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 instructions/sjquant/skul/claude-mdgit clone --depth 1 https://github.com/sjquant/skulWhat 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 | $0.00243 | $0.00243 |
| Opus 5 | $0.00121 | $0.00121 |
| Sonnet 5 | $0.00049 | $0.00049 |
| Haiku 4.5 | $0.00024 | $0.00024 |
Grade A, and why
skul 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 2d 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.
What it actually says
Overview
Skul is a TypeScript CLI for managing project-scoped AI configuration bundles across multiple tools (Claude Code, Cursor, Codex, OpenCode). It handles bundle discovery, materialization, registry tracking, stealth mode, and cross-tool translation.
Note: This CLI has not been shipped yet.
Commands
Run pnpm install first — this installs dependencies and sets up the prek pre-commit hooks.
pnpm test # run tests once
pnpm run typecheck # type-check without emitting
pnpm run build # compile to dist/
pnpm run dev # run CLI via tsx
CI checks
These three commands must pass before pushing — they're what .github/workflows/ci.yml runs:
pnpm run check:ci # biome lint + format check (no autofix)
pnpm run typecheck # tsc --noEmit
pnpm run test:coverage # vitest run --coverage
To autofix lint and formatting issues locally before re-running check:ci, use pnpm run check (which runs biome check --write .).
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.
- 2d ago First seen · 29 lines · 243 tokens per session scan A d74eda89b06a
skul CLAUDE.md is an instructions file published in the GitHub repository sjquant/skul (2 stars, last pushed 4d ago), licensed ISC. It adds 243 tokens to every session, about $0.0012 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 2026-08-31.
Other instructions, from other repositories
rk-skills CLAUDE.md
Instructions for richkuo/rk-skills, covering global guidelines, integrity — top priority, overrides every rule below, response style (every response), who you're working with and package manager.
agentsmith AGENTS.md
AGENTS.md instructions for Sarthib7/agentsmith, covering repository instructions, skill ownership, yagni, generated files and plugin work.
rk-skills AGENTS.md
Instructions for richkuo/rk-skills, a project described as: Claude Code workflow skills — GitHub issue/PR/release automation and Fable-driven planning. Install via npx or as a Claude Code plugin.
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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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.