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Claude Code - Anthropic's AI Coding Assistant | Klero Resources

A practical guide to Claude Code: setup, context, MCP, and when to use it for explanation, refactors, and tests.

Claude code

Claude Code is Anthropic’s AI assistant for coding. It runs inside your IDE (e.g. VS Code via an extension or Cursor) and can read the codebase, explain code, draft changes, and run commands in a sandbox. This guide covers what Claude Code does well and how to use it effectively.

Introducing Claude Code

Why claude code fits product work

  • Long context - Large context windows so it can see many files at once. Good for “understand this repo” or “refactor this module.”
  • Sandboxed execution - It can run terminal commands in a controlled environment. You see the plan and approve; it doesn’t change your machine arbitrarily.
  • MCP support - Model Context Protocol integrations (browsers, APIs, databases) so Claude can use tools. Extends what it can do beyond the editor.
  • Explain and edit - “What does this do?” and “change it to do X” in one flow. Useful for legacy code and onboarding.
  • Tests and fixes - It can suggest tests, run them, and propose fixes when they fail. Use it to add coverage or debug test failures.

    • Core concepts that matter

    Setup and connection

    Claude Code usually runs as an IDE extension or inside a host like Cursor. You sign in with an Anthropic account; usage goes against your plan. Follow the official setup for your editor.

    Context and scope

    Point Claude at files, folders, or the whole repo. The more you give it, the better it can reason - but responses get slower and noisier if the scope is huge. Start with the relevant directory or files; expand when you need cross-cutting changes.

    Mcp (model context protocol)

    MCP servers add capabilities: browse the web, call APIs, query a DB, read docs. Configure the ones you need; Claude can then use them when solving a task. Use MCP when the answer depends on live data or external tools.

    Subagents and workflows

    Some setups let you define subagents or multi-step workflows (e.g. “plan → implement → test”). Use them for larger, structured tasks instead of one big “do everything” prompt.

    Sandbox and security

    Claude runs commands in a sandbox. It can’t access your full filesystem or network unless you configure it. Review proposed commands before approval; treat it like a pair programmer that suggests, not executes by default.

    Practical habits

  • Give it a clear task - “Add a function that does X, using the pattern in utils/validation” beats “improve this file.”
  • Use MCP for “live” tasks - Need to check an API or docs? Attach the right MCP server so Claude can look it up instead of guessing.
  • Iterate in small steps - One “explain this,” then one “add tests,” then one “refactor.” Easier to verify and correct.
  • Review commands - Before approving terminal commands, scan for anything that modifies data or deploys. Default to “run in sandbox” when possible.
  • Keep a project brief - A short “this repo does X, we use Y, avoid Z” in a doc or prompt helps Claude match your conventions.

    • When claude code isn’t the fit

  • Strict data rules - If code or logs can’t leave your environment, confirm whether Claude Code sends data to Anthropic. Use fully local or approved tools if required.
  • You already use Cursor/Windsurf - Those editors have their own AI and context. Claude Code is most valuable as the model/UX you prefer inside an editor or as a separate “explain this codebase” tool.
  • Tiny one-off scripts - For a few lines, a browser or CLI might be simpler. Claude Code shines on real projects and multi-file work.

    • Pricing (high level)

    Usage is typically via Anthropic pricing (tokens, subscription, or bundled in an IDE plan). Check Anthropic and your IDE’s offering for current details.

    Claude Code Tutorial for Beginners

    Claude Code is a strong option when you want an AI that can read your codebase, explain it, and suggest edits with sandboxed execution. Use clear prompts, scope context, and add MCP when you need external tools.

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