# Claude Code - the complete guide and library > What Claude Code is, how to get started, and a library of thousands of agents, skills, commands and MCP connectors. For developers and beginners. - Source: https://doutorai.pt/en/claude-code - Site: Doutor AI (https://doutorai.pt/en) - AI tools for small businesses Claude Code is the Anthropic tool that puts the Claude model to work coding with you in the terminal: it reads your code, makes changes, runs commands and automates tasks - you say what you want in plain English and it does it. This is the largest Portuguese library of Claude Code resources - specialized agents, skills, commands and MCP connectors, organized by category - plus a guide for anyone getting started. Whether you are an experienced developer or just taking your first steps, this is where you learn to get the most out of Claude Code. ## Browse by category - [Agents](https://doutorai.pt/en/claude-code/agents): Find specialized AI agents for Claude Code in the Doutor AI Library. Optimize your projects with high-quality components. - [Skills](https://doutorai.pt/en/claude-code/skills): Find essential skills for Claude Code in the Doutor AI Library. Improve what your application can do with our components. - [Commands](https://doutorai.pt/en/claude-code/commands): Find slash commands for Claude Code in the Doutor AI Library. Learn how to install and use them to optimize your development. - [Connectors](https://doutorai.pt/en/claude-code/mcps): Find MCP connectors for Claude Code in the Doutor AI library. Easily connect external tools to your project. - [Automations](https://doutorai.pt/en/claude-code/hooks): Find event automations (hooks) for Claude Code in the Doutor AI Library. Make your applications more efficient. - [Settings](https://doutorai.pt/en/claude-code/settings): Explore essential settings for Claude Code in the Doutor AI Library and optimize your projects with efficient configurations. - [Loops](https://doutorai.pt/en/claude-code/loops): Repeatable workflows and automation cycles for Claude Code. - [Sandbox](https://doutorai.pt/en/claude-code/sandbox): Isolated environments and safe experiments for testing with AI. - [Templates](https://doutorai.pt/en/claude-code/templates): Ready-to-use starter projects to get going in no time. - [Prompts](https://doutorai.pt/en/claude-code/prompts): Components for Claude Code. ## What is Claude Code? Claude Code is a command-line tool (CLI) built by Anthropic that brings the Claude AI model straight into your development environment. Instead of copying and pasting code from a chat, Claude Code works inside your project: it reads the files, proposes and applies changes, runs tests and commands, and automates repetitive tasks - all from instructions in plain language. ## Who is Claude Code for? For developers who want to speed up their work with an AI pair inside the terminal - and for beginners too. Because you talk to it in plain language ("build me a page", "fix this error"), Claude Code lowers the barrier to entry a lot. ## How to get started (in 3 steps) **1.** Install Claude Code (through npm or the official installer). **2.** Sign in with your Claude account. **3.** Open the terminal in your project and type what you want to do. From there, come back to this library for the agents and skills that power up your workflow. ## What you will find in this library **Agents** - specialized sub-assistants (code review, testing, security…). **Skills** - reusable capabilities that teach Claude Code new tricks. **Commands** - shortcuts for frequent tasks. **MCP** - connectors that link Claude Code to external tools and data. All free to explore, by category. ## By use case, not by category Categories are for exploring. When you already know the task you want to solve, it is faster to start from a hand-picked selection: we chose the components that actually do the job and explain why. [Code review](https://doutorai.pt/en/for/code-review) · [Automated testing](https://doutorai.pt/en/for/automated-testing) · [Security and auditing](https://doutorai.pt/en/for/security-audit) · [Databases](https://doutorai.pt/en/for/databases) · [Technical documentation](https://doutorai.pt/en/for/technical-documentation) · [Frontend and interfaces](https://doutorai.pt/en/for/frontend-and-ui) · [DevOps and deployment](https://doutorai.pt/en/for/devops-and-deployment) · [Debugging](https://doutorai.pt/en/for/debugging). [See all use cases](https://doutorai.pt/en/for). ## Frequently asked questions ### What is Claude Code? It is a command-line tool from Anthropic that puts the Claude model to work inside your project: it reads the code, makes changes, runs commands and automates tasks, based on instructions in plain language. ### Is Claude Code free? The software is free to install. To use it you need a Claude subscription (Pro or Max) or Anthropic API credits. The resources in this library (agents, skills, commands) are free to explore. ### How do I install Claude Code? Usually through npm (npm install -g @anthropic-ai/claude-code) or the official installer, and then you sign in with your Claude account. Our how-to guides include a learning roadmap for beginners. ### Do I need to know how to code to use Claude Code? It helps, but it is not required. Because you explain what you want in plain language, Claude Code is also accessible to beginners. ### What are agents, skills, commands and MCP? Agents are specialized sub-assistants; skills are reusable capabilities; commands are shortcuts for frequent tasks; and MCP (Model Context Protocol) connects Claude Code to external tools and data such as databases and APIs. ### How much does Claude Code cost? The cost comes from the Claude subscription or the Anthropic API usage you choose: Claude Code itself has no separate fee. For current plan details, see Anthropic's pricing. ## Save hours every week with AI, no hassle **Doutor AI** gives you 1,859 ready-to-copy AI prompts, by industry and in plain English - plus a complete technical library for those who want to go further. [See plans →](https://doutorai.pt/en/pricing) --- Content by Doutor AI (https://doutorai.pt/en). When quoting, please cite the source: https://doutorai.pt/en/claude-code