Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/kid-sid/codex-spellbook/spellbook-setupnpx skills add kid-sid/codex-spellbook --skill spellbook-setupgit clone --depth 1 https://github.com/kid-sid/codex-spellbookWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00053 | $0.02392 |
| Opus 5 | $0.00026 | $0.01196 |
| Sonnet 5 | $0.00011 | $0.00478 |
| Haiku 4.5 | $0.00005 | $0.00239 |
Grade C, and why
spellbook-setup scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
cat ~/.claude/settings.json # look for "hooks" key Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
ls ~/.claude/skills/ # global How it starts
The opening of the file, as written. The whole thing — 281 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Spellbook Setup
Install and configure claude-spellbook — globally (all projects) or scoped to one project.
When to Activate
- Installing claude-spellbook on a new machine or for a new user
- Deciding between global and project-level skill/agent install
- Setting up the memory_map MCP server for persistent memory
- Enabling auto-format, safety, and history hooks in
settings.json - Adding spellbook skills/commands to a single project without touching global config
- Verifying or repairing an existing spellbook install
Prerequisites
| Requirement | Check |
|---|---|
| Claude Code CLI | claude --version |
| Git | git --version |
| Python 3.9+ (for memory_map) | python --version or python3 --version |
Clone the Repo
git clone https://github.com/kid-sid/claude-spellbook.git
cd claude-spellbook
Global Install (Recommended)
Global install puts skills, agents, and commands into ~/.claude/ so they are available in every project without any per-project steps.
Step 1 — Skills
# All skills (recommended — they activate on-demand, no overhead)
cp -r skills/* ~/.claude/skills/
# Single skill
cp -r skills/security ~/.claude/skills/
Step 2 — Agents
cp -r .claude/agents/* ~/.claude/agents/
Step 3 — Slash Commands
cp -r .claude/commands/* ~/.claude/commands/
Step 4 — memory_map MCP Server
# Clone and install
git clone https://github.com/kid-sid/memory_map.git
cd memory_map
# Windows
python -m venv venv
venv\Scripts\pip install -r requirements.txt
# Mac/Linux
python3 -m venv venv
source venv/bin/activate && pip install -r requirements.txt
# Register globally (substitute your actual username)
# Windows
claude mcp add -s user memory_map C:/Users/yourname/memory_map/venv/Scripts/python.exe C:/Users/yourname/memory_map/server.py
# Mac/Linux
claude mcp add -s user memory_map python3 /home/yourname/memory_map/server.py
Verify registration:
claude mcp list
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 281 lines · 53 tokens per session scan C 73a1cbdd35fc
spellbook-setup is a skill published in the GitHub repository kid-sid/codex-spellbook (21 stars, last pushed 3mo ago), licensed MIT. It adds 53 tokens to every session and 2,392 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (reads agent configuration directories, enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
brainstorming
You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior. Explores user intent, requirements and design before implementation.
auto-perf-optimize
Run agent-driven VS Code performance or memory investigations. Use when asked to launch Code OSS, automate a VS Code scenario, run the Chat memory smoke runner, capture renderer heap snapshots, take workflow screenshots, compare run summaries, or drive a repeatable scenario before heap-snapshot analysis.
chat-perf
Run chat perf benchmarks and memory leak checks against the local dev build or any published VS Code version. Use when investigating chat rendering regressions, validating perf-sensitive changes to chat UI, or checking for memory leaks in the chat response pipeline.
chat-pet-sprite-creation
Use when creating or changing VS Code chat pet sprite art, sprite sheets, state animations, eye treatments, Stable/Insiders variants, or pet transitions under src/vs/workbench/contrib/chat/browser/widget/media/chatPet.
cpu-profile-analysis
Analyze V8/Chrome CPU profiles (.cpuprofile) and DevTools trace files (Trace-.json). Use when: profiling performance, investigating slow functions, comparing code paths, finding bottlenecks, analyzing timeToRequest, understanding call trees from sampling profiler data, analyzing layout/paint/rendering, investigating…