What is claude-spellbook CLAUDE.md?

Repository instructions for Claude Code, including required session setup, project layout, development commands, and configuration installation. They also describe using a memory service to load and save context between sessions.

Use them to set up Claude Code sessions, explain repository conventions, run development tasks, and install the project's tools in another project.

They give the coding agent consistent project context and rules, reducing repeated exploration and lost knowledge between sessions.

How kid-sid/claude-spellbook configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to kid-sid/claude-spellbook. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/kid-sid/claude-spellbook/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/kid-sid/claude-spellbook

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/kid-sid/claude-spellbook/claude-md.svg)](https://agentmods.dev/instructions/kid-sid/claude-spellbook/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/kid-sid/claude-spellbook/claude-md"><img src="https://agentmods.dev/badge/instructions/kid-sid/claude-spellbook/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,442 This file is loaded in full into every session.

When invoked 1,442 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What 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 5.1	$0.01442	$0.01442
Opus 5	$0.00721	$0.00721
Sonnet 5	$0.00288	$0.00288
Haiku 4.5	$0.00144	$0.00144

Measured 7d ago against content hash b9ba70a4fc20, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

claude-spellbook CLAUDE.md scanned grade A with 0 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 7d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 149 lines

How it starts

The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Session Setup (Required)

At the start of every session, before doing anything else:

Call load_memory with the current working directory
Call suggest_history with the current working directory and the user's first message
Read both outputs — they contain saved context and the most relevant conversation history
Do not explore files or ask clarifying questions that memory already answers

The load_memory / suggest_history / save_memory tools come from the memory_map MCP server. Install via pip install "memory-map-mcp[embed-openai]" — see the MCP Server section in README.md for full setup (MongoDB, env vars, hooks). Upstream: github.com/kid-sid/memory_map.

Save or update memory entries whenever you learn something worth keeping across sessions. If something loaded from memory is no longer accurate, update it with save_memory using the same key. Use short, lowercase keys: stack, current_work, gotchas, key_files, etc. Keep values concise — one or two sentences max.

Repository Layout

skills/<skill-name>/skill.md     — skill reference files (install to ~/.claude/skills/)
.claude/agents/<name>.md         — autonomous subagents (install to ~/.claude/agents/)
.claude/commands/<name>.md       — slash commands (install to ~/.claude/commands/)
.claude/hooks/<name>.js          — PostToolUse/PreToolUse hook scripts (install to project .claude/hooks/)
tools/<lang>/                    — drop-in linter/formatter configs for 6 languages
templates/                       — scaffold starters

Development Commands

make install      # Install Node + Python linting tools locally (copies from tools/ into root)
make check        # Check which linting tools are available on your PATH
make format       # Run prettier over all skill markdown files
make lint         # Run markdownlint over all skill markdown files
make help         # List all make targets

# Install tool configs into another project
make setup TARGET=/path/to/project LANG=typescript
bash tools/install.sh python --target /path/to/project

Read the full file on GitHub · 149 lines

Changes

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.

7d ago First seen · 149 lines · 1,442 tokens per session scan A b9ba70a4fc20

Subscribe to this mod's changes

claude-spellbook CLAUDE.md is an instructions file published in the GitHub repository kid-sid/claude-spellbook (188 stars, last pushed 1mo ago), licensed MIT. It adds 1,442 tokens to every session, about $0.0072 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,182 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

claude-spellbook: Instructions file for Claude Code