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agent-skills: Instructions file for Claude Code

CLAUDE.md

agent-skills CLAUDE.md is an instructions file for Claude Code from chriscox/agent-skills. It costs 1,200 tokens per session, scanned A, original, MIT.

Repository instructions for a collection of reusable skills for AI coding agents such as Claude Code, Codex, Gemini CLI, and OpenClaw. They explain the repository layout, plugin marketplace, and conventions for skill folders.

In plain words
What is it for?
Use them when creating or updating skills, changing marketplace entries, or working in a repository that supports both standalone skills and Claude Code plugins.
Why use it?
They help an agent understand where skills and plugin metadata belong and how the repository is organized.

Instructions file for Claude Code

Written for Claude Code: Claude Code plugin machinery. Also seen: mentions .claude-plugin; mentions CLAUDE.md; mentions Claude Code.

This is chriscox/agent-skills's own configuration. It tells Claude Code how to work on agent-skills itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything agent-skills configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is │ └── skills/<skill-name> → # Symlink to ../../skills/<skill-name>.

not rated 11repo 7mo ago A scan 1,200 tokens original MIT
View source ↗ chriscox/agent-skills
Reuse

Borrowing it

Nothing to install: this file belongs to chriscox/agent-skills. 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/chriscox/agent-skills/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/chriscox/agent-skills

Made for: Claude Code.

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Per session 1,200 This file is loaded in full into every session.
When invoked 1,200 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01200 $0.01200
Opus 5.5 $0.00480 $0.00480
Sonnet 5.5 $0.00240 $0.00240
Haiku 4.5 $0.00120 $0.00120

Measured 2mo ago against content hash 3276e38a15fe, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-skills 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 2mo 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 · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Instructions for AI agents working on this repository.

What This Repo Is

A collection of reusable skills for AI coding agents (Claude Code, Codex, Gemini CLI, OpenClaw). Each skill is a self-contained folder under skills/ with a SKILL.md and optional supporting files.

Repo Structure

This repo is a Claude Code plugin marketplace and a standalone skill collection.

agent-skills/
├── .claude-plugin/
│   └── marketplace.json               # Marketplace catalog (chriscox-skills)
├── skills/                             # Canonical skill content (single source of truth)
│   └── <skill-name>/
│       ├── SKILL.md                   # Required: frontmatter + instructions
│       ├── <skill-name>.yml           # Optional: config template for per-repo overrides
│       ├── issue-templates/           # Optional: GitHub issue form templates
│       └── templates/                 # Optional: doc scaffolding templates
├── plugins/                            # Claude Code marketplace wrappers
│   └── <skill-name>/
│       ├── .claude-plugin/plugin.json # Per-plugin manifest
│       └── skills/<skill-name> →      # Symlink to ../../skills/<skill-name>
├── skills.json                        # Machine-readable skill index (keep in sync)
└── install.sh                         # Multi-platform installer (Codex, Gemini CLI, OpenClaw)

Marketplace vs Standalone

  • As a marketplace (Claude Code): users add with /plugin marketplace add chriscox/agent-skills, then install individual plugins with /plugin install <name>@chriscox-skills. Plugins use symlinks to the canonical skills/ directory; Claude Code follows symlinks during copy.
  • As standalone skills (Codex, Gemini CLI, OpenClaw): install via install.sh, native installer (gemini skills install), or manual copy. Uses skills/ directly.

Conventions

Adding a New Skill

  1. Create skills/<skill-name>/SKILL.md with proper frontmatter (name + description)
  2. If the skill has per-repo config, add <skill-name>.yml at the skill root
  3. If the skill provides GitHub issue templates, add them to issue-templates/
  4. If the skill provides doc templates, add them to templates/
  5. Create the marketplace plugin wrapper:
    • plugins/<skill-name>/.claude-plugin/plugin.json — manifest with "skills": "./skills/"
    • plugins/<skill-name>/skills/<skill-name> — symlink to ../../../skills/<skill-name>
  6. Add the plugin to .claude-plugin/marketplace.json with name, source, and description
  7. Update skills.json with the new skill entry
  8. Update the README.md:
    • Add to the skills table of contents
    • Add a full section with: problem, what it does, prerequisites, config, example
    • Update the skills count badge
  9. Test with ./install.sh list, ./install.sh skill <name>, and ./install.sh templates <name>

Read the full file on GitHub · 122 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.

  1. 2mo ago First seen · 122 lines · 1,200 tokens per session scan A 3276e38a15fe

Subscribe to this mod's changes

agent-skills CLAUDE.md is an instructions file published in the GitHub repository chriscox/agent-skills (11 stars, last pushed 7mo ago), licensed MIT. It adds 1,200 tokens to every session, about $0.0048 per session on Opus 5.5. 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.

Claude Codeai-coding-agentai-skillscodexdeveloper-toolsgemini-cli
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