skilldeck

A command-line manager for installing, updating, deleting, and assigning Skills to AI coding agents. Skills are folders containing a SKILL.md file and optionally other files such as scripts or templates.

In plain words
What is it for?
It is for managing Skills used by agents such as Claude Code, Codex, Gemini CLI, Copilot CLI, and OpenCode on macOS.
Why use it?
It avoids manually copying and organizing Skill folders across different coding-agent tools. It keeps the shared Skill storage and agent-specific links in the expected locations.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/crossoverjie/skilldeck/skilldeck
Any agent
npx skills add crossoverJie/SkillDeck --skill skilldeck
Clone the repo
git clone --depth 1 https://github.com/crossoverJie/SkillDeck

Made for: Claude Code, Codex.

Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,008 The whole file, excluding the scripts and references it only reads on demand.
Security scan E 3 findings. Scan, not verified.
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 $0.00029 $0.06008
Opus 5 $0.00015 $0.03004
Sonnet 5 $0.00006 $0.01202
Haiku 4.5 $0.00003 $0.00601

Measured 2d ago against content hash b9ea96bc93f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade E, and why

skilldeck scanned grade E with 3 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl -s "https://skills.sh/api/search?q=your-query" | python3 -m json.tool

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf "$TMPDIR"

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s "https://skills.sh/api/search?q=your-query" | python3 -m json.tool
skills/skilldeck/SKILL.md · 645 lines

How it starts

The opening of the file, as written. The whole thing — 645 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SkillDeck Manager

Manage AI coding agent skills through natural language. This skill teaches you how to install, update, delete, and assign skills using SkillDeck's filesystem conventions.

SkillDeck is a macOS GUI app that manages skills across 14 AI agents. Skills are stored as directories containing SKILL.md files. This skill lets you perform the same operations from the terminal.

Filesystem Layout

~/.agents/
├── skills/                    # Canonical storage (real files live here)
│   ├── my-skill/
│   │   ├── SKILL.md           # Skill definition (YAML frontmatter + markdown)
│   │   └── ...                # Other files (scripts, templates, etc.)
│   └── another-skill/
│       └── SKILL.md
├── .skill-lock.json           # Lock file (v3, shared with npx skills)
└── .skilldeck-cache.json      # SkillDeck's private cache (do not modify)

~/.claude/skills/              # Claude Code skills (symlinks → canonical)
~/.codex/skills/               # Codex skills (symlinks → canonical, also reads ~/.agents/skills/)
~/.gemini/skills/              # Gemini CLI skills
~/.copilot/skills/             # Copilot CLI skills (also reads ~/.claude/skills/)
~/.config/opencode/skills/     # OpenCode skills (also reads ~/.claude/skills/ and ~/.agents/skills/)
~/.cursor/skills/              # Cursor skills (also reads ~/.claude/skills/)
~/.kiro/skills/                # Kiro skills
~/.codebuddy/skills/           # CodeBuddy skills
~/.openclaw/skills/            # OpenClaw skills
~/.trae/skills/                # Trae skills
~/.qoder/skills/               # Qoder skills
~/.qclaw/skills/               # QClaw skills
~/.workbuddy/skills/           # WorkBuddy skills
~/.gemini/antigravity/skills/  # Antigravity skills

Key rules:

  • The real copy of every skill lives in ~/.agents/skills/<name>/
  • Each agent gets a symlink pointing to the canonical directory
  • Example: ~/.claude/skills/my-skill~/.agents/skills/my-skill
  • Some agents can read other agents' directories (cross-directory inheritance):
    • Codex reads ~/.agents/skills/ natively (no symlink needed)
    • Copilot reads ~/.claude/skills/
    • OpenCode reads ~/.claude/skills/ and ~/.agents/skills/
    • Cursor reads ~/.claude/skills/

Read the full file on GitHub · 645 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. 2d ago First seen · 645 lines · 29 tokens per session scan E b9ea96bc93f7

Subscribe to this mod's changes

skilldeck is a skill published in the GitHub repository crossoverJie/SkillDeck (552 stars, last pushed 1mo ago), licensed MIT. It adds 29 tokens to every session and 6,008 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it E with 3 findings (downloads and executes remote code, recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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