What is Claude Code?
Claude Code is Anthropic's agentic coding tool. It reads your entire codebase, edits files, runs commands, and connects to your dev tools—all from plain-English requests. It runs in the terminal, VS Code and JetBrains IDEs, a desktop app, and the web. It's included in paid Claude plans (Pro from $20/month) or via metered API access.
Why — the first-principles explanation
Most AI coding helpers are autocomplete: they guess the next line as you type. Claude Code is agentic, which is a bigger idea. You give it a goal in plain English, and it runs a loop—read files, make a plan, edit code, run commands, check the result, and repeat—until the task is actually done. It acts less like a spell-checker and more like a junior developer who can take a ticket and work it.
This works because a large language model can hold a lot of context and use tools. Claude Code gives the model tools to read and write files, run your shell, search the web, and call external systems through MCP (Model Context Protocol)—an open standard for plugging AI into things like Jira, Google Drive, or your own scripts. Because the model can both reason and act, it can trace a bug across many files or wire up a feature end to end.
The same engine runs on every surface—terminal, IDE extension, desktop app, and web browser—so your project rules (a CLAUDE.md file), settings, and connected tools follow you everywhere. That's the core of what Claude Code is: one AI developer you can reach from wherever you work, that understands your whole project rather than one file at a time.
An example that makes it click
Think of the difference between a spell-checker and a capable assistant. A spell-checker fixes one word as you type. An assistant, instead, takes the instruction 'draft the quarterly report, pull the numbers from the shared drive, and email me a summary,' then does all the steps and comes back with the finished thing. Claude Code is the assistant version for code: you say 'find and fix the login bug,' and it hunts through your files, writes the fix, runs the tests, and shows you the result.
Key facts
- Claude Code is an agentic coding tool from Anthropic that reads code, edits files, and runs commands.
- It works from plain-English requests and can connect to external tools via MCP (Model Context Protocol).
- It runs in the terminal, VS Code, JetBrains IDEs, a desktop app, and the web at claude.ai/code.
- It's included in paid Claude plans (Pro from $20/month, Max, Team, Enterprise) or usable via metered API access.
- A CLAUDE.md file, settings, and MCP servers carry across every surface because they share one engine.
Anthropic's agentic coding tool that works in your terminal.
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What is Claude Code? It's Anthropic's agentic coding tool—and 'agentic' is the key word. Older AI helpers just autocomplete the next line. Claude Code takes a goal you describe in plain English and works the whole task: it reads your entire codebase, plans an approach, edits files, runs commands, checks its own results, and repeats until the job is done. It behaves less like a spell-checker and more like a junior developer you can hand a ticket. It can also plug into your other tools—Jira, Google Drive, your own scripts—through an open standard called MCP. And it runs everywhere: your terminal, VS Code and JetBrains, a desktop app, and the web. Because they all share one engine, your project rules and settings follow you across every surface. It's included in paid Claude plans starting at twenty dollars a month, or you can pay per token through the API. In short: one AI developer that understands your whole project, wherever you work.
What authoritative sources say
People also ask
How is Claude Code different from GitHub Copilot?
Copilot focuses on inline autocomplete. Claude Code is agentic—it plans, edits across many files, runs commands, and verifies its own work.
Where does Claude Code run?
In the terminal, VS Code and JetBrains IDEs, a desktop app, and the web at claude.ai/code. All surfaces share one engine.
What is MCP in Claude Code?
MCP (Model Context Protocol) is an open standard that lets Claude Code connect to external tools and data like Jira, Slack, or Google Drive.
Do I need a subscription to use it?
You need either a paid Claude plan (Pro from $20/month) or a metered Anthropic API/Console account.