Claude Code

## What It Does

Claude Code runs in a terminal (or as an SDK/IDE integration) and works like a pair programmer with direct access to a project's files and shell. It can read a codebase, plan and make multi-file edits, run tests and linters, fix failures it finds, and execute git operations — all while asking for permission before risky actions.

## Key Features

- **Agentic workflow**: Plans a task, edits multiple files, runs the test suite, and iterates on failures without needing every step spelled out. - **Shell and tool access**: Can run arbitrary terminal commands (with permission prompts) to build, test, and inspect a project. - **Large context**: Built on Claude's large context window, so it can hold an entire codebase's relevant context during a task. - **Extensibility**: Supports custom subagents, skills, and MCP (Model Context Protocol) connections to external tools and data sources. - **IDE and CI integration**: Available as a CLI, VS Code/JetBrains extension, and headless mode for CI pipelines and automation.

## Who It's For

Software engineers who want an AI agent that can autonomously execute coding tasks — refactors, bug fixes, test-writing, migrations — rather than just suggest inline completions.

## Practical Tips

- Give it a CLAUDE.md file with project conventions to reduce back-and-forth. - Use plan mode for larger changes before letting it edit files directly.

## Limitations

Requires a Claude subscription or API credits — there's no fully free standalone tier. Best results come from clear task scoping; very open-ended prompts can lead to overbroad changes.