vs MCP vs Plugins vs Sub-Agents vs Hooks

	Skills	MCP	Plugins	Sub-Agents	Hooks
What it is	Markdown instruction file	Protocol connecting Claude to external services	Bundled package of Skills, MCP, and commands	Spawned AI worker instance	Event-triggered scripts that fire at specific lifecycle points
One-line role	Teaches Claude how to work	Gives Claude access to external tools	Ready-made toolkit combining multiple components	An independent AI co-worker	Intercepts and acts at defined moments in Claude’s workflow
Analogy	Recipe card	Kitchen plumbing	Full stocked kitchen	A hired specialist	A motion sensor that triggers an action
Thinks independently	No	No	No	Yes	No
Works in parallel	No	No	No	Yes	No
Triggered by	Task relevance	Tool call from Claude	Task relevance	Claude orchestrator	Lifecycle events (before/after tool use, before response, etc.)
Setup effort	Low	Medium	Low	Low	Medium
Works offline	Yes	No	Depends	Depends	Yes
Built by	You or community	Anthropic, providers, community	Anthropic or third parties	Claude automatically	You
Best for	Repeatable workflows, style guides	GitHub, Slack, databases, live APIs	Pre-built domain toolkits	Large parallel tasks	Logging, validation, guardrails, automation triggers

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The four kind of skills:

• Instructions: What to do, when to do, and how to do
• Assets: The raw materials to use
• References: Examples
• Scripts:

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