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/art9mid/arc-skill/claude-mdgit clone --depth 1 https://github.com/art9mid/arc-skillWrote 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.
[](https://agentmods.dev/instructions/art9mid/arc-skill/claude-md)<a href="https://agentmods.dev/instructions/art9mid/arc-skill/claude-md"><img src="https://agentmods.dev/badge/instructions/art9mid/arc-skill/claude-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00150 | $0.00150 |
| Opus 5 | $0.00075 | $0.00075 |
| Sonnet 5 | $0.00030 | $0.00030 |
| Haiku 4.5 | $0.00015 | $0.00015 |
Grade A, and why
arc-skill 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 4d 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 4d ago First seen · 15 lines · 150 tokens per session scan A cb342121f277
arc-skill CLAUDE.md is an instructions file published in the GitHub repository art9mid/arc-skill (7 stars, last pushed 4mo ago), with no licence file. It adds 150 tokens to every session, about $0.0007 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
flutter_enterprise_starter_kit CLAUDE.md
Instructions for nicolinx/flutter_enterprise_starter_kit, covering claude.md, start here, commands and non-negotiables.
expo_boilerplate CLAUDE.md
Claude Code instructions for chohra-med/expo_boilerplate, covering claude.md — mobilelauncher lt, 🌿 branches — the trunk is development, there is no main, project skill, what this project is and the master rules.
expo_boilerplate AGENTS.md
AGENTS.md instructions for chohra-med/expo_boilerplate, covering agents.md — mobilelauncher lt, project and 🎯 the master rules location.
apple-dev-skills AGENTS.md
AGENTS.md instructions for markdavidgan/apple-dev-skills, covering apple dev skills — agent guide (codex / kimi / cross-cli), quick reference, repository rules, project-local consumer convention and checkpoint compaction protocol.
mobile-ai-agents CLAUDE.md
Claude Code instructions for salmanashraf/mobile-ai-agents, covering claude.md — mobile ai agents, what this repo is, quick start, install everything and install by platform.
figma-ios-codegen AGENTS.md
Instructions for mythkiven/figma-ios-codegen, covering project agent rules, 必读规则文件, 何时启用本流程, 铁律（最高优先级） and 架构（1 → 2 → 4；阶段 3 仓外）.