Claude Code Mastery

Expert skill for Claude Code CLI -- CLAUDE.md optimization, skill authoring, subagent creation, hooks automation, and context engineering.

Keywords: claude-code, claude-cli, CLAUDE.md, skill-authoring, subagents, hooks, context-window, token-budget, MCP-servers, worktrees, permission-modes, prompt-engineering, context-engineering, slash-commands

Core Capabilities

• CLAUDE.md optimization — audit, restructure, compress, and hierarchize config files for token efficiency.
• Skill authoring — scaffold and write discoverable skill packages with correct layout and frontmatter.
• Subagent creation — write .claude/agents/<name>.md files with a tools allowlist and a Markdown-body system prompt.
• Hooks automation — wire PreToolUse/PostToolUse/Stop lifecycle scripts via .claude/settings.json.
• Context engineering — measure and manage the context-window token budget across a codebase.

When to Use

• Authoring, structuring, or optimizing a CLAUDE.md file for any project.
• Scaffolding a new skill package or creating a Claude Code subagent.
• Configuring hooks for automated quality, security, or workflow steps.
• Auditing and reducing context-window consumption.