Claude Code is Anthropic's agentic coding tool. Developers hand it a bug fix, test or multi-day migration, and it plans the work, asks clarifying questions, reads and edits files, runs commands and reports back for review.

Key features:

Explain an unfamiliar codebase, triage issues and migrate code.
Run long tasks for hours or days, with an auto mode designed to catch risky commands.
Group related sessions into Projects to supervise several agents at once.
Review pull requests with Code Review before changes reach production.
Steer work from the terminal, VS Code, JetBrains, Slack, GitHub, the web or mobile.
Run sessions on your own infrastructure with self-hosted environments (beta).

Claude Code installs with a one-line script on macOS, Linux and Windows. It is included in the Pro plan ($20/month, or $17/month billed annually) and Max plans from $100/month; Team seats are $20 per month billed annually, and Enterprise adds spend limits, role-based access and audit controls. It can also be used through the API or cloud providers.