Claude Code is Anthropic’s official CLI for Claude. It can be extended with skills — reusable slash commands that give Claude structured workflows for common tasks like debugging, testing, code review, and more.
Installing Skills
Skills are installed via npx skills. The -g flag installs them globally (available in all projects) and -y auto-confirms.
Sequential Thinking
Systematic step-by-step reasoning with the ability to revise and branch thoughts.
1 | npx skills add mrgoonie/claudekit-skills@sequential-thinking -g -y |
Invoke with: /sequential-thinking
Superpowers Bundle (14 skills)
A curated bundle covering the most common development workflows.
1 | npx skills add obra/superpowers -g -y |
Context7 — Live Library Documentation
Fetches up-to-date documentation for libraries and frameworks in real time.
1 | # Install the skill |
Invoke with: /context7
PM Skills
Open-source library of 1,098 professional agent skills (markdown-based) spanning business domains (PRDs, postmortems) and everyday tasks (lease decoding, salary negotiation). Works with Claude, ChatGPT, Gemini, Cursor and Codex; no lock-in since skills are just text files.
1 | npx pm-claude-skills add |
Or install via /plugin inside Claude Code and search for pm-skills.
Security Audit
Cloudflare’s security-audit skill turns the agent into a security auditor: reconnaissance, coverage-led hunting, candidate validation, and independently verified findings, written out as REPORT.md / FINDINGS-DETAIL.md.
1 | npx skills add https://github.com/cloudflare/security-audit-skill --skill security-audit -g -y |
Trigger it with a prompt like security audit this codebase.
Official Claude Plugin
Code Simplifier
Reviews changed code for reuse, quality, and efficiency, then fixes issues found.
1 | claude plugin install code-simplifier |
Invoke with: /simplify
MCP Plugins
Context Mode — Reduce Context Window Usage
Context Mode is an MCP server that sandboxes tool output (98% reduction — a 315 KB session becomes 5.4 KB) and persists session memory across context compactions, so Claude doesn’t forget which files it was editing.
1 | /plugin marketplace add mksglu/context-mode |
Verify with /context-mode:ctx-doctor, check savings with /context-mode:ctx-stats.
Engram — Persistent Memory
Engram is a self-hosted, open-source memory server (Apache 2.0): it extracts facts, preferences, and decisions from conversations, consolidates them nightly, and recalls them across sessions and even across different models (Claude, ChatGPT, Gemini).
1 | # MCP server for Claude Desktop, Cursor, Windsurf, and any MCP client |
Runs entirely on your machine — no cloud account required; used via engram.remember(...) / engram.recall(...).
Quick Reference — All Skills
| Skill | Command |
|---|---|
| Sequential Thinking | /sequential-thinking |
| Brainstorming | /brainstorming |
| Writing Plans | /writing-plans |
| Executing Plans | /executing-plans |
| Test-Driven Development | /test-driven-development |
| Systematic Debugging | /systematic-debugging |
| Subagent Development | /subagent-driven-development |
| Parallel Agents | /dispatching-parallel-agents |
| Git Worktrees | /using-git-worktrees |
| Verification | /verification-before-completion |
| Code Review (request) | /requesting-code-review |
| Code Review (receive) | /receiving-code-review |
| Finish Branch | /finishing-a-development-branch |
| Context7 Docs | /context7 |
| Security Audit | prompt: “security audit this codebase” |
| Code Simplifier | /simplify |
| Context Mode | /context-mode:ctx-stats |
| Engram Memory | MCP tools: remember / recall |
Extra Tools
markitdown — Document Reader
Converts files (PDF, Word, PowerPoint, Excel, HTML, CSV, JSON, Images, Audio, YouTube URLs, EPubs, ZIP) to Markdown so Claude can read them.
1 | pipx install 'markitdown[all]' |
Usage inside a Claude Code session:
1 | markitdown path/to/file.pdf |