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// CLAUDE CODE

Claude Code is a
context machine.

Claude Code is Anthropic's agentic coding tool. It runs in your terminal, reads and writes files, executes shell commands, and iterates on code autonomously. It's built for engineers who want an AI that works inside their existing workflow—not a new IDE. Use it when you need multi-file refactors, automated testing loops, or codebase-wide changes that require real tool access.

Guides & Resources

Guide

The Complete CLAUDE.md Guide

How to write context files that survive real projects. Structure, content, and iteration patterns.

Guide

Claude Code Hooks

Automate quality checks, trigger tests, and extend Claude Code with shell scripts.

Comparison

Claude Code vs Cursor

An honest comparison: different philosophies, different strengths. How to choose.

Lab

Build Your Own Agent

Mini Claude Code: a working coding agent in ~500 lines. Six episodes, full source.

Deep Dive

Context Engineering

A practitioner's synthesis of frontier research on context management for coding agents.

Research

Coding Agents vs Long Context

Why agents outperform long-context systems: the Duke paper breakdown.

Guide

Plan Mode

Research first, edit after approval. When the extra review step is worth it.

Guide

First Week Guide

Install to first useful session in seven days — without drowning in docs.

01

Context is the product

Your CLAUDE.md should describe the commands, architecture, boundaries, and proof required to finish work. Keep it short enough to stay true.

CLAUDE.md
## Commands
npm run typecheck
npm run test

## Boundaries
- Preserve public APIs
- Never edit generated files

## Definition of done
- Types pass
- Critical path verified
02

The plan → build → verify loop

Start by mapping what exists. Make the smallest coherent plan. Build within explicit boundaries. Then verify the behavior, not merely the diff.

MAP→PLAN→BUILD→VERIFY
03

Leave a clean handoff

A useful completion note says what changed, what was verified, and what remains uncertain. It should help the next person move without replaying the entire session.

Stay close to the tool.

Join the first readers of the Claude Code field manual.

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