I built a free Claude Code toolkit — 64 skills, 7 agents, 16 slash commands, and auto-formatting hooks for the full engineering stack

Been using Claude Code daily and kept running into the same gap Claude knows the basics but misses the non-obvious patterns. So I built claude-spellbook, a toolkit you install once and Claude just knows these things. Repo: [https://github.com/kid-sid/claude-spellbook](https://github.com/kid-sid/claude-spellbook) Here's what's in it: 50 Skills, auto-activate when you're working on the relevant task Every skill has a Red Flags section (7-10 anti-patterns with explanations) and a pre-ship checklist. The kind of stuff you only learn by breaking production. 7 Autonomous Agents Subagents that run in their own context window with scoped tool access: 11 Slash Commands, prompt templates you invoke with / (e.g /mem\_save) Auto-formatting hooks — wired into settings.json Every file Claude writes or edits gets auto-formatted instantly: \- .ts / .svelte → prettier + eslint --fix \- .py → black + ruff check --fix \- .go → gofmt + golangci-lint \- .rs → rustfmt + cargo clippy \- .md → markdownlint --fix \- skills/\*/skill.md → custom format validator (checks frontmatter, ## When to Activate, ## Checklist) Install: \# Skills cp -r skills/\* \~/.claude/skills/ \# Agents cp .claude/agents/\* \~/.claude/agents/ \# Slash commands cp .claude/commands/\* \~/.claude/commands/ Skills activate automatically. No manual invocation needed. PRs welcome, especially skills for domains I haven't covered yet. Repo: [https://github.com/kid-sid/claude-spellbook](https://github.com/kid-sid/claude-spellbook) Share if you like it 😊 Let me know if there is something that should be fixed!