# What is Claude Code? 2026 Comprehensive Turkish Guide: Setup, Hooks, MCP, Sub-Agents

> Source: https://sukruyusufkaya.com/en/blog/claude-code-nedir-turkce-rehber
> Updated: 2026-05-13T19:56:24.111Z
> Type: blog
> Category: yapay-zeka
**TLDR:** A zero-to-advanced Turkish guide for Anthropic's terminal-native agentic code assistant Claude Code: installation (npm/Homebrew), CLAUDE.md file, slash commands, MCP server integration (GitHub, Postgres, Linear), hooks (PreToolUse, PostToolUse, Stop), sub-agents, IDE integration (VS Code, JetBrains, Neovim), cost optimization, KVKK compliance. 15 practical commands + 8 use cases.

<tldr data-summary="[&#34;Claude Code is Anthropics terminal-native agentic AI coding assistant, released Feb 2025. Direct access to Claude Opus 4, Sonnet 4.6, Haiku 4.5.&#34;,&#34;No bundled IDE — runs alongside VS Code, JetBrains, Neovim, Cursor — fully IDE-agnostic.&#34;,&#34;Three core powers: (1) agent loop for multi-step task execution, (2) MCP for native integration with GitHub/DB/Linear/etc., (3) sub-agents via Task tool for parallel exploration.&#34;,&#34;Install in 60 seconds: npm install -g @anthropic-ai/claude-code, then claude login. Node 18+. Mac/Linux/Windows.&#34;,&#34;CLAUDE.md is the per-project instructions file. Tech stack, git policy, security rules, file layout go here.&#34;,&#34;Hooks (PreToolUse, PostToolUse, Stop) define custom workflows: pre-commit tests, KVKK regex enforcement, etc.&#34;,&#34;Cost: Claude Pro ($20/mo) for typical use. Heavy: Claude Max ($100-200/mo) or direct Anthropic API ($3/$15 Sonnet, $15/$75 Opus per 1M tokens).&#34;]" data-one-line="Claude Code is the terminal-native agentic AI coding assistant — IDE-agnostic, MCP-integrated, sub-agent-capable, and the strongest Turkish-fluent paid option for Turkish developers."></tldr>

## 1. What is Claude Code?

Anthropic's terminal/CLI agentic AI coding assistant launched Feb 2025. Direct access to Claude models with MCP, sub-agents, hooks, and IDE-agnostic architecture.

## 2. Installation

<code>npm install -g @anthropic-ai/claude-code</code> then <code>claude login</code>. Requires Node 18+, supports macOS/Linux/Windows.

## 3. CLAUDE.md

A project-root markdown file that Claude Code reads every session. Contains tech stack, git policy, security rules, file layout, conventions. Hierarchy: global (~/.claude/CLAUDE.md), project (./CLAUDE.md), local (./CLAUDE.local.md).

## 4. Slash Commands

Built-in: /init, /clear, /compact, /mcp, /hooks, /cost, /model, /permissions, /agents. Custom slash commands defined in ~/.claude/commands/*.md.

## 5. MCP — Model Context Protocol

Anthropic's open protocol for connecting LLMs to external tools. Popular servers: github, postgres, linear, notion, sentry, slack. Configure in ~/.claude/mcp.json.

## 6. Hooks

PreToolUse, PostToolUse, UserPromptSubmit, Stop, Notification, SubagentStop. Define in settings.json. Harness-enforced (not Claude-enforced) — safe to rely on for security.

## 7. Sub-Agents

Task tool delegates work to sub-agents. Built-in: general-purpose, code-reviewer, Plan, Explore. Custom in ~/.claude/agents/*.md.

## 8. Use Cases

- Repo onboarding
- Migration (Express → Next.js)
- Test coverage improvement
- Production bug fix (with Sentry MCP)
- KVKK audit (custom sub-agent)
- Schema migration (with Postgres MCP)
- Multi-service refactor
- i18n completion

## 9. KVKK Compliance

For sensitive code/IP, use Claude Team or Enterprise. Anthropic EU region (Frankfurt) for data residency. Hooks can enforce TC kimlik no / IBAN / credit card regex blocking.

## 10. Conclusion

Claude Code is the gold standard for agentic coding. CLAUDE.md + hooks + sub-agents combination automates 40-60% of senior engineer tasks. Strong Turkish fluency + KVKK alignment make it a top choice for Turkish developers.