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How to explain complex code in an unfamiliar project with Claude Code

Ask Claude Code in your terminal to explain how a part of an unfamiliar codebase works.

Remote script. The recommended macOS and Linux install pipes a script from claude.ai directly into bash, so review it first if your policy requires that.

Who it is forA developer who has just joined a team and must understand a large existing project before changing it.

The problemReading unfamiliar code file by file is slow, and the parts that matter are often spread across many files.

The outcomeA plain-language explanation of the chosen module, its main flow, and the files involved, so the developer can start work sooner.

What you need first

  • A terminal on macOS, Linux, or Windows
  • A local project directory you want Claude Code to work in
  • Permission to run one of the install methods listed in the README

Steps

  1. Install Claude Code with one of the README methods, for example curl -fsSL https://claude.ai/install.sh | bash on macOS or Linux.
  2. Navigate to your project directory.
  3. Run claude.
  4. Ask in natural language to explain how a named module or feature works, and to list the files it depends on.
  5. Ask follow-up questions about any part that is still unclear.

Prompt for your agent

Use Claude Code in the anthropics/claude-code-style workflow: open the project at <project-path> in the terminal, run `claude`, and ask it to explain how <module-or-feature> works, including the files it depends on. Expected output: a short written explanation naming those files. Verify by opening one named file and confirming the described function or flow appears there.

Caveat. The README says feedback collected through the /bug command can include conversation data, so avoid putting secrets or private code in a session you plan to report.

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