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init

Analyze a codebase and create a CLAUDE.md guide for future Claude Code sessions. Capture build and test commands, explain the overall architecture, and incorporate relevant information from existing documentation and development rules.

OriginalShow the original description

Initialize a new CLAUDE.md file with codebase documentation

Run score Not tested

See how to install

Good for

  • Create a CLAUDE.md guide for a codebase
  • Document build, lint, and test commands
  • Explain the overall code architecture
  • Review and improve an existing CLAUDE.md

Overview

What it does

This skill examines a codebase and creates a CLAUDE.md file to guide future Claude Code sessions in that project. It collects commonly used commands, including building, running static checks, running tests, and executing a single test. It also explains the overall architecture and structure, focusing on relationships that are difficult to understand without reading several files.

When it helps

Use it when starting work on an existing project with Claude Code or leaving development information for the next session. It brings in important details from README.md and Cursor or Copilot rules. If a CLAUDE.md already exists, it suggests improvements. The guide avoids simple file inventories and lists of generic development advice.

Example requests

  • “Examine this codebase and create a CLAUDE.md.”
  • “Summarize the development commands and overall architecture.”
  • “Suggest improvements to the existing CLAUDE.md.”

Notes

The output is a guidance file for Claude Code. If Codex or Gemini CLI settings are found, the skill explains a separate import process. This process does not involve reading those settings immediately or writing them directly into Claude Code settings.

This overview was written by AI (OpenAI Codex) from the public SKILL.md. Check the original below for the exact behavior.

Document check

AI checked the SKILL.md for operations that need care and for setup requirements. The score comes only from actually running the skill (hands-on test).

SafetyAre sending data, deleting files, and running commands disclosed?
AGoodIt forbids reading other agents’ settings directly and requires an explicit selection after scanning before import.
Easy setupDoes it need few tools or API keys, and are they documented?
AGoodNo additional tools are specified for normal creation, and an alternative command is provided when import is unavailable.

Not counted in the score. Rated by AI (OpenAI Codex) as of Oct 24, 2026. Treat it as a guide and read the original before installing.

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Files included (1)

  • SKILL.md2.4 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Please analyze this codebase and create a CLAUDE.md file, which will be given to future instances of Claude Code to operate in this repository.

What to add:

  1. Commands that will be commonly used, such as how to build, lint, and run tests. Include the necessary commands to develop in this codebase, such as how to run a single test.
  2. High-level code architecture and structure so that future instances can be productive more quickly. Focus on the "big picture" architecture that requires reading multiple files to understand.

Usage notes:

  • If there's already a CLAUDE.md, suggest improvements to it.
  • When you make the initial CLAUDE.md, do not repeat yourself and do not include obvious instructions like "Provide helpful error messages to users", "Write unit tests for all new utilities", "Never include sensitive information (API keys, tokens) in code or commits".
  • Avoid listing every component or file structure that can be easily discovered.
  • Don't include generic development practices.
  • If there are Cursor rules (in .cursor/rules/ or .cursorrules) or Copilot rules (in .github/copilot-instructions.md), make sure to include the important parts.
  • If there is a README.md, make sure to include the important parts.
  • If you find an OpenAI Codex config (/.codex/config.toml or ./.codex/) or a Gemini CLI config (/.gemini/settings.json or ./.gemini/ or a GEMINI.md), offer to import it now — tell the user to reply /import to scan and list what's importable (MCP servers, slash commands, subagents, skills, instructions), then /import --yes=<digest> (the scan output names the digest) to apply the user-level items. Do NOT read the foreign-agent config files or write Claude Code config yourself — the deterministic import (triggered by --yes) applies the same safe-name and path-traversal guards as the terminal picker. If /import isn't available on this surface, tell the user to run claude import from a terminal instead.
  • Do not make up information such as "Common Development Tasks", "Tips for Development", "Support and Documentation" unless this is expressly included in other files that you read.
  • Be sure to prefix the file with the following text:
# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

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