spellbook: Cross-runtime skills for Claude Code, Codex, and multi-agent workflows

by majiayu000 · Claude Skill · ★ 290

Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h

Featured in: Claude Code Skills

How to install spellbook

git clone https://github.com/majiayu000/spellbook.git

Taken from the project's README on GitHub.

Security audit verdict: SAFE · quality 72/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours.

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

agent-skillsai-agent-skillsai-agentsai-coding-assistantautomationclaudeclaude-codeclaude-code-skillscode-reviewcodex

Quick Facts

Stars290
Forks28
LanguagePython
CategoryClaude Skill
LicenseMIT
Quality Score72/100
Open Issues1
Last Updated2026-11-02
Created2025-12-09
Platformsclaude-code, codex, python
Est. Tokens~17k

About spellbook

Spellbook 82 Cross-Runtime Skills One Command Install A cross-runtime skill library for Claude Code, Codex, and multi-agent workflows. Quick Start • Runtime Targets • Pick a Workflow • Skills • Agents • Changelog • Release Status • Contributing • 中文 Rename notice: Spellbook was formerly Claude Arsenal.

Compatible Skills

These tools work well together with spellbook for enhanced workflows:

  • vexjoy-agent — semantic(0.32)+complementary+same_lang+similar_pop+shared_platform (61%)
  • agent-skills — semantic(0.31)+complementary+same_lang+similar_pop+shared_platform (61%)
  • ai-agent-skill-for-video-workflow — semantic(0.31)+complementary+rare_topics+same_lang+similar_pop+shared_platform (60%)

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

View on GitHub → Browse Claude Skill tools