Claude Code is an AI coding agent built by Anthropic that runs in your terminal. Here's what it is, how it works, and why it is different from every other AI coding tool.
Claude Code is an AI coding agent that runs in your terminal. It is built by Anthropic — the company that makes Claude — and it operates differently from every other AI coding tool on the market.
Most AI coding tools live in your IDE and suggest code as you type. Claude Code does not work that way. You give it a task in the terminal, and it reads your project, plans the work, and executes it: writing files, running commands, fixing errors, and iterating until the task is done.
Claude Code is a CLI — a command-line interface. You install it via npm (npm install -g @anthropic-ai/claude-code), navigate to a project directory, and type claude to start a session.
From there, you give it instructions in plain language: "Add input validation to the signup form and write tests for each validation rule." Claude Code reads the relevant files, understands the project structure, plans what needs to happen, and executes it — across as many files as the task requires, running tests or build commands if needed, and correcting errors it encounters.
It is agentic. It does the work, not just the talking.
It has access to your actual files. Claude Code reads and writes your real project files. Not a snippet you pasted into a chat — your full codebase, in the directory you ran it from.
It can run commands. Claude Code has shell access. It can install packages, run your test suite, execute build commands, and use the output of those commands to inform the next step.
It reasons across your whole project. Claude Code understands how parts of your codebase connect — imports, dependencies, shared types, shared logic. When you ask it to change something, it makes the change everywhere it needs to be made.
It iterates autonomously. If something breaks, Claude Code reads the error, identifies the cause, and fixes it. This loop — which humans do manually — runs automatically.
Building features. Give Claude Code a feature specification and it scaffolds the implementation — routes, handlers, models, tests — across all the files that need to change.
Refactoring. Large refactors that touch many files (renaming a module, migrating to a new library, updating a data model) are tasks Claude Code handles in minutes.
Writing tests. Test suites for existing code are time-consuming to write manually. Claude Code reads your functions and generates comprehensive tests.
Debugging. Give it an error or a failing test and it finds the root cause and fixes it.
Documentation. Reading a codebase and producing accurate documentation is a task Claude Code does well.
Claude Code is primarily used by:
It is not well suited to non-developers. Running it requires terminal comfort, and understanding its output requires enough technical literacy to review code changes before accepting them.
| | Claude Code | GitHub Copilot | Cursor | |---|---|---|---| | Type | Terminal agent | IDE assistant | IDE with AI | | Inline completions | No | Yes | Yes | | Autonomous tasks | Yes | Limited | Limited | | Shell access | Yes | No | Limited | | Requires terminal | Yes | No | No |
Claude Code is not a replacement for IDE-based tools — it is a different kind of tool for a different kind of work. Many developers use Cursor or Copilot for day-to-day coding and Claude Code for larger autonomous tasks.
WhatWill AI builds AI systems and automation for Australian businesses using Claude Code. Book a discovery call to find out what we can build for you.
Claude Code is an AI coding agent developed by Anthropic that runs as a command-line tool in your terminal. Unlike IDE-based AI coding tools, Claude Code operates autonomously on your codebase — reading files, writing code, running shell commands, and completing multi-step tasks without you directing each action. It is available to Claude Pro and Max subscribers.
Claude.ai and ChatGPT are AI chat interfaces where you have conversations. Claude Code is an agent with direct access to your filesystem and terminal. It can read your actual project files, make changes to them, run commands, and iterate — not just suggest what you should do. It acts in your codebase; chat tools only talk about it.
Claude Code is available to Claude Pro subscribers ($20/month) and Claude Max subscribers. There is a free tier with limited usage. Access is via Anthropic's website and the Claude Code CLI, which is installed via npm.
Claude Code works with all major programming languages — Python, JavaScript, TypeScript, Go, Rust, Ruby, Java, C#, PHP, and more. It also handles configuration files, shell scripts, SQL, and other text-based formats. Its capability is not language-dependent; it reads and writes any text-based file.
Claude Code operates in your current working directory and can modify files and run commands. It asks for confirmation before potentially destructive actions. Use it in a branch, keep your work in version control, and review changes before merging. These are standard practices that make it safe to use.
WhatWill AI builds and runs AI systems for Australian businesses. Book a free 30-minute discovery call — we’ll tell you exactly what’s worth building for your situation.